A metallurgical and mechanical study on dissimilar Friction Stir welding of aluminum 1050 to brass (CuZn30)
A metallurgical and mechanical study on dissimilar Friction Stir welding of aluminum 1050 to brass (CuZn30)
复制标题
DOI：
10.1016/j.msea.2011.06.004
复制
发表时间：
2011-08-25
期刊：
影响因子：
6.4
通讯作者：
Rajani, H. R. Zareie
中科院分区：
文献类型：
--
作者：
Esmaeili, A.;Givi, M. K. Besharati;Rajani, H. R. Zareie
研究了搅拌摩擦焊工艺参数对铝1050/黄铜(70%铜-30%锌)接头力学性能和冶金性能的影响。采用光学显微镜、扫描电子显微镜、X射线衍射仪和能谱分析等手段对其微观结构和化学成分进行了分析。为了检测焊缝的力学性能，除了硬度测试外，还测量了焊缝的抗拉强度。研究中的主要参数是刀具转速、偏移量、焊接速度和沉销深度。在本研究中，接头的最大极限抗拉强度为母材(铝)的80%。结果表明，在最佳工艺参数下，除了搅拌区的复合组织外，在合适的材料流动条件下，可以形成无缺陷的接头，在界面处形成窄的多层金属间化合物，从而形成较强的接头。此外，在离开优化条件的情况下，大黄铜碎片和焊接缺陷的出现除了使断裂路径从界面转移到搅拌区外，还会降低焊接强度。结果表明，低转速时界面金属间化合物层消失，过快转速时界面金属间化合物层增厚。此外，在黄铜的TMAZ中观察到了严重的机械孪生现象，这导致了该区域的高硬度。(C)2011爱思唯尔B.V.保留所有权利。
In this research, the effect of Friction Stir welding parameters on mechanical and metallurgical properties of aluminum 1050/brass (70%Cu-30%Zn) joints was investigated. Optical microscopy, SEM, X-ray diffraction analysis and EDS analysis were used to probe microstructures and chemical compositions. In order to examine mechanical properties, besides hardness test, tensile strength of the welds was measured. The main parameters in this study were the tool rotational speed, offset, welding speed, and depth of the sinking pin. The maximum ultimate tensile strength of the joint reached in this research was 80% of the base metal (aluminum). Results show that the optimum parameters will yield a defect free joint arisen from a suitable material flow and a narrow multilayer intermetallic compound at interface in addition to a composite structure in the stir zone which all result in a strong joint. Also, by leaving the optimized condition, occurrence of large brass fragments and weld defects lower weld strength besides shifting fracture path from interface to the stir zone. Also, according to the results, using low rotation speed is accompanied by disappearance of interfacial intermetallic layer, whereas fast rotation will thicken this layer. Moreover, severe mechanical twining is observed in TMAZ of brass which leads to high values of hardness in this region. (C) 2011 Elsevier B.V. All rights reserved.