纳米压痕法测量80Au/20Sn焊料热力性能  

Thermomechanical characterization of 80Au/20Sn solder using nanoindentation

作　　者：张国尚[1] 荆洪阳[1] 徐连勇[1] 魏军 韩永典[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]新加坡制造技术研究院,新加坡638075

出　　处：《焊接学报》2009年第9期53-56,共4页Transactions of The China Welding Institution

基　　金：教育部新世纪优秀人才基金资助项目(NCET-06-0235);国家自然科学基金资助项目(50575160);教育部高等学校博士点基金资助项目(20050056035)

摘　　要：采用恒加载速率/载荷纳米压痕试验测量了25,75,125及200℃下80Au/20Sn焊料的热力性能.结果表明,加载速率、施加载荷和温度对压痕载荷位移曲线影响显著;80Au/20Sn焊料具有较强的加载速率敏感性,显著的尺寸效应,125和200℃下出现了明显的"挤出"现象;应用半椭圆模型对产生"挤出"的接触面积修正后基于Oliver-Pharr方法求得了弹性模量和硬度;弹性模量和硬度随加载速率的增加迅速增大后趋于稳定,随施加载荷增加先减小后几乎保持不变,随温度升高而急聚降低.The thermomechanical behaviors of the 80Au/20Sn solder at 25,75,125 and 200 ℃ were investigated by constant loading rate/load nanoindentation tests.The results showed that the load-displacement curves depended on the loading rate,applied load and temperature strongly.The loading rate sensitivity,obvious size effect,piling up at 125 and 200 ℃ were observed.The elastic modulus and hardness were obtained using the Oliver-Pharr method after the contact area was modified based on the semi-ellipse method.The elastic modulus and hardness increase rapidly with the improved loading rate then reach an approximately steady stage,decrease initially as the increased load ultimately attain a steady-state value,decline greatly with the higher temperature.

关 键 词：80Au/20Sn焊料 纳米压痕 热力性能 

分 类 号：TB302.3[一般工业技术—材料科学与工程]