Anomalous Temperature Dependence of Crystalline-to-Amorphous Transformation Induced by High-Pressure Torsion in Zr₅₀(Cu,Al)₅₀

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  • Meng Fanqiang
    Structural Materials Unit, National Institute for Materials Science
  • Tsuchiya Koichi
    Structural Materials Unit, National Institute for Materials Science Graduate School of Pure and Applied Sciences, University of Tsukuba
  • Mei Qingsong
    Structural Materials Unit, National Institute for Materials Science
  • Jiang Baozhen
    Structural Materials Unit, National Institute for Materials Science Graduate School of Pure and Applied Sciences, University of Tsukuba
  • Yokoyama Yoshihiko
    Institute for Materials Research, Tohoku University

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  • Anomalous Temperature Dependence of Crystalline-to-Amorphous Transformation Induced by High-Pressure Torsion in Zr<sub>50</sub>(Cu,Al)<sub>50</sub>

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Martensite phases of Zr50Cu50 and Zr50Cu44Al6 were deformed by high-pressure torsion (HPT) at different temperatures ranging from 253 to 473 K. Microstructural observations revealed that the crystalline-to-amorphous transformation induced by HPT showed remarkable temperature dependence: an increase in deformation temperature up to 473 K significantly increased the fraction of the amorphous structure. This result suggests that the lattice instability near martensitic transformation temperature promotes crystalline-to-amorphous transformation, which is coherent to the generalized Lindemann criterion of defect-induced amorphization.

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