Mechanical Behavior of Materials Committee

Technical Programming

2018 TMS Annual Meeting & Exhibition: Additive Manufacturing: Building the Pathway towards Process and Material Qualification: Organized by John Carpenter; Allison Beese; David Bourell; Christian Leinenbach; James Sears; Christopher Tuck

This symposium will provide a forum for all veins of additive manufacturing to present their latest results in developing methodology for science-based or practice-based material and process qualification. Sessions will be included that seek to develop processing-microstructure-property- performance relationships in metals and non-metals alike. Experimental, modeling, and combined experimental/modeling approaches are welcome. Background and Rationale: Additive manufacturing (AM) offers distinct advantages over conventional manufacturing processes including the capability to both build and repair complex part shapes; to integrate and consolidate parts and thus overcome joining concerns; and to locally tailor material compositions as well as properties. A variety of fields such as aerospace, military, automotive, and biomedical are employing this manufacturing technique as a way to decrease costs, increase manufacturing agility, and explore novel geometry/functionalities. To increase acceptance of AM as a viable processing method, pathways for qualifying both the material and the process need to be developed and, perhaps, standardized. This symposium will serve as a venue for the international AM community - including government, academia, and industry - to define the fundamental interrelationships between feedstock, processing, microstructure, shape, mechanical behavior/materials properties, and function/performance. This will be accomplished through experimental observations, theoretical advances, and computational modeling of physical processes to provide insight and understanding of the nature of the final product and the evolution of microstructure resulting in final part properties and performance. Materials of interest include but are not limited to: - Homogeneous materials: polymers, ceramics, and metals - Heterogeneous materials: foams, polymeric matrix, metallic matrix, ceramic matrix, functionally graded Areas of interest include, but are not limited to: - Fabrication: * Machines: emerging technologies and advancing current capabilities * Processing: feedstock material (including powder, wire, and filament), process and process monitoring (both freeform and direct write), build parameters, repair parameters, post processing (e.g., heat treatment) * Specimen design: net-shaped parts; parts machined to shape based on scaling; as built laboratory test specimens/coupons; specimens/coupons machined from larger builds - Developing constitutive relationships: coupling microstructure measurements and experimental stress analysis to characterize mechanical behavior/materials properties targeting performance - Closing the feedback loop: microstructure measurements feedback to fabrication; performance (mechanical behavior, materials properties, and/or functional) feedback to fabrication

2018 TMS Annual Meeting & Exhibition: Bulk Metallic Glasses XV: Organized by Peter Liaw; Hahn Choo; Yanfei Gao; Yunfeng Shi; Xie Xie; Gongyao Wang; Jianzhong Jiang; Robert Maass

Provide fundamental understanding and theoretical modeling of processing and mechanical behavior of bulk metallic glasses (BMGs). In the last decade, new approaches to fabricating metallic glasses [i.e., by utilizing unique combinations of elements to form metallic-glass alloys] have resulted in the required cooling rate dropping from 105 C/s to as low as 1 C/s, and the specimen size increasing from 0.05 mm to as large as 80 mm. Because of the large sizes possible with this exciting technology, the metallic glasses are called BMGs. Mechanical behavior of BMGs is among the new, exciting fields of research that are fully illustrating their advantages over crystalline alloys. Generally, BMGs have higher fracture strengths, fracture toughnesses, and elasticities than their crystalline counterparts. There is great interest in BMGs for use in biomedical, structural, and mechanical applications. Some of the areas to be explored: (1) Material fabrication and processing (2) Nanocrystalline materials and composites (3) Mechanical behavior (4) Shear band formation, fatigue, deformation, and fracture mechanisms (5) Corrosion, physical, magnetic, electric, thermal, and biomedical behavior (6) Theoretical modeling and simulation (7) Industrial applications

2018 TMS Annual Meeting & Exhibition: Coupling Experiments and Modeling to Understand Plasticity and Failure: Organized by Michael Sangid; Philip Eisenlohr; Matthew Miller; Paul Shade

