Elucidating the mesoscale deformation in a multi-principle element alloy with hexagonal closed-packed crystal structure

Kuang, Jie and Zhang, Dongdong and Wang, Shubin and Huo, Qinghuan and Du, Xinpeng and Zhang, Yuqing and Liu, Gang and Wen, Wei and Zhang, Jinyu and Sun, Jun (2024) Elucidating the mesoscale deformation in a multi-principle element alloy with hexagonal closed-packed crystal structure. Materials Research Letters, 12 (7). pp. 515-524. ISSN 2166-3831

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Abstract

To date, the exploration of multi-principal element alloys (MPEAs) has rarely ventured into the realm of hexagonal close-packed (HCP) structures. In this research, we embarked on a pioneering systematic comparison between a single-phase Ti-Zr-Hf HCP-MPEA and Ti regarding their dislocation activities and mesoscale deformation homogeneity. Through large-area high-resolution quasi-in-situ slip trace analysis and crystal plasticity finite element modeling, we identified HCP-MPEA’s significantly enhanced pyramidal slip activities—resulted from minimized disparities among different deformation modes—notably improve the material’s intragranular deformation homogeneity. Alongside MPEA’s intrinsically high slip resistance, it renders HCP-MPEA an outstanding strength-toughness combination relative to its conventional HCP counterparts.