Phase Transformations Committee

Technical Programming

2019 TMS Annual Meeting & Exhibition: Additive Manufacturing of Metals: Microstructural Evolution and Phase Transformations: Organized by Bij-Na Kim; Eric Lass; Mohsen Asle Zaeem; Sudarsanam Babu; Ryan Dehoff; Gerhard Fuchs; Chantal Sudbrack

Currently, an immense effort is being put into implementing AM built components in demanding industrial applications. This requires the understanding of the stability of AM microstructures in service, including high load and temperature conditions. Presently, most feasibility studies are limited to existing commercial alloy compositions. Nevertheless, the uniqueness of AM technology opens new opportunities for the design of future alloys specifically tailored for the AM process and its application. The aim of this symposium is to provide a forum for presenting the latest progress towards the future of AM. Topics of interest include, but are not limited to: (1) Microstructural response of AM components to post-processing conditions. (2) Simulation/modelling of phase transformations and microstructure stability of AM components during service. (3) Novel alloy design tailored for AM. (4) Extension of these concepts to high temperature Fe-, Co-, Ni- alloys currently not available as commercial AM product.

2019 TMS Annual Meeting & Exhibition: Algorithm Development in Materials Science and Engineering: Organized by Mohsen Asle Zaeem; Garritt Tucker; Prasanna Balachandran; Douglas Spearot; Charudatta Phatak; Srinivasan Srivilliputhur

As computational approaches to study the science and engineering of materials become more mature, it is critical to develop and improve techniques and algorithms that leverage ever-expanding computational resources. These algorithms can impact areas such as: data acquisition and analysis from sophisticated microscopes and state-of-the-art light source facilities, analysis and extraction of quantitative metrics from numerical simulations of materials behavior, and the ability to leverage specific computer architectures for revolutionary improvements in simulation analysis time, power, and capability. This symposium solicits abstract submissions from researchers who are developing new algorithms and/or designing new methods for performing computational research in materials science and engineering. Session topics include, but are not limited to: - Advancements that enhance modeling and simulation techniques such as density functional theory, molecular dynamics, Monte Carlo simulation, dislocation dynamics, phase-field modeling, CALPHAD, and finite element analysis, - New techniques for simulating the complex behavior of materials at different length and time scales, - Computational methods for analyzing results from simulations of materials phenomena, and - Approaches for data mining, machine learning, high throughput databases, high throughput experiments, and extracting useful insights from large data sets of numerical and experimental results.

2019 TMS Annual Meeting & Exhibition: Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials II: Organized by Haiming Wen; David Seidman; Keith Knipling; Gregory Thompson; Simon Ringer; Arun Devaraj; Gang Sha

Atom probe tomography (APT), is an emergent characterization technique that is capable of determining the chemical identity of each individual atom and generating 3D chemical maps imaging the distribution of individual atoms. The technique offers high spatial resolution (better than 0.3 nm achievable in all directions) and high analytical sensitivity (as good as 7 appm). APT provides information on elemental composition of the specimen, 3D visualization of distribution of atoms, composition of phases, morphology and size of precipitates, and solute distribution across interfaces, at grain boundaries and along dislocations. In many APT analyses, crystallographic information has been retained within the data, with the potential to directly relate the composition of specific microstructural features to their crystallography with unprecedented sensitivity and resolution. APT can be utilized in many different fields for advanced imaging and analysis of metals, minerals and materials, despite some limitations. This symposium is designed to bring together scientists, engineers and technicians from across disciplines to discuss the technique of APT, its applications and limitations. The symposium will encompass research and applications spanning a wide variety of topics. Presentations on experimental, theoretical, and modeling research are solicited. Topics for this symposium include, but are not limited to: - Applications of APT in advanced characterization of metals, minerals and materials - 3D reconstruction and data analysis - Impact of specimen and instrument parameters and optimization of acquisition conditions - Specimen preparation techniques - Limitations of APT - Progress in APT technique - Correlative techniques - Modelling and simulation

2019 TMS Annual Meeting & Exhibition: Irradiation Effects on Phase Transformations in Nuclear Reactor Materials: Organized by Janelle Wharry; Kester Clarke; Julie Tucker; Par Olsson; Dhriti Bhattacharyya; Mohsen Asle Zaeem; Arun Devaraj

Irradiation of materials, including those used in nuclear reactor applications, may alter phase stability or phase transformation kinetics, resulting in unexpected or undesired phases or microstructures. These microstructures may result in unexpected or unpredictable performance characteristics. Topics of interest include, but are not limited to: • Irradiation altered kinetics • Phase transformations at constant chemical compositions • Crystal structure change and polymorphism • Disordering • Amorphization • Phase transformations with chemical composition changes • Precipitate dissolution • Segregation and precipitation • Effect of phase transformations on mechanical properties or material functionality • Synergistic computational and experimental studies Fundamental understanding of the mechanisms contributing to the above topics are of interest, as well as practical understanding that leads to greater understanding of these effects on in-service performance.

