摘要
采用不同铒含量的7组Al-20Cu-9.6Si-xEr钎料分别对SiCp/A356复合材料进行了真空钎焊。利用扫描电镜和能谱分析等方法对接头微观组织进行了观察和分析。通过剪切实验对钎焊接头的抗剪强度进行了测定,并对剪切断口的微观形貌进行了观察。结果表明:添加稀土后,钎焊接头的抗剪强度明显提高。当w(Er)=0%时,钎缝处SiC颗粒聚集严重,接头强度为43.5MPa;当w(Er)=0.05%时,钎缝边界无SiC颗粒的聚集,接头强度最高,达到68.6MPa;当w(Er)=0.1%-0.4%时,钎缝处SiC颗粒聚集趋势减弱,接头强度值在45.3-50.5MPa之间;当w(Er)=0.5%时,SiC颗粒分布在钎缝内部,接头强度明显提高,达到62.2MPa。
SiCp/A356 composites were brazed with seven kinds of Al-20Cu-9.6Si-xEr filler metals in vacuum.Microstructure of the brazed joints was observed and analyzed by SEM and EDS.Shear strength was evaluated by shear test,and microstructure of the fracture was observed.The results show that the shear strength of the brazed joints is significantly improved when Er is added.When the content of Er is 0%(mass fraction)the aggregation of SiC is very serious,and the shear strength is43.5MPa.There is no aggregation of SiC in brazing seam boundary,and shear strength reaches the maximum 68.6MPa when the content of Er is 0.05%.The aggregation of SiC is weakened and the shear strength is between 45.3-50.5MPa when the content of Er is between 0.1%-0.4%.The SiC particles are distributed inside the brazing seam,and the joint strength significantly increases to62.2MPa when the addition amount of Er is 0.5%.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2016年第1期60-65,共6页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(51245008)
郑州机械研究所新型钎焊材料与技术国家重点实验室开放课题(SKLABFMT201002)
河南省教育厅科学技术研究重点项目(13A430326)