摘要
利用材料试验机和SHPB装置研究了常态下纯锆的静、动态压缩宏观力学性能。塑性变形阶段的流变应力及硬化率随应变率提高而增大，应变10％～20％段应力-应变曲线表现出凹向上趋势。金相观测表明，孪生是纯锆的重要变形机制，孪晶密度随应变及应变率的增长而增大。大应变时，动态压缩试样侧面观测到与压缩轴呈45°度的宏观裂纹。试样纵向剖开后，金相观测到发展的绝热剪切带。
The compression behavior of pure Zirconium has been investigated over a wide range of strain rates 4.1 ×10^-4s^-1-2.8 × 10^3 s^-1 by MTS and SHPB. The stress-strain curves show an unusual ＂three stage＂ strain-hardening behavior with strong, increasing hardening up to strains between 10% and 20%, and finally decreasing hardening until a maximum stress. Twinning is an important deformation mechanism in Zirconium and increases with the increase of strain and strain rate. The cylindrical compression specimens fail by the athermanous shearing band （ASB） in macroscopic ductile cracking at 45° to the compression axis, which is seen for large deformation tests, and optical micrographs show propagation shearing band in section plane.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第12期2122-2124,共3页
Rare Metal Materials and Engineering
