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- 저자 : Yousef Mazaheri (검색결과 1 건)
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High Strength-Elongation Balance in Warm Accumulative Roll Bonded AA1050 Sheets
Ali Akhavan Attar,Ali Alavi Nia,Yousef Mazaheri,Ehsan Ghassemali 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2
Several studies had been performed on accumulative roll bonding (ARB) for AA1050; however, most of them were conductedat room temