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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Microstructural Templates Consisting of Isostructural Ordered Precipitate / Disordered Matrix Combinations: Microstructural Evolution and Properties
Presentation Title Precipitate Strengthening and Stabilization Mechanisms in Cast and Additively Manufactured Al-Cu-Mn-Zr Alloys
Author(s) Jonathan Poplawsky, Richard A. Michi, Sumit Bahl, Brian Milligan, Patrick Shower, Lawrence Allard, Matthew F. Chisholm, Dongwon Shin, Kevin D. Sisco, Alex J. Plotkowski, Ryan R. Dehoff, Allen Haynes, Amit Shyam
On-Site Speaker (Planned) Jonathan Poplawsky
Abstract Scope A microstructure rich in θ’ precipitates (Al2Cu) is critical for AlCu alloys’ strength, but these alloys soften after exposures to temperatures >250oC. Mn and Zr microsolute additions stabilize the θ’ microstructure after 350oC, >200 hrs exposures. Advanced microscopy and computational techniques revealed that interfacial Mn segregation creates solute drag and decreases the interfacial energy, which allows for the slower diffusing Zr/Ti to form an L12 structure at the θ’ interfaces, further stabilizing the microstructure. Recently, an additively manufactured (AM) Al-Cu-Mn-Zr (ACMZ) alloy was developed that is stronger than the cast-ACMZ counterpart after 200 hr exposures to 300, 350, and 400 °C, which is partly due to the unique microstructure and solute supersaturation achieved by rapid solidification. The differences in the microstructure and mechanical properties of the cast and AM-ACMZ alloys will be discussed. The microscopy was conducted at ORNL’s CNMS, which is a U.S. DOE Office of Science user facility.
Proceedings Inclusion? Planned:


Bcc-Superalloys Microstructure Templates: Tungsten to Titanium to Iron
Comparison of γ' and B2 Precipitates and Their Influence on the Mechanical Behavior of FeNiCoAl-based High-entropy Alloys
Core/Triple Shell Precipitates in Al-Er-Sc-Zr-(V,Nb,Ta) Alloys
Deformable Intermetallic Nanorods Leads to an Excellent Strength-ductility Combination in a High Entropy Alloy
Design of Precipitation Strengthened Metastable High Entropy Alloys
Free Energy Landscape, Transformation Pathway and Alloy Parameters Leading to Various Isostructural Ordered Precipitate Microstructures
High Temperature Deformation Pathways in Ordered L12- and Immm-based Compounds
Investigation of Nucleation Mechanisms Associated with the Formation of Coprecipitates in Ni-based Superalloys
Microstructural Engineering in NiCoCr Medium Entropy Alloys
Novel Nickel-based Alloys for High Temperature Structural Applications
On the Detailed Morphological and Chemical Evolution of Phases during Laser Powder Bed Fusion and Common Post-processing Heat Treatments of IN718
Optimizing Composition and Microstructure in Compositionally Complex Alloys Possessing bcc and B2 Mixtures
Precipitate Strengthening and Stabilization Mechanisms in Cast and Additively Manufactured Al-Cu-Mn-Zr Alloys
Precipitation of Ordered B2 Precipitates in BCC Al2.7CrMnTiV High-entropy Alloys
Seeing the Shearing of Short-range Order with Dislocations in the High-entropy Alloy
The Microstructural Design and Thermomechanical Processing of Compositionally Complex Alloys
The Origin and Stability of Nanostructural Hierarchy in Nickel-base Superalloys
The Role of Precipitate Size Distribution and Morphology on Ni Superalloy Deformation Micromechanisms
Tuning the Degree of Chemical Ordering in the Solid Solution of a Complex Concentrated Alloy and Its Impact on Mechanical Properties
Understanding the Role of Chemistry on Planar Fault Energies in A3B Compositions

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