| Autor: |
Wang, Lu, Feng, Zhengzhong, Xu, Mingqin, Yang, Lin, Li, Zongzhen, Yi, Jiaojiao |
| Zdroj: |
Transactions of the Indian Institute of Metals; Mar2023, Vol. 76 Issue 3, p719-727, 9p |
| Abstrakt: |
Two refractory CrHfNbTa0.5Zr and CrHfMo0.5Ta0.5Zr alloys were designed and prepared by a vacuum arc-melting based on HfNbTaTiZr, exhibiting a dendritic structure with different morphologies and phase components. The round/elliptical dendrites surrounded with the intertwined Cr-rich Laves matrix and Zr-rich BCC network structure of the as-cast CrHfNbTa0.5Zr unprecedently improved the yield strength to 1590 ± 22 MPa, 1.7 times more than 929 MPa of HfNbTaTiZr, and retained a promising plasticity of ~ 5%. In contrast, CrHfMo0.5Ta0.5Zr was barely satisfactory either in strength or plasticity, due to the lath-like dendrites composed of the Mo-rich Laves phase with a high-volume fraction of ~ 70%. A common BCC to HCP phase transformation occurred in the two alloys originated from the instability of (Zr, Hf)-rich BCC phase and the relatively high self-diffusivities and interdiffusion of Zr during the annealing. The hard HCP phase further increased the yield strength of the alloy-Nb but deteriorated the plasticity of the two alloys. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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