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

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.