Sn-Bi二元合金应变速率敏感性的研究  

Study on strain rate sensitivity of Sn-Bi binary alloy

作　　者：刘晨 罗晓斌 彭巨擘 于智奇 王小京[2] LIU Chen;LUO Xiaobin;PENG Jubo;YU Zhiqi;WANG Xiaojing(Yunnan Tin Group(Holding)Co.,Ltd.,Kunming650000,China;School of Material Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang212003,Jiangsu Province,China)

机构地区：[1]云南锡业集团(控股)有限责任公司,云南昆明650000 [2]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《电子元件与材料》2022年第7期763-769,共7页Electronic Components And Materials

基　　金：国家自然科学基金(51775254);云南省稀贵金属材料基因工程(一期2020)(202002AB080001)。

摘　　要：基于合金的微观组织观察,考察了Sn-xBi(x=10,20,30,40,50和58)合金在拉伸载荷下的应变速率敏感行为。试验结果表明,Sn-xBi(x=10和20)合金的微观组织由β-Sn基体及分布于其上的Bi粒子组成,合金形变由晶界滑移控制,应力指数较大;Sn-xBi(x=30,40,50和58)合金微观组织以网状共晶组织为基体,其形变机制随着Bi含量的增大,转变为相界滑移,应力指数减小。当应变速率由0.0001 s^(-1)增大到0.1 s^(-1)时,Sn-20Bi的断裂模式由延性断裂转变为具有塑性形变的混合断裂。这一断裂模式的转变与合金在不同速率下的形变机制有关。Based on the microstructure observation of Sn-Bi alloy,the strain rate sensitivity of Sn-xBi(x=10,20,30,40,50 and 58)alloys under tensile load was investigated.The results showed that the microstructures of Sn-xBi(x=10 and 20)alloys were composed ofβ-Sn matrix,and Bi particles was randomly distributed in the matrix.The deformation behavior was controlled by the grain boundary slip and the strain rate sensitivity was high.The matrix of Sn-xBi(x=30,40,50 and 58)alloys were mainly network eutectic structures,while similar strain rate sensitivity was achieved.Their deformation mechanism changes from grain boundary slip to phase boundary slip with increasing Bi content.With increasing strain rate from 0.0001 s^(-1)to 0.1 s^(-1),a ductile-to-mixed fracture with plastic deformation was observed in Sn-20Bi.This transition is related with the variation of the deformation mechanism under increasing strain rate.

关 键 词：Sn-Bi焊料 应变速率敏感性 抗拉强度 微观组织 

分 类 号：TG425.1[金属学及工艺—焊接]