Friction Stir Welding of Al-B 4 C Composite Fabricated by Accumulative Roll Bonding: Evaluation of Microstructure and Me
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Friction Stir Welding of Al-B4C Composite Fabricated by Accumulative Roll Bonding: Evaluation of Microstructure and Mechanical Behavior Alireza Moradi Faradonbeh, Morteza Shamanian, Hossein Edris, Moslem Paidar, and Yahya Bozkurt (Submitted July 16, 2017; in revised form October 27, 2017) In this investigation, friction stir welding (FSW) of Al-B4C composite fabricated by 10 cycles accumulative roll bonding was conducted. In order to investigate the influences of pin geometry on microstructure and mechanical properties, four different pin geometries (cylindrical, square, triangular and hexagonal) were selected. It was found that FSW parameters had a major effect on the fragmentation and distribution of reinforcement particles in stir zone. When the tool travel speed was increased, the distribution of B4C particles was become gradually uniform in the aluminum matrix. The effect of tool rotational speed on the peak temperature was determined to be greater than the tool travel speed. The attained data of tensile properties and microhardness tests showed that the tool travel speed had bilateral effect on the tensile strength. The maximum tensile joint efficiency was obtained as 238% for FSWed of Al-2%B4C composite to annealed base Al sheet. Keywords
accumulative roll bonding, friction stir welding, peak temperature, pin geometry, tensile strength, tool rotational speed
1. Introduction Metal matrix composites (MMCs) are considered in some critical applications such as aerospace and automotive industries due to their good mechanical, thermal and tribological properties. Among these materials, aluminum matrix composites (AMCs) are very attractive because of their low density, high specific strength, high specific stiffness and high wear resistance. In addition, the utilization of AMCs in cars and other vehicles can reduce the fuel consumption and exhaust gas release due to their high strength to weight ratio (Ref 1, 2). Accumulative roll bonding (ARB) is a unique solid-state process, which can be used to produce particle-reinforced metal matrix composites. During ARB, two or more sheets of metals are roll-bonded to a reduction of 50% after appropriate annealing and surface treatments. This produced roll-bonded sheet is cut into the same sheets, and then the ARB process is repeated for required times (Ref 3). In addition to the application of the ARB for MMCs, the fact that ARB causes severe plastic deformation in metals has made it as a promising candidate for production of ultrafine-grained metal matrix composite (Ref 4). According to these good properties of the Alireza Moradi Faradonbeh, Morteza Shamanian, and Hossein Edris, Department of Materials Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran; Moslem Paidar, Department of Materials Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran; and Yahya Bozkurt, Department of Metallurgy and Materials Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722 Istanbul, Turkey. Cont
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