2019 TMS Annual Meeting & Exhibition: Phase Transformations and Microstructural Evolution: Organized by Sophie Primig; Deep Choudhuri; Klaus-Dieter Liss; Megumi Kawasaki; Matthew Steiner; Yufeng Zheng; Ashley Paz y Puente; Juan Escobedo-Diaz; Dhriti Bhattacharyya; Rajarshi Banerjee

Phase transformation is one of the most potent and efficient means to produce desired microstructures in materials for various applications. This symposium is a continuation in a series of annual TMS symposia focusing on phase transformations and microstructural evolution in materials during processing and in service. It intends to bring together experimental, theoretical and computational experts to assess the current status of theories of phase transformations and microstructure evolution primarily in the solid states. In addition to fundamental understanding of the mechanisms underlying phase transformations and microstructure evolution; attention will also be given to the utilization of unique transformation pathways to develop novel microstructures for advanced structural and functional materials. The phase transformations topics of choice for this year include, but are not limited to phase transformations in: -Steels and ferrous alloys, non-ferrous alloys, ceramics, and other materials -Shape memory materials -in-situ and ex-situ characterization of transformation kinetics and microstructure evolution Planned publication: All oral presenters are invited to submit regular articles in JOM (3000-6000 words and 8 Figures)

2018 TMS Annual Meeting & Exhibition: Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III: Organized by Eric Lass; Mark Stoudt; Judy Schneider; Lee Semiatin; Behrang Poorganji; Clay Houser

Advances in additive manufacturing (AM) technology have created the ability to design and construct components with geometries and properties that cannot be achieved through traditional solidification and deformation processes. This ability has promoted multiple new design strategies whose success relies on close integration of engineering and materials science. An additional attractive aspect of additive processing is the ability to custom design specific properties within the component by layering, thereby promoting different microstructures or compositions (e.g., functionally-graded materials). However, the repetitive rapid solidification that occurs during AM also creates microstructures that deviate significantly from those observed in wrought materials with the same nominal composition. The result is a segregated microstructure with significant variations in local composition/phases, and, in some cases, life-limiting defects that are typically absent in wrought alloys. Most of the AM research currently focuses on refining the build process and on minimizing the residual stresses generated during the build. Consequently, there is far less emphasis on post-build heat treatments that homogenize the as-built microstructures and promote similar properties to wrought alloys. The main objective of this symposium is to develop a better understanding of the input-material requirements, process capabilities, and the resultant effects on finished product microstructure, texture, and properties. Research that elucidates the process-structure-property-performance relationships resulting from rapid solidification and transient phase transformations is essential. Information regarding the influence of inherent defects on the performance of AM-produced components is also greatly needed. Abstracts are requested that relate transient phenomena, recrystallization, transformation, and rapid solidification to additive manufacturing and its influence on phases, microstructure, and properties. Technical sessions emphasizing the following specific topics are planned: • Microstructure evolution in aluminum alloys, stainless steels and aerospace alloys (e.g., Ti, Ni alloys) • Texture measurements and control in AM parts • Defects and their effect on post-build (service) properties • Residual stress evolution and control • Novel applications, complex geometries fabricated via AM • Modeling of AM processes (including liquid and solid-state phase transformation behavior) • Emerging AM processes

2018 TMS Annual Meeting & Exhibition: Algorithm Development in Materials Science and Engineering: Organized by Mohsen Asle Zaeem; Mark Tschopp; Jonathan Zimmerman; Ebrahim Asadi; Mark Horstemeyer

As computational approaches to study the science and engineering of materials becomes more vital, it is critical to develop and improve techniques and algorithms that leverage ever-expanding computational resources. These algorithms can impact areas such as: data acquisition and analysis from sophisticated microscopes and other types of laboratory equipment, analysis and extraction of critical quantitative metrics from numerical simulations of materials behavior, and the ability to leverage specific computer architectures for revolutionary improvements in simulation analysis time, power, and capability. This symposium solicits abstract submissions from researchers who are developing new algorithms and/or designing new methods for performing computational research in materials science and engineering. Session topics include, but are not limited to: - Advancements that enhance modeling and simulation techniques such as density functional theory, molecular dynamics, Monte Carlo simulation, dislocation dynamics, phase-field modeling, and finite element analysis, - New techniques for simulating the complex behavior of materials at different length and time scales, - Computational methods for analyzing results from simulations of materials phenomena, and - Approaches for data mining, machine learning, high throughput databases, and extracting useful information from large data sets of numerical results.

