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金属学报  2005 

纳米压痕法测量Sn--Ag--Cu无铅钎料BGA焊点的力学性能参数

, PP. 775-779

Keywords: Sn--Ag—Cu,纳米压痕,Young's模量

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Abstract:

对Sn--3.0Ag--0.5Cu无铅体钎料和Sn--4.0Ag--0.5Cu无铅钎料BGA(ballgridarray)焊点进行了Berkovich纳米压痕法实验,通过改变不同的加载速率研究了钎料的蠕变特征。钎料压痕载荷-位移曲线蠕变部分表现出了明显的加载速率相关性。基于Oliver--Pharrr法确定的体钎料和BGA焊点的Young's模量分别为9.3和20GPa.基于压痕做功概念确定的体钎料和BGA焊点的应变速率敏感指数分别为0.1111和0.0574。钎料的力学性能有着明显的尺寸效应。

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