一种Zr基块体金属玻璃的纳米压入蠕变行为研究  

CREEP BEHAVIOR OF A Zr-BASED BULK METALLIC GLASS DURING NANOINDENTATION

作　　者：宫岭 刘婷婷[1] 张书婷[1] 王庆[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《上海金属》2015年第3期12-16,共5页Shanghai Metals

基　　金：国家自然科学基金(批准号:51171099)

摘　　要：通过斜坡-保载的球形纳米压痕法研究了Zr55Cu28Ni5Al10Nb2块体金属玻璃的室温蠕变行为。蠕变实验同时考虑了加载速率和峰值载荷水平的影响,并采用基于弹性-粘弹性对应原理的现象学法来描述材料的压痕蠕变行为。结果显示,蠕变位移显示了明显的速率和载荷依赖性。五组元Kelvin模型能很好地拟合蠕变位移-时间数据,不同加载速率条件下的拟合-预测效果非常好。对于缓慢的加载过程,斜坡段对蠕变行为的影响不可忽略。The room temperature creep behavior of Zr55 Cu28 Ni5Al10 Nb2 bulk metallic glass was investigated through spherical nanoindentation with a ramp and hold loading protocol.Creep tests were performed under different loading rates and peak load levels.The phenomenological approach based on a correspondence principle was employed to describe the indentation creep behavior.It was demonstrated that the creep displacement evidently depended on the loading rate and the peak load level.The displacement-time responses for given loading conditions were fit to the five-element Kelvin model very well.By using the obtained fitting parameters of a specific constant rate,other experimental data could be well predicted.The ramp effect on creep behavior should be considered for a very slow loading process.

关 键 词：Zr基 金属玻璃 纳米压痕 蠕变 

分 类 号：TU458.2[建筑科学—岩土工程]