锆基非晶合金准静态循环加载过程滞弹性行为的反速率依赖性  

Paradoxical Phenomena in Quasi-static Cyclic Loading-unloanding Compression Tests of Zr-based Bulk Metallic Glasses

作　　者：韩振华 孙劲松 杨鑫[1] 康新婷[3] 张国君[1] 张长军[2] Han Zhenhua Sun Jinsong Yang Xin Kang Xinting Zhang Guojun Zhang Changjun(Xi＇ an University of Technology, Xi＇ an 710048, China Chang＇an University, Xi＇ an 710069, China Northwest Institute for Non-Ferrous Metal Research, Xi＇ an 710016, China)

机构地区：[1]西安理工大学,陕西西安710048 [2]长安大学,陕西西安710069 [3]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2017年第9期2577-2582,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51401160;51504191);中国博士后基金(2015M582688);陕西省自然科学基础研究计划(2015JQ5169;Z10-03081);陕西省教育厅专项科研计划(14JK1533)

摘　　要：在几何抑制条件下,对锆基块体非晶试样进行不同加载速率的室温准静态循环加载-卸载压缩实验。结果发现,合金存在明显的滞弹性行为、且滞后环面积与加载速率成反比,这与弹性应力诱发的微观结构演化有关。由于弹性应力诱发的结构演化与剪切带的空间增殖密切相关,因此循环加载能量消耗可用于描述锆基块体非晶合金的剪切带空间增殖能力。The anelasticity behavior of Zr-based bulk metallic glasses was investigated in geometrically constrained quasi-static cyclic loading-unloading compression tests. The results demonstrate that the dissipative energy during cycle loading is in inverse proportion to the cross-head displacement rate used,and the anelasticity behavior has close correlation with the elastic stress-induced microstructure evolution. The dissipative energy during cycle loading in BMGs could be also used as a parameter to characterize the spatial multiplication ability of shear bands. The larger dissipative energy implies the higher spatial multiplication ability of shear bands.

关 键 词：块体非晶合金 塑性变形 剪切带 滞弹性 自由体积 

分 类 号：TG139.8[一般工业技术—材料科学与工程]