Effect of surface roughness on plasticity of Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5 bulk metallic glass  

表面粗糙度对Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5块体非晶合金塑性的影响(英文)

作　　者：林涛[1] 胡勇[1] 孔令体[1] 李金富[1] 

机构地区：[1]上海交通大学材料科学与工程学院,金属基复合材料国家重点实验室,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第6期1407-1411,共5页中国有色金属学报（英文版）

基　　金：Projects (50771064,50831003) supported by the National Natural Science Foundation of China;Project (10PJ1405900) supported by Shanghai Pujiang Program,China

摘　　要：Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glass （BMG） rods were abraded to different surface roughnesses using different types of waterproof abrasive papers and sometimes polishing pastes, and the compressive deformation behavior was examined. The results show that the yield strength of the BMG is hardly affected while the compressive plasticity increases from 2.3% to 4.5% with decreasing the surface roughness. Observation of the fractured samples under a scanning electron microscope indicates that the rise in plasticity is accompanied with an increase in shear band density. The results suggest that it is necessary to reduce the surface roughness of BMGs for achieving a large plasticity.将Zr52.5Cu17.9Ni14.6Al10Ti5(Vit105)块体非晶合金棒用水砂纸和抛光膏打磨到不同粗糙度,研究表面粗糙度对试样压缩变形行为的影响。结果表明,随着试样表面粗糙度的降低,屈服强度并没有明显变化,但压缩塑性从2.3%提高到4.5%。在扫描电镜下观察断裂试样的侧面发现,塑性越大的试样,剪切带的密度越大。因此,对于非晶合金,要得到较大的塑性,降低表面粗糙度是必要的。

关 键 词：bulk metallic glass surface roughness compressive plasticity stress concentration 

分 类 号：TG139.8[一般工业技术—材料科学与工程]