纳米压痕法测量Cu的室温蠕变速率敏感指数  

MEASUREMENT OF CREEP RATE SENSITIVITY OF COPPER AT ROOM TEMPERATURE BY USING NANOIN- DENTATION

作　　者：陈吉[1] 汪伟[1] 卢磊[1] 卢柯[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2001年第11期1179-1183,共5页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划项目 G1999064505资助

摘　　要：介绍一种测量室温蠕变速率敏感指数ｍ的新方法，即通过纳米压痕仪精确测量压头的压入位移ｈ和材料的硬度值来计算ｍ值．用该法分别测得单晶Ｃｕ（１２３）压痕蠕变的ｍ的平均值约为０．００４５；多晶Ｃｕ和纳米晶Ｃｕ晶粒尺寸为３０ｎｍ）的ｍ的平均值分别为０．００７和０．００９４．压痕蠕变曲线与传统的单轴蠕变曲线十分相似；室温ｍ的平均值与加载条件无关，而由材料的微观结构决定．A new method was introduced to measure strain rate sensitivity m of creep at room temperature by using depth-sensing nanoindenter. The results show that the average value of m of single crystal Cu (123) is 0.0045, but that of well-annealed polycrystalline Cu and of electrodeposited nanocrystalline Cu with an average grain size about 30 nm is 0.007 and 0.0094 respectively. The curves of indentation creep are analogous to those obtained from conventional uniaxial creep experiments. The average values of indentation creep rate sensitivities are independent of loading conditions, but are close related to the microstructure of the materials.

关 键 词：纳米压痕 蠕变速率敏感指数 铜 测量 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG115.57[金属学及工艺—金属材料]