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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
Presentation Title D022 + D022’ Dual-phase Microstructure in As-cast Al-Mo-Ti Alloys
Author(s) Andreas Leineweber, Mario J. Kriegel, Stefan Martin, ShunLi Shang, Zi-Kui Liu
On-Site Speaker (Planned) Andreas Leineweber
Abstract Scope Certain Al-rich Al-Mo-Ti alloys (e.g. Al73Mo22Ti5) obtained in the as-cast state contain a peculiar microstructure, which consists, according to powder X-ray diffraction analysis of tetragonal D022-Al3(Mo,Ti) as well as of an unprecedented orthorhombic variant thereof, called D022'-Al3(Mo,Ti). Microstructure analysis reveals intergrowth of both phases in a checkerboard microstructure with parallel c-axes and alternate orientations of D022'. Energy dispersive X-ray analysis demonstrates a higher Mo content in D022'-Al3(Mo,Ti) than in D022-Al3(Mo,Ti). The crystal structure of D022'-Al3(Mo,Ti) can be related to shear instability of hypothetical tetragonal D022-Al3Mo revealed by first-principles calculations. Analysis of the lattice metrics of D022' using so-called Aizu strain tensors, commonly used to assess spontaneous strain in ferroelastics, reveals that the strain of D022'-Al3(Mo,Ti) resembles that of the stable monoclinic fcc-based superstructures of binary Al3Mo and Al8Mo3. The checkerboard microstructure minimizes strain energy of the microstructure, which likely has formed by unmixing during or after solidification.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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D022 + D022’ Dual-phase Microstructure in As-cast Al-Mo-Ti Alloys
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Ordered Precipitates and Mechanical Properties of Nickel-base Superalloys Studied by Analytical Scanning and Transmission Electron Microscopy
Precipitation and Deformation Mechanisms of γ’/γ” Co-precipitates in Alloy 718
Sc-free Nanoprecipitate-strengthened Aluminum Alloys with Exceptional Creep Resistance
Stress Induced Sensitization in HAZ of 304 LN Austenitic Stainless Steel
The Quantitative Model for Heat Treatment Parameters and Gamma Prime Variations on Nickel-base Superalloys

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