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Meeting MS&T23: Materials Science & Technology
Symposium Phase Transformations and Microstructure Evolution during Post-Processing of Additively Manufactured Metals
Presentation Title Use of In Situ TEM Heating to Study Transformation Pathways for Metastable Phases in New Candidate Alloys for Additive Manufacturing
Author(s) Mingxuan Li, Baris Yavas, Mark Aindow
On-Site Speaker (Planned) Mingxuan Li
Abstract Scope Laser glazing of solid alloy substrates in powder bed fusion machines is an efficient way to perform an initial screening of candidate alloys for metal additive manufacturing. Recently we have applied this approach to evaluate two types of quasicrystal-reinforced aluminum alloys. Since the quasicrystal phases are inherently metastable, it is important to understand the transformations that may occur in such alloys during the build cycle and/or during post-build heat-treatment. Forensic analysis of the as-built and heat-treated microstructures provides useful information about the phases present in these conditions, but does not capture either the kinetics or the details of the transformation pathways. These aspects can be explored by in situ transmission electron microscopy heating studies on samples prepared by focused ion beam milling. Here we present examples of such studies on phase stability in laser-glazed quasicrystal-reinforced aluminum alloys, and the implications for use of these alloys in additive manufacturing are discussed.


Additive Manufacturing of 718 Ni ODS Alloys and Haynes 230 Alloys with Nanoprecipitates
Impact of Heat Treatment Rates on Phase Transformation in Additively Manufactured Gamma Prime Superalloys IN738LC
Influence of Post-process Forging on Microstructure and Properties of LPBF AlSi10Mg
Influence of Post Processing Annealing on Precipitation and Deformation Behavior of Additvely Processed Beta Titanium Alloys
Laser Reheating and Polishing of Powder-blown Directed Energy Deposition
Microstructural Evolution of One and Two Step Heat Treatments on Electron Beam Powder Bed Fusion Fabricated Haynes 282
Microstructure and Mechanical Characterization of As-deposited and Forged Wire Arc Additively Manufactured (WAAM) 316LSi
Microstructure Engineering of Specialty Alloys via Post Advanced Manufacturing Thermal Treatments
Observation of Structure Coarsening During Annealing of Additively Manufactured Ti-6Al-4V
Tuning the Precipitate Microstructure in the Selective Laser Melted Ti-6Al-2Sn-4Zr-2Mo Alloy via Post Heat Treatment
Understanding the Microstructure Evolution Pathway During the Post Heat Treatment in the Direct Energy Deposited Ti-5Al-5Mo-5V-3Cr Alloy
Use of In Situ TEM Heating to Study Transformation Pathways for Metastable Phases in New Candidate Alloys for Additive Manufacturing

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