温度和加载率对Sn-58Bi合金力学性能影响试验研究  

Experimental of mechanical properties and mechanism for the eutectic Sn-Bi alloys under different temperatures and strain rates loading

作　　者：梁斌[1] 胡鹏 聂源 冯高鹏[1] 周婕群 拜云山 牛公杰[1] 牛伟[1] 周燕良 LIANG Bin;HU Peng;NI Yuan;FENG Gaopen;ZHOU Jiequn;BAI Yunshan;NIU Gongjie;NIU Wei;ZHOU Yanliang(Institute of Systems of Engineering,China Academy of Engineering Physics,Mianyang 621900, China;The Rocket Force Military Delegate Office of Mianyang Area, Mianyang 621900, China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900 [2]火箭军装备部驻绵阳第一军代室,四川绵阳621900

出　　处：《功能材料》2021年第1期1145-1155,共11页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11672278)。

摘　　要：通过不同温度和加载率下拉伸试验,获得了Sn-58%(质量分数)Bi共晶合金的弹性模量、拉伸强度、断裂应变等主要力学参数;结合断口微观组织的观测,对Sn-58%Bi共晶合金拉伸变形特性进行了研究。分析了加载率和温度对Sn-Bi合金变形行为的影响。试验结果分析表明,合金延展性随温度升高而增大,随加载率增大而显著减小。断口微观组织观测分析表明,Sn-Bi合金在不同温度和加载率下,存在不同的变形机制。合金在低温和高加载速率下主要以断解理断裂为主。随温度增加,逐渐转变为韧窝、撕裂棱、解理面为主的准解理断裂,高加载率下以沿晶韧窝断裂和解理断裂为主的综合断裂。The mechanical deformation characteristics of the Sn-58wt.%Bi alloys were investigated by tensile tests combined with microstructure observation.The effects of strain rate and temperature on mechanical deformation behavior were investigated.Tensile tests reveal that the increasing of temperature improved the ductility of the alloys.However,the ductility significantly deteriorated at high strain rate.The fracture surface microstructure of Sn-58Bi alloys were examined using a scanning electron microscope.The results show that there existed different deformation mechanisms applying different strain rates and temperature.The deformability of the alloy decreased at high stain rate and low temperature,which was mainly cleavage fracture.This impact of strain rate on the deformability appeared weaker due to the enhancement of the interface sliding at high temperature.With the increase of temperature,it gradually changed to quasi cleavage fracture,which mainly consisted of dimple,tearing edge and cleavage surface,while intergranular dimple fracture and cleavage fracture were the main comprehensive fracture under high loading rate.

关 键 词：Sn-Bi共晶合金 应变率效应 显微组织 力学性能 断裂和断裂 

分 类 号：TG425[金属学及工艺—焊接]