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.
出处
《上海金属》
CAS
北大核心
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)
关键词
Zr基
金属玻璃
纳米压痕
蠕变
Zr-Based
Metallic Glasses
Nanoindentation
Creep
