顯微組織特征
(1. 武漢大學(xué) 物理科學(xué)與技術(shù)學(xué)院， 武漢 430072;
2. Center for Robotics and Manufacturing Systems，
University of Kentucky，Lexington，Kentucky 40506，U.S.A.)
摘 要: 采用氣氛保護(hù)釬焊工藝，對(duì)AA4343/AA3003鋁合金復(fù)合板材料的釬焊接頭組織特征，及其與焊接工藝的關(guān)系和對(duì)接頭區(qū)顯微硬度的影響進(jìn)行了研究。實(shí)驗(yàn)結(jié)果表明，釬焊過渡區(qū)由單相α(Al)固溶體層和Si擴(kuò)散層組成，它們的厚度隨釬焊條件而發(fā)生變化。遠(yuǎn)離焊接區(qū)有一個(gè)α(Al)固溶體殘余層，它的厚度保持20μm基本不變，與焊接參數(shù)和材料性質(zhì)無(wú)關(guān)。討論了釬焊接頭特征組織的形成機(jī)理。
關(guān)鍵字: 鋁合金；釬焊；顯微組織；過渡區(qū)
AA4343/AA3003 Al-alloy sheet
brazed joints
（1.College of Physics Science and Technology，
Wuhan University，Wuhan 430072，China;
2.Center for Robotics and Manufacturing Systems，
University of Kentucky，Lexington，Kentucky 40506，U.S.A.）
Abstract:The metallurgical characteristics, relationships with welding conditions and influence upon microhardness of AA4343/AA3003 aluminum sheet brazed joints were studied by using atmosphere shielded brazing process. The results indicate that the transition zone of the joint consists of an α(Al) solid solution layer and a Si diffusion layer. The thickness of the transition zone varies with the welding conditions. In the part far from the fillet，the thickness of a “residual α(Al) solid solution layer” is nearlyconstant，around 20μm，which is independent of welding conditions and materials. The formation mechanism of the characteristic microstructures was discussed.
Key words: aluminum alloy; brazing; microstructure; transition zone
