【作者】 孙凤莲；

【Author】 Yanqing Yang,Zongqiang Feng,Maohua Li,Yanxia Chen,Bin Huang (State Key Lab of solidification Processing.Northwestern Polytechnical University,Xi’an.P.R.China)

【机构】 哈尔滨理工大学 精密焊接及微连接实验室；

【摘要】 介绍低银无铅钎料的研究现状及存在的问题;本研究团队的主要研究工作进展;通过与SAC305比较,介绍一种新型低银无铅钎料SACNiBi的可焊性、抗热疲劳、机械疲劳及抗电迁移性能。更多还原

【Abstract】 The properties of an age-hardening aluminum alloy can be affected greatly by the heterogeneous precipitation.The microstructures of the heterogeneous precipitation in an Al-Cu-Mg alloy after artificial ageing were investigated.Two kinds of S phase formed along dislocation were observed by HRTEM and the precipitation sequence,variant selection and the strengthening effect of the S precipitates were discussed. The three-dimentional morphology of the S phase formed along dislocation lines,on grain boundary were characterized by using the technique of STEM-HAADF 3D tomography.Quantitative parameters describing the shape and the distribution of the grain boundary precipitates(GBP) were calculated based on the 3D tomography analysis.更多还原