This symposium celebrates new discoveries and advances in the exploration of the mechanical behavior of polycrystalline metals and alloys, while emphasizing a strong coupling between experiments and modeling approaches to address these problems. The deformation of solids – even under nominally “uniform” loading conditions - often involves gradients, due to various heterogeneities in the microstructure and anisotropic single crystal properties that govern mechanical behavior. Over the past decade, the application of advanced tools for the interrogation of materials at the mesoscale (aggregate of individual crystals) is revolutionizing mechanics. Concurrently, simulations have benefited from increased computational power, which enables the role of the microstructure in the mechanical behavior of solids to be captured and predicted with high accuracy and fidelity. The central theme of the symposium is a strong coupling between modeling and experiments; to accentuate this theme, we target research with the objective: (i) simultaneous modeling/experimental approaches, (ii) experiments that elucidate the need for specific models, (iii) modeling approaches to down-select the need for experimental testing, and (iv) modeling raw characterization data to reconstruct mechanical behavior. The research addressed in this symposium has direct implications in accelerating advanced materials discovery and deployment, in concurrence with the Materials Genome Initiative and Integrated Computational Materials Science and Engineering. The main topics of the symposium are as follows: - Individual and collective behavior of dislocations in dislocation mediated plasticity - Grain interactions, leading to evolution of intra- and inter-granular stress and orientation heterogeneities - Mesoscale performance response, including yield, strain hardening, fatigue, fracture, and creep The symposium will offer 3-4 half-day sessions, and each session will have a strong integration between experimentalists and modelers. An effort will be made to schedule adjacent talks for collaborators working on the same project, to show synergy amongst techniques. To supplement these efforts and to enhance student involvement, this symposium will also offer a poster session following this theme, integration of poster presentations within the main sessions, and a prize for best student poster.

2018 TMS Annual Meeting & Exhibition: Design for Mechanical Behavior of Architectured Materials via Topology Optimization: Organized by Natasha Vermaak; Andrew Gaynor

The architectured strategy for designing materials and structures introduces a scale for materials organization between the microstructure and the macroscopic shape. In this “meso-scale” regime, spatial heterogeneity is prescribed through arranging combinations of materials, or of materials and space, in configurations and with connectivities or topologies that target enhanced mechanical performance. Topology optimization offers a mathematical framework to determine the most efficient material layout for prescribed constraints and loading conditions, and often leads to significant light-weighting at the structural scale. Topology optimization also offers a framework for accessing unexplored and previously unachievable areas of material-property space. There is enormous potential to design meso-scale materials, in two and three dimensions, with controlled microarchitecture, topology, and new mechanical and multiphysics properties. For example, design approaches may include lattice structures or repeating unit cell homogenization. This symposium will feature leading strategies for using various topology optimization techniques in the design of the mechanical behavior of architectured materials. Potential topics of interest include: * Multi-objective and/or multiphysics optimization targeting extremal mechanical properties. * Optimization considering process parameter relations to architected material design. * Multi-scale design of hierarchical materials. * Optimization of functionally graded materials * Optimization under material and processing uncertainty

2018 TMS Annual Meeting & Exhibition: Dynamic Behavior of Materials VIII: Organized by Saryu Fensin; George Gray; Naresh Thadhani; Kenneth Vecchio; Marc Meyers

The dynamic behavior of materials encompasses a broad range of phenomena with technological applications in both the military and civilian sectors. Examples of such phenomena include deformation, fracture, fragmentation, shear localization, chemical reactions under extreme conditions, and processing (combustion synthesis; shock compaction; explosive welding and fabrication; shock and shear synthesis of novel materials). It is recognized today that materials aspects are of utmost importance in dynamic events. The macromechanical and physical processes that govern the phenomena manifest themselves, at the micro structural level, by a dazzling complexity of defect configurations and effects. Nevertheless, these processes/mechanisms can be quantitatively treated on the basis of accumulated knowledge. The advent of in-situ techniques available at facilities like NIF, MARIE, LCLS, Omega have enabled us to make significant strides towards gaining more insights into the basic mechanisms that drive materials response under dynamic loading. These coupled with modeling tools from continuum to ab-initio computations, enable realistic predictions of material performances and are starting to guide not only the design process but also our further micromechanical understanding of deformation processes at every level, including the basic dislocation mechanisms. In addition to tradition materials, we have also made progress in understanding the extreme response of emerging materials, such as nano-crystalline, BMGs, and high entropy alloys. Publication: None

