Microstructure of Cu60Zr20Ti20 bulk metallic glass rolled at different strain rates

• 来源期刊: 中国科学G辑（英文版）
• 年，卷（期）: 2008,（4）
• 页码范围: 394-399
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11433-008-0045-2

摘要

The structural evolution of Cu60Zr20Ti20 bulk metallic glass during rolling at different strain rates and cryogenic temperature was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and high-resolution transmission electron microscopy (HRTEM). It is revealed that the deformation-induced transformation is strongly dependent on the strain rate. At the lowest experimental strain rate of 1.0×10-4 s-1, no phase transformation occurs until the highest deformation degree reaches 95%. In a strain rate range of 5.0×10-4-5.0×10-2 s-1, phase separation oc-curs in a high deformation degree. As the strain rate reaches 5.0×10-1 s-1, phase separation and nanocrystallization concur. The critical deformation degree for oc-currence of phase transformation decreases with the strain rate increasing.