Zr基块体金属玻璃蠕变行为的纳米压痕研究  

Investigation on Creep Behavior of Zr-based Bulk Metallic Glass by Nanoindentation

作　　者：李春燕[1,2] 朱福平 丁娟强[1] 尹金锋 王铮 赵燕春 寇生中[1,2] Li Chunyan;Zhu Fuping;Ding Juanqiang;Yin Jinfeng;Wang Zheng;Zhao Yanchun;Kou Shengzhong(State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Wenzhou Engineering Institute of Pump&Valve,Lanzhou University of Technology,Wenzhou 325105,China;Sinotruk Group Jinan Truck Company Limited,Jinan 250000,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105 [3]中国重汽集团济南卡车有限公司,山东济南250000

出　　处：《稀有金属材料与工程》2020年第10期3353-3360,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51661016,51861021,51571105,51661017);Wenzhou Public Welfare Science and Technology Project(G20170019)。

摘　　要：通过纳米压痕实验研究了加载速率和保载时间对(Zr0.6336Cu0.1452Ni0.1012Al0.12)97.4Er2.6块体金属玻璃(BMG)的蠕变变形行为的影响。实验结果表明,合金试样的蠕变位移随着加载速率或保载时间的增加而增大。另一方面,合金样品的硬度(H)也随着加载速率或保载时间的增加而降低。合金试样在纳米压痕过程中具有尺寸效应,合金试样的硬度随着压痕深度的增加而降低。合金试样在纳米压痕过程中具有锯齿流动现象,并且该现象具有速率依赖性。具体而言,随着加载速率的减小,锯齿流动现象更加明显。合金试样的蠕变应力指数随着加载速率或保载时间的增加而减小。The effect of loading rate and holding time on the creep deformation behavior of(Zr0.6336Cu0.1452Ni0.1012Al0.12)97.4Er2.6 bulk metallic glass(BMG)was investigated by nanoindentation technique.Results demonstrate that the creep displacement of the specimen increases with the increase of loading rate or holding time.On the other hand,the hardness(H)of specimen falls with the rise of loading rate or holding time.The H drops with the growth of indentation depth during the nanoindentation process,which indicates that the specimen has a size effect.The specimen shows a serrated flow phenomenon which has rate dependence.Specifically,as the loading rate declines,the serrated flow phenomenon becomes more obvious.The creep stress exponent of the specimen goes down with the increases of loading rate or holding time.

关 键 词：纳米压痕 硬度 加载速率 应力指数 保载时间 

分 类 号：TG139.8[一般工业技术—材料科学与工程]