王剑豪,薛松柏,吕兆萍.辐射环境对共晶SnPb钎料焊点力学性能和微观组织的影响[J].稀有金属材料与工程,2019,48(10):3346~3351.[Wang Jianhao,Xue Songbai,Lv Zhaoping.Investigation of the mechanical performance and microstructure of eutectic SnPb solder joints subjected to γ-ray irradiation[J].Rare Metal Materials and Engineering,2019,48(10):3346~3351.]
辐射环境对共晶SnPb钎料焊点力学性能和微观组织的影响
投稿时间:2018-05-25  修订日期:2018-07-27
中文关键词:  空间辐射  共晶SnPb钎料  微观组织  力学性能  断口形貌
基金项目:国家自然科学基金(项目号51675269);江苏高校优势学科建设工程资助项目
中文摘要:
      为了探索研究空间辐射环境下电子器件焊点组织性能变化的规律,满足未来微小型深空探测器对电子器件焊点可靠性的需要,本文采用60Co-γ源部分模拟了空间辐射环境,研究了空间辐射对SnPb共晶钎料焊点微观组织,力学性能和断口形貌的影响。结果表明:在0.25 Gy(Si)/s的剂量率下,γ射线辐照会对SnPb/Cu焊点形成辐照损伤,焊点内的Pb基固溶体中有微孔洞和微裂纹的产生,恶化了焊点的力学性能。经过964 kGy剂量的γ射线辐照后,焊点拉伸力降低了14.12%。断口组织分析表明,辐照后焊点的断裂方式仍为韧性断裂,但其塑性较未辐照的焊点有所降低。
Investigation of the mechanical performance and microstructure of eutectic SnPb solder joints subjected to γ-ray irradiation
英文关键词:Cosmic irradiation  Eutectic SnPb solder  Microstructure  Mechanical performance  Fracture morphology
英文摘要:
      With the development of deep space exploration, miniaturization has become the trend of satellites, which heightens the reliability demand of satellite electronic systems. Solder plays an important role in integrated circuit, providing electronical and mechanical interconnection of electronic devices. To understand the microstructure and performance evolution of solder joints under cosmic irradiation environment and meet the reliability demand of solder joints used on satellites, the effect of γ-ray irradiation on the mechanical performance and microstructure of eutectic SnPb solder joints were investigated. The results show that after γ-ray irradiation, the generation of micro-voids and micro-cracks in Pb-based solid solution are observed due to the accumulation of irradiation damages. Energetic electrons induced by γ photon through Compton Effect, could knock Pb atom out and form point defect, which is the cause of mico-voids and micro-cracks. After 964 kGy irradiation, the tensile force of eutectic SnPb solder joints decreases by 14.12%. Moreover, the analysis of fracture morphology shows that the fracture kinds of eutectic SnPb solder joints before/after γ-ray irradiation are all plastic fractures, but the ductility of eutectic SnPb solder joints is reduced with unobvious dimples.
作者单位E-mail
王剑豪 南京航空航天大学 Wangjh_gareth@163.com 
薛松柏 南京航空航天大学 xuesb@nuaa.edu.cn 
吕兆萍 南京航空航天大学  
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