2018 TMS Annual Meeting & Exhibition: Environmentally Assisted Cracking: Theory and Practice: Organized by Bai Cui; Raul Rebak; Sebastien Dryepondt; Srujan Rokkam

Environmentally assisted cracking (EAC) has become a significant limit for the lifetime of structural material components in harsh environments in many fields, such as the oil and natural gas industry, advanced nuclear power plants, and navy applications. The purpose of this symposium is to provide an international forum to foster the discussion of the critical problems in EAC and recent advances in both experiments and modelling. This symposium seeks technical presentations related to experimental and/or modeling studies of various types of EAC, such as hydrogen embrittlement, stress corrosion cracking, corrosion fatigue, and liquid metal embrittlement. The symposium will encompass, but not limited to, the following themes: - Models to understand EAC mechanisms and predict the lifetime of structural materials in harsh environments; - Experimental methods for the performance test of EAC in the laboratory and real environments; - Development of physics-based approaches or multiscale models for EAC monitoring and prognostics; - Fracture and fatigue of alloys in hydrogen environment; - Stress corrosion cracking of alloys in high-temperature water, seawater, or other environment; - Degradation of materials in liquid metal environment; - EAC in additively manufactured parts; - EAC in high-entropy alloys.

2018 TMS Annual Meeting & Exhibition: Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention: Organized by Ashley Spear; Jean-Briac le Graverend; Antonios Kontsos; Tongguang Zhai

This symposium features new discoveries and advances in the fields of materials fatigue and life prediction. It brings together research scientists and design engineers from all over the world to present their latest work on current issues in investigation and simulation of fatigue damage; identification of fatigue weak links; enhancement of fatigue strength and resistance; quantitative relationships among processing, microstructure, environment and fatigue properties; and life prediction. This symposium provides a platform for fostering new ideas about development of microstructure-based models to quantify the total life (including fatigue crack initiation and early growth) of a material.

2018 TMS Annual Meeting & Exhibition: Fracture: 65 Years after the Weibull Distribution and the Williams Singularity: Organized by Brad Boyce; Ellen Cerreta; Jacob Hochhalter; Jonathan Zimmerman

In 1951, Waloddi Weibull published a single-author paper describing a new statistical distribution “of wide applicability” in the Journal of Applied Mechanics. The very next year in the same journal, Max Williams published a single-author paper describing an analytic stress singularity that has become the foundation of linear elastic fracture mechanics. The Weibull distribution provides a stress-based method for assessing the statistics of failure whereas the Williams singularity provides a deterministic description of the stress field at a crack tip that drives fracture. While the two approaches are quite different, they both continue to be profoundly useful for engineering design. The symposium will focus on application of these methods to materials science, the limitations of these methods and nuance that has been unearthed after 65 years of use. How have these methods assisted in the development of improved engineering materials and more reliable engineered structures? What recent analysis methods for material failure might have a similar impact 65 years from now? Why is recent research not as readily adopted by broad engineering practice? What are the current generational challenges in fracture and material failure?

2018 TMS Annual Meeting & Exhibition: High Entropy Alloys VI: Organized by Peter Liaw; Michael Gao; Xie Xie; Gongyao Wang; E-Wen Huang; Tirumalai Srivatsan

This symposium will provide a new venue for presentation of research on the fundamental understanding and theoretical modeling of high-entropy alloy (HEA) processing, microstructures, and mechanical behavior. In contrast to conventional alloys, which are based upon one principal element, HEAs have multiple principal elements, often five or more. The significantly high entropy of the solid solution stabilizes the solid-solution phases in face-centered-cubic (FCC), body-centered-cubic (BCC), and hexagonal close-packed (HCP) structures against intermetallic compounds. Moreover, carefully-designed HEAs possess tailorable properties that far-surpass their conventional alloys. Such properties in HEAs include high strength, ductility, corrosion resistance, oxidation resistance, fatigue and wear resistance. These properties will undoubtedly make HEAs of interest for use in biomedical, structural, mechanical, and energy applications. Given the novel and exciting nature of HEAs, they are poised for significant growth, not unlike the bulk metallic glass or nanostructured alloy scientific communities, and present a perfect opportunity for a new symposium. Topics of interest include but not limited to: (1) Material fabrication and processing, such as homogenization, nanomaterials, and grain-boundary engineering (2) Advanced characterization, such as neutron scattering and three-dimensional (3D) atom probe (3) Thermodynamics and diffusivity: measurements and modeling (4) Mechanical behavior, such as fatigue, creep, and fracture (5) Corrosion, physical, magnetic, electric, thermal, coating, and biomedical behavior (6) Theoretical modeling and simulation using density functional theory, molecular dynamics, Monte Carlo simulations, phase-field and finite-elements method, and CALPHAD modeling (7) Industrial applications

