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

作者：Meng, Fanqiang^*; Tsuchiya, Koichi; Mei, Qingsong; Jiang, Baozhen; Yokoyama, Yoshihiko

来源：Materials Transactions, 2013, 54(7): 1224-1227.

DOI：10.2320/matertrans.M2013049

• amorphization
• high pressure torsion
• lattice instability
• zirconium-copper-aluminum

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.

• 出版日期2013-7