Transition of plasticity and fracture mode of Zr-Al-Ni-Cu bulk metallic glasses with network structures  

具有网络结构的Zr-Al-Ni-Cu块体金属玻璃的塑性和断裂模式转变（英文）

作　　者：蔡安辉[1,2,3] 丁大伟[3] 安伟科[1] 周果君[1] 罗云[1] 李江鸿[2] 彭勇宜[4] 

机构地区：[1]湖南理工学院机械工程学院,岳阳414000 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中国科学院物理研究所,北京100190 [4]中南大学物理与电子学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第8期2617-2623,共7页中国有色金属学报（英文版）

基　　金：Projects(50874045,51301194)supported by the National Natural Science Foundation of China;Project(2144057)supported by the Natural Science Foundation of Beijing Municipality,China

摘　　要：Effect of network structure on plasticity and fracture mode of Zr？Al？Ni？Cu bulk metallic glasses （BMGs） was investigated. The microstructures of transversal and longitudinal sections were exposed by chemical etching and observed by scanning electron microscopy （SEM）. The mechanical properties were examined by room-temperature uniaxial compression test. The results show that both plasticity and fracture mode are significantly affected by the network structure and the alteration occurs when the size of the network structure reaches up to a critical value. When the cell size （dc） of the network structure is ~3μm, Zr-based BMGs characterize in plasticity that decreases with increasingdc. The fracture mode gradually transforms from single 45° shear fracture to double 45° shear fracture and then cleavage fracture with increasingdc. In addition, the mechanisms of the transition of the plasticity and the fracture mode for these Zr-based BMGs are also discussed.研究网络结构对Zr-Al-Ni-Cu块体金属玻璃的塑性和断裂模式的影响。采用化学腐蚀法显示并用SEM观察横截面和纵截面的微观结构,采用室温单向压缩试验测定力学性能。结果表明,网络结构显著地影响Zr-Al-Ni-Cu块体金属的塑性和断裂模式,当网络结构的尺寸达到某一临界值时,塑性和断裂模式发生转变。当胞状结构的尺寸约为3μm时,Zr基块体金属玻璃表现出塑性,并且塑性随胞状尺寸的增加而降低。断裂模式随胞状尺寸的增加逐渐由单一45°剪切面断裂向双45°剪切面断裂,最后转变为劈裂断裂。另外,探讨这些Zr基块体金属玻璃的塑性和断裂模式发生改变的机理。

关 键 词：bulk metallic glass PLASTICITY fracture mode network structure 

分 类 号：TQ171.71[化学工程—玻璃工业]