Indentation creep behaviors of Mg_(61)Cu_(28)Gd_(11) and (Mg_(61)Cu_(28)Gd_(11))_(99.5)Sb_(0.5) bulk metallic glasses at room temperature  

作　　者：孙颖迪 李子全 刘劲松 从孟启 秦静雅 

机构地区：[1]College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics

出　　处：《Journal of Rare Earths》2011年第3期253-258,共6页稀土学报（英文版）

基　　金：supported by the Natural Science Foundation of Jiangsu Province(SBK200922430)

摘　　要：The room temperature creep behaviors of Mg61Cu28Gd11 and（Mg61Cu28Gd11）99.5Sb0.5 bulk metallic glasses（BMGs） were revealed by means of nanoindentation technique.The creep mechanism was explored by characterization of creep rate sensitivity,creep compliance and retardation spectra.The results showed that the experimental creep curves could be well described by a generalized Kelvin model.The low creep rate sensitivity of both Mg-based BMGs indicated that their room temperature creep was dominated by localized shear flow.In addition,the（Mg61Cu28Gd11）99.5Sb0.5 glassy alloy exhibited lower creep rate sensitivity,creep compliance and milder retardation peak,indicating its higher creep-resistance and less relaxed state.Furthermore,the creep retardation spectrum consisted of two relatively separated peaks with the well defined characteristic relaxation times.The room temperature creep behaviors of Mg61Cu28Gd11 and（Mg61Cu28Gd11）99.5Sb0.5 bulk metallic glasses（BMGs） were revealed by means of nanoindentation technique.The creep mechanism was explored by characterization of creep rate sensitivity,creep compliance and retardation spectra.The results showed that the experimental creep curves could be well described by a generalized Kelvin model.The low creep rate sensitivity of both Mg-based BMGs indicated that their room temperature creep was dominated by localized shear flow.In addition,the（Mg61Cu28Gd11）99.5Sb0.5 glassy alloy exhibited lower creep rate sensitivity,creep compliance and milder retardation peak,indicating its higher creep-resistance and less relaxed state.Furthermore,the creep retardation spectrum consisted of two relatively separated peaks with the well defined characteristic relaxation times.

关 键 词：NANOINDENTATION Mg-based bulk metallic glass creep generalized Kelvin model rare earths 

分 类 号：TG139.8[一般工业技术—材料科学与工程]