2018 TMS Annual Meeting & Exhibition: Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials: Organized by Haiming Wen; Simon Ringer; Gregory Thompson; Arun Devaraj; Keith Knipling; Gang Sha; David Seidman; Chantal Sudbrack

Atom probe tomography (APT), is an emergent characterization technique that is capable of determining the chemical identity of each individual atom and generating 3D chemical maps imaging the distribution of individual atoms. The technique offers high spatial resolution (better than 0.3 nm achievable in all directions) and high analytical sensitivity (as good as 1 appm). APT provides information on elemental composition of the specimen, 3D visualization of distribution of atoms, composition of phases, morphology and size of precipitates, and solute distribution across interfaces, at grain boundaries and along dislocations. In many APT analyses, crystallographic information has been retained within the data, with the potential to directly relate the composition of specific microstructural features to their crystallography with unprecedented sensitivity and resolution. APT can be utilized in many different fields for advanced imaging and analysis of metals, minerals and materials, despite some limitations. This symposium is designed to bring together scientists, engineers and technicians from across disciplines to discuss the technique of APT, its applications and limitations. The symposium will encompass research and applications spanning a wide variety of topics. Presentations on experimental, theoretical, and modeling research are solicited. Topics for this symposium include, but are not limited to:  Applications of APT in advanced characterization of metals, minerals and materials  3D reconstruction and data analysis  Impact of specimen and instrument parameters and optimization of acquisition conditions  Specimen preparation techniques  Limitations of APT  Progress in APT technique  Correlative techniques

2018 TMS Annual Meeting & Exhibition: Coupling Advanced Characterization and Modeling Tools for Understanding Fundamental Phase Transformation Mechanisms: An MPMD Symposium in Honor of Hamish Fraser: Organized by Gregory Thompson; Sudarsanam Babu; Peter Collins; Soumya Nag; Rajarshi Banerjee

In celebration of Professor Hamish Fraser’s 70th birthday and his career-long achievements in the fields of phase transformations, microstructure-structure property relationships, and advanced electron microscopy, this symposium aims to bring together experts in each area to address current and developing topics in these respective fields. The symposium of invited talks will cover a broad spectrum of advanced characterization and modeling tools that are available today which are being employed for addressing fundamental phase transformation mechanisms. In particular, the symposium will have dedicated sessions that emphasize phase transformations in non-ferrous alloys, such as Ti-base alloys and intermetallics, areas in which Prof. Fraser has made pioneering contributions. Other sessions will address phase transformation issues at different length scales, both in bulk and in nanostructured materials, and the use of advanced electron microscopy to reveal the underlying mechanisms of phase stability and transformation pathways in these materials.

2018 TMS Annual Meeting & Exhibition: Phase Transformation Across Multiscale Material Interfaces: Organized by Soumya Nag; Sudarsanam Babu; Gregory Thompson; Mohsen Asle Zaeem; Niyanth Sridharan

Interfaces play an important role in determining several properties in multiphase systems. In a materials system, interfaces can be present across different length scales, some examples being: (i) Nanoscale interphase interfaces in a precipitation hardened system, (ii) Microscale interface across ceramic on metal or metal on metal builds; for example bond coat deposition on turbine blade, multilayer thin films and (iii) Macroscale interfaces of joined similar or dissimilar materials; for example in brazing and soldering, transient liquid phase bonding, Diffusive phase transitions across these metastable interfaces can be triggered via thermo-mechanical processing so as to achieve close to equilibrium structural/compositional/stress states. Renditions of time-dependent development of off-equilibrium interface structures have been accomplished through multiscale experimental and computational techniques that allow for identification of the positions of atomic columns and structural defects at the interface. The motivation of this symposium is to bring together such novel studies directed towards identifying phase transformation pathways across multiscale material interfaces.

2018 TMS Annual Meeting & Exhibition: Phase Transformations and Microstructural Evolution: Organized by Gregory Thompson; Mark Aindow; Sudarsanam Babu; Rajarshi Banerjee; Tushar Borkar; Hai Chen; Paul Gibbs; Peeyush Nandwana; Ashwin Shahani; Yufeng Zheng

Phase transformation is still one of the most effective and efficient means to produce desired microstructures in materials for various applications. This symposium is a continuation in a series of annual TMS symposia focusing on phase transformations and microstructural evolution in materials during processing and in service. It intends to bring together theoretical, experimental and computational experts to assess the current status of theories of phase transformations and microstructure evolution primarily in the solid states. In addition to fundamental understanding of the mechanisms underlying phase transformations and microstructure evolution; attention will also be given to the utilization of unique transformation pathways to develop novel microstructures for advanced structural and functional materials.