(1. 哈尔滨工业大学 现代焊接生产技术国家重点实验室，
哈尔滨 150001;
2. Center for Robotics and Manufacturing Systems,
University of Kentucky, Lexington, KY 40506, USA;
3. Department of Mechanical System Engineering,
Hiroshima University, 2-313, Kagamiyama, Higashi-Hiroshima 739-8527, Japan)
摘 要: 研究了钎焊温度对钎焊接头微观组织的影响， 并利用图像软件Image-Pro Plus确定了不同初始凝固温度下α-（Al）相在钎焊接头中的体积分数。 结果表明： 随着初始凝固温度增加， α-（Al）相所占的比例增大。 通过成分分析（EPMA）和硬度测试， 分析了硅扩散层的特征。 压痕法测试结果表明： 不同初始凝固温度下获得的同种组织， 其力学和物理等综合性能不同，从而造成整个钎焊接头力学性能的差异。
关键字: 钎焊凝固接头；初始凝固温度； 压痕法； 微观组织；铝合金
（1. State Key Laboratory of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, China;
2. Center for Robotics and Manufacturing Systems, University of Kentucky, Lexington KY 40506, USA;
3. Department of Mechanical System Engineering,
Hiroshima University, 2-313, Kagamiyama,Higashi-Hiroshima 739-8527, Japan）
Abstract:The influence of initial solidification temperature on the microstructure at the brazed joint zone was investigated. The volume fraction of α-(Al) phase at brazed joint zone at different initial solidification temperatures was obtained by the image-processing software Image-Pro Plus. The results show that this volume fraction increases with increasing initial solidification temperature. The characteristics of so-called silicon diffusion layer were analyzed through EPMA and hardness test. In addition, the micro-indentation method was utilized to determine the properties of similar microstructure produced at different initial solidification temperatures. The differential mechanical properties are found, which will impact the properties of the whole brazed joint.
Key words: brazed joint; initial solidification temperature; micro-indentation; microstructure; aluminum alloy
