The role of Metal-Matrix Composite development During Friction Stir Welding of Aluminum to Brass in Weld Characteristics

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• 作者：H. R. Zareie Rajani (1) hamid.r.zareie@ut.ac.ir r>A. Esmaeili (2) r>M. Mohammadi (3) r>M. Sharbati (4) r>M. K. B. Givi (2)
• 关键词：aluminum – ; corrosion testing – ; metal matrix composites – ; welding
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2012
• 出版时间：November 2012
• 年：2012
• 卷：21
• 期：11
• 页码：2429-2437
• 全文大小：1.6 MB
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• 作者单位：1. School of Engineering, The University of British Columbia, EME 3223, 3333 University Way, Kelowna, BC V1V 1V7, Canada2. School of Mechanical Engineering, University College of Engineering, University of Tehran, Tehran, Iran3. School of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran4. School of Materials Science and Engineering, University College of Engineering, University of Tehran, Tehran, Iran
• ISSN：1544-1024

文摘

The present research aims to investigate the development of brass reinforced aluminum composites during dissimilar friction stir welding of brass and aluminum. Moreover, to probe the effect of such a metal matrix composite on its bed, the cross-sectional properties of joint area are studied in two aspects of corrosion behavior and hardness distribution. Microstructural investigations through optical and electron microscopy show development of lamellar composites within the top site of the stir zone and aluminum surface. The measured iso-hardness contours indicate that evolved composite structures increase the cross-sectional hardness of aluminum locally. Also, the electrochemical assessment of joint area suggests that Al/Br composite structure plays an accelerative role in deterioration of cross-sectional corrosion resistance of aluminum through obstructing passivation and forming microgalvanic cells, where cathodic brass reinforcements intensify the corrosion of anodic aluminum matrix.