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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Recent Investigations and Developments of Titanium-containing High Entropy Alloys
Presentation Title Effect of Elemental Combination on Microstructure and Mechanical Properties of Refractory Medium Entropy Alloys
Author(s) Shuhei Yoshida, Qian He, Hideyuki Yasuda, Nobuhiro Tsuji
On-Site Speaker (Planned) Shuhei Yoshida
Abstract Scope Refractory medium entropy alloys (RMEAs) are alloys composed of four or fewer refractory elements (e.g., Nb and Ta) with near equiatomic composition. The present study clarified the effect of elemental combination on microstructure and mechanical properties of RMEAs. Ingots of RMEAs (e.g., HfNbTiZr) having various compositions, which are sub-systems of the HfNbTaTiZr high entropy alloy, were fabricated by using vacuum arc-melting of pure metals. Microstructures of the as-cast materials were found to be classified into three groups depending on the location along solidification direction. Homogenization was performed to remove segregation originated from the solidification process. Tensile tests at room temperature revealed that the as-cast RMEAs mainly exhibited brittle fracture, while they became ductile after the homogenization. We attributed this change in mechanical properties to the removal of elemental segregation through the homogenization process. The relationship among the chemical composition, segregation behavior, and mechanical properties will be discussed in the presentation.
Proceedings Inclusion? Planned: None Selected
Keywords High-Entropy Alloys, Mechanical Properties, Solidification


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