(1. 哈爾濱工業(yè)大學 現(xiàn)代焊接生產(chǎn)技術(shù)國家重點實驗室，
哈爾濱 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: 研究了釬焊溫度對釬焊接頭微觀組織的影響， 并利用圖像軟件Image-Pro Plus確定了不同初始凝固溫度下α-（Al）相在釬焊接頭中的體積分數(shù)。 結(jié)果表明： 隨著初始凝固溫度增加， α-（Al）相所占的比例增大。 通過成分分析（EPMA）和硬度測試， 分析了硅擴散層的特征。 壓痕法測試結(jié)果表明： 不同初始凝固溫度下獲得的同種組織， 其力學和物理等綜合性能不同，從而造成整個釬焊接頭力學性能的差異。
關(guān)鍵字: 釬焊凝固接頭；初始凝固溫度； 壓痕法； 微觀組織；鋁合金
（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
