摘要
利用分离式Hopkinson压杆实验装置(SHPB)研究Zr_(38)Ti_(17)Cu_(10.5)Co_(12)Be_(22.5)大块非晶合金的室温动态压缩断裂行为,应变率控制在～102s-1。该大块非晶在动态压缩条件下表现出完全弹性变形,在断裂之前没有明显的塑性变形。试样沿与加载方向成～42°的方向剪切断裂,剪切面非常粗糙。利用扫描电子显微镜(SEM)研究剪切带的形核和扩展。高倍下在剪切面上观察到明显的微剪切带和微裂纹,表明在动态加载条件下,剪切带形核之后立即促发形成微剪切带或者微裂纹。此外,在剪切面观察到的熔融带表明在动态断裂过程中,绝热也起到了很重要的作用。
The Split Hopkinson Pressure Bar (SHPB) was used to study the failure behavior of Zr-Ti-Cu-Ni bulk metallic glass at room temperature on a strain rate order of 102 s-1. The constitutive behavior of the specimen under dynamic compression is linearly elastic, followed by catastrophic failure with no obviously observed plasticity. The specimen fractured along a dominant shear plane inclined 42° with respect to the loading axis with rough fracture surface. Scanning election microscope (SEM) was used to evaluate...
出处
《兵器材料科学与工程》
CSCD
2009年第2期80-83,共4页
Ordnance Material Science and Engineering
关键词
大块非晶合金
SHPB
动态压缩
断裂表面
bulk metallic glasses
Split Hopkinson Pressure Bar （SHPB）
dynamic compression
fracture surface
