块体非晶合金在低温下的剪切带特征  

Shear Band Features of Bulk Metallic Glasses During Indentation at Cryogenic Temperature

作　　者：李磊[1] 魏炳忱[1] 张泰华[2] 谷建生[1] 彭伟[1] 

机构地区：[1]中国科学院力学研究所国家微重力实验室,北京100080 [2]中国科学院力学研究所非线性力学国家重点实验室,北京100080

出　　处：《稀有金属材料与工程》2008年第A04期725-729,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50731008;50771102和10572142);国家重点基础研究发展计划(2007CB613905)资助

摘　　要：通过宏观洛氏压痕实验在低温(193K)下对玻璃转变温度和本征脆性具有显著差别的5种典型非晶合金(Mg65Cu25Gd10,La55Al25Cu10Ni5Co5,Pd43Cu27Ni10P20,Zr47.9Ti0.3Ni3.1Cu39.3Al9.4,Fe52Cr15Mo9Er3C15B6)的剪切带特征进行了研究。考查了剪切带间距和数量与归一化温度和材料本征脆性的关联,并根据放射状剪切带的夹角讨论了不同合金的压力敏感系数及其影响因素。In this work, shear band features of five typical bulk metallic glasses （BMGs） were investigated through instrumented macroindentation at cryogenic temperature （193 K）. These materials include Mg65Cu25Gd10, La55Al25Cu10Ni5Co5, Pd43Cu27Ni10P20, Zr47.9Ti0.3Ni3.1Cu39.3Al9.4, Fe52Cr15Mo9Er3C15B6, which show remarkable difference in glass transition temperature and intrinsic brittleness. The correlation of the spacing and numbers of shear band with the normalized temperature and intrinsic brittleness of the materials were examined. Moreover, pressure sensitivity index of the BMGs was discussed based on the included angles between the shear bands.

关 键 词：块体非晶合金 洛氏压痕 剪切带 本征脆性 

分 类 号：TG139.8[一般工业技术—材料科学与工程]