Deformation behavior of a TiZr-based metallic glass composite containing dendrites in the supercooled liquid region
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第2期
论文作者：Longjun Wu Zhengwang Zhu Dingming Liu Huameng Fu Hong Li Aimin Wang Hongwei Zhang Zhengkun Li Long Zhang Haifeng Zhang
文章页码：64 - 70
摘 要：The deformation behavior of a TiZr-based bulk metallic glass composite（BMGC） was characterized in the supercooled liquid region（SLR） from 623 K to 693 K. It was observed that the alloy exhibits the deformation behavior from work softening at low temperatures to work hardening at high temperatures.The yield stress and overshoot stress decrease remarkably with the increase of temperature, accompanied by superplasticity. The results showed that the crystallization occurred in the amorphous matrix for the post-deformation samples and the volume fraction of the corresponding crystallization products increased with increasing testing temperature. It is implied that the work hardening behavior was closely associated with the crystallization of the amorphous matrix. The tensile stress can accelerate the crystallization of amorphous matrix and the martensitic transformation of dendrite phases, which implies that the thermal stability of the alloy decreases under tension. These findings shed light on designing new BMGCs with high mechanical performance as well as the good SLR formability.
Longjun Wu1,2，Zhengwang Zhu1,3，Dingming Liu1，Huameng Fu1,3，Hong Li1，Aimin Wang1,3，Hongwei Zhang1,3,4，Zhengkun Li1，Long Zhang1，Haifeng Zhang1,3
1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, University of Science and Technology of China3. Dongguan Eontec Co., Ltd
摘 要：The deformation behavior of a TiZr-based bulk metallic glass composite（BMGC） was characterized in the supercooled liquid region（SLR） from 623 K to 693 K. It was observed that the alloy exhibits the deformation behavior from work softening at low temperatures to work hardening at high temperatures.The yield stress and overshoot stress decrease remarkably with the increase of temperature, accompanied by superplasticity. The results showed that the crystallization occurred in the amorphous matrix for the post-deformation samples and the volume fraction of the corresponding crystallization products increased with increasing testing temperature. It is implied that the work hardening behavior was closely associated with the crystallization of the amorphous matrix. The tensile stress can accelerate the crystallization of amorphous matrix and the martensitic transformation of dendrite phases, which implies that the thermal stability of the alloy decreases under tension. These findings shed light on designing new BMGCs with high mechanical performance as well as the good SLR formability.
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