2018 TMS Annual Meeting & Exhibition: Integrative Materials Design III: Performance and Sustainability: Organized by Diana A. Lados; Brad Boyce; Corbett Battaile; Anastasios Gavras

The challenges in modern materials design revolve around the successful integration of several important and sometimes competing concepts such as Performance and Reliability, Sustainability and Societal Impact, and Economics. The first category, Performance and Reliability, involves familiar but complex design requirements: strength/ductility; fatigue, fatigue crack growth, impact, and creep resistance; and high-temperature properties. In addition to these traditional design requirements, an increasingly important consideration in an environmentally conscious world is the Sustainability and Societal Impact of the materials/processes and end products. These “Fit- Function-Green” attributes are finally tempered by Economics, as the best material for a given application may not be economically feasible in terms of either raw materials and processing costs or recyclability. Sustainable material-process-component design and reduced energy consumption throughout the life-cycle require an increased use of recycled materials as well as recyclability of the end product, and necessitate simultaneous and compatible design and materials selection. The integration further continues within each of these main areas via consistent and connective multi-disciplinary and multi-scale approaches. This context generates fertile opportunities for the ingenious materials engineer to develop a holistic approach in which experimental, analytical, and computational knowledge is coupled with suitable and sustainable application-driven design and manufacturing strategies, ultimately leading to a final component with the right balance between performance, manufacturability, sustainability, and affordability. This symposium will address these aspects in the context of needs and developments, focusing on important factors that contribute to material-process-component design, performance, and sustainability. Prospective topics include (and are not limited to) fundamental developments and design considerations related to: (1) effects of traditional and novel bulk and surface processes on micro-/nano-structure evolution of materials (e.g. Cast and Wrought Alloy Processing, Additive Manufacturing, Cold Spray Technology, Gradient and Functional Materials Fabrication, Friction Stir Welding/Processing, Metal Matrix (nano)Composites, Shot/Laser-Shock/Ultrasonic/Cavitation Peening, Low Plasticity Burnishing, etc.), (2) multi-scale microstructural effects on the behavior of materials (i.e., static properties, fatigue, fatigue crack growth, thermo-mechanical fatigue, impact, high-temperature properties and creep) and their integration in design, (3) interfacial and residual stress effects (both surface and bulk – measurement, effects on properties and life, and design approaches), (4) advanced material/behavior characterization methods (e.g. DIC, EBSD, tomography, and other in-situ and ex-situ methods), (5) testing advances and non-destructive evaluation techniques for damage detection and monitoring, (6) advances in Integrated Computational Materials Engineering (ICME) related to microstructure and properties simulation and prediction, and (7) sustainable approaches to material-process-component design, life-cycle analyses, and recycling considerations. A student poster competition will be held; to be considered for this competition, select "Student Poster" as your presentation type below.

2018 TMS Annual Meeting & Exhibition: Mechanical Behavior at the Nanoscale IV: Organized by Christopher Weinberger; Qian Yu; Garritt Tucker; Nan Li; Yu Zou; Jonathan Zimmerman; Scott Mao

Understanding the mechanics of materials in small volumes is of fundamental importance because it simultaneously allows for the exploration of new properties at the smallest of length scales as well as provides a basis for understanding multiscale phenomena that originate at these lengthscales. This symposium will focus on the mechanical properties of small-volume and low-dimensional materials, as well as bulk materials that are comprised of or are aggregates of these materials including bulk nanostructured materials and nanoscale based heirarchical materials. Of particular interest are studies that discuss sample size effects, applications of nanoscale mechanical testing and the associated characterization, as well as modeling that addresses the mechanical properties of these materials. Properties of interest include, but are not limited to: elasticity, strength, plastic flow, fatigue, and fracture with material systems ranging from hard materials, including metals and ceramics, to soft and biological materials. Topics will include: - Size effects on elasticity, strength, plastic flow, fracture and fatigue in low dimensional materials including nanopillars, nanowires, nanoparticles, thin films, multilayered materials, graded materials, and architecture-designed materials. - Changes in deformation types or patterns due to changes in scale including those due to size affected phase transformations, changes in density and types of interfaces, as well as available deformation sources. - Ex-situ and in-situ (SEM, TEM, XRD, neutron, etc.) mechanical characterization methods. - Modeling and simulation at all scales, as well as coupled scale modeling, of mechanical behavior of nanostructured materials - Confinement and size effects in glasses and disordered media. - Small scale mechanics of soft matter: polymers, and biomaterials (e.g collagen, chitin, and keratin, as well as other organic materials).

2018 TMS Annual Meeting & Exhibition: Thermal and Mechanical Stability of Nanocrystalline Materials: Organized by Jason Trelewicz; Daniel Bufford; Fadi Abdeljawad; Jessica Krogstad; Christian Brandl

Nanocrystalline materials exhibit a wide range of desirable properties arising from the high density of internal interfaces. However, the energetic penalty associated with those very interfaces often drives rapid grain boundary migration and grain coarsening, which results in a degradation of the material properties. A great deal of recent work has focused on understanding the fundamental aspects of grain boundary stability by linking the local chemistry and structure of grain boundaries to their behaviors under such conditions as elevated temperatures and mechanical loading. A fundamental understanding of interface stabilization and its implications for technologically relevant properties will ultimately inform engineering strategies to design high-performance nanostructured materials. This symposium aims to discuss interface-driven physics that govern nanostructure stability including both thermodynamic and kinetic effects in nanocrystalline materials. Talks are solicited that cover fundamental and applied aspects of nanostructure design and stability from the nano to macroscales, and across experimental, theoretical, and computational modeling disciplines. Also of interest for this symposium are presentations on non-equilibrium processing, thermal and mechanical stability, and technological applications of nanostructured materials. Topics of interest include, but are not necessarily limited to: - Influences of grain boundary character and local chemistry on grain boundary mobility - Formation of grain boundary complexions and their thermal/mechanical stability - Investigations of grain boundary structure-property relationships - Thermodynamic modeling of nanostructure stability - Synergistic thermodynamic and kinetic effects in stabilizing nanomaterials - Processing and applications of stabilized nanostructured materials - Thermal stability studies for extreme environment applications - Mechanically coupled grain boundary migration and coarsening - Radiation-induced coarsening

2018 TMS Annual Meeting & Exhibition: Ultrafine-grained Materials X: Organized by Suveen Mathaudhu; Irene Beyerlein; Avinash Dongare; Chong Soo Lee; Terry Lowe; Srikanth Patala; Lee Semiatin; Jason Trelewicz; Janelle Wharry; Caizhi Zhou

This is the tenth international symposium that focuses on all aspects of the science and technology of ultrafine grained (UFG) and nanocrystalline materials. This symposium covers a broad scope, ranging from fundamental science to applications of bulk ultrafine-grained (grain size <1000 nm) and nanostructured (feature size <100 nm) materials. It provides a forum on the topics of fabrication and understanding of UFG and nanocrystalline materials including conventional and emerging technologies and advancements, fundamental issues in severe plastic deformation (SPD) processing and SPD-processed materials, UFG and nanocrystalline microstructure evolution, mechanical and physical properties, deformation mechanisms, superplasticity, joining and bonding, computational and analytical modeling, structural and functional applications, etc. Other emerging topics to be covered include gradient and layered nanostructures, vapor-phase processing, powder processing, rapid-solidification methods, bio-inspired nanomaterials, and radiation tolerant nanomaterials. Also, in honor of the 10th iteration of this symposium, we will hold a “Pioneers of Ultrafine Grained Materials” session that will highlight the contributions of the superheroes of this field. Awards: UFG X will be hosting a Young Scientist Session for students or post-docs within three years of receiving their Ph.D. There will be up to two Gold Medals and three Silver Medals for best oral presentation. Awards will also be given for best poster (One Gold Medal and two Silver Medals). A committee that includes the symposium organizers and invited speakers will decide the awards. Each medalist will receive a certificate, and may receive a cash prize, depending on resources available.