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      저자 : Mojtaba Movahedi (검색결과 2 건)
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        Roll Bonding Behaviour of Al-3003/Al-4043 and Al-3003/Zn Sheets

        Mojtaba Movahedi,Amir-Hossein Kokabi,Hamid-Reza Madaah-Hosseini,Mahdi Kiani 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.4

        In the present study, the roll bonding behaviour of Al-3003/Al-4043 and Al-3003/Zn sheets were compared. The bi-layer sheets were produced by a roll bonding process at different reductions in thickness and rolling temperatures. The joint strengths of the sheets were evaluated by peel and bend testing before and after supplemental annealing treatment. The peeled surfaces were examined using a scanning electron microscope. The results indicated that the Al-3003/Al-4043 sheets were bonded with higher joint strength and lower threshold reductions in thickness with respect to the Al-3003/Zn sheets. In contrast to the Al-3003/Zn sheets, significant improvement was observed in the joint strength of the Al-3003/Al-4043 sheets after annealing treatment. Moreover, electron microscopy examinations showed that the fracture types of the Al-3003/Al-4043 and Al-3003/Zn sheets were predominantly ductile and brittle, respectively.

      • KCI등재

        Metallurgical Aspects and Wear Performance of Al/(Fe–Cu)p Hybrid Composite Produced Using Friction Stir Processing

        Mehran Karimi Estahbanati,Mojtaba Movahedi 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2

        Al1050/(Fe–Cu) hybrid surface composite was produced using friction stir processing (FSP). The effects of the weightfraction ratio of Fe and Cu powders in the composite and the process pass number (3 and 5 passes) were investigated onthe wear performance and microstructural features of the composite. The results showed that Al–Fe and Al–Cu binary andAl–Fe–Cu ternary intermetallic compounds were in-situ formed at the interface of the Fe–Cu powders and Al matrix. Nonuniformdistribution of the micron-sized and sub-micron particles in the stir zone had a main role in the formation of thebi-modal grain structure in the composite. The average friction coefficient of the composites decreased (up to ~ 40%) andthe wear resistance of the composites improved (up to ~ 85%) compared to the specimen processed without the reinforcingparticles. The composites with the equal weight fraction of Fe and Cu particles and the composites processed at 5 FSP passesshowed superior wear performance. The wear mechanism was changed from the adhesive wear in the 75Cu–25Fe-3 passesand 75Fe–25Cu-3 passes composites to the delamination wear in the 50Fe–50Cu-5 passes composite. The mentioned resultswere discussed in the light of the metallurgical aspects of the produced composites, i.e. uniformity of the aluminum matrixgrain structure and distribution of the reinforcing particles as well as the amount of the intermetallic compounds formed inthe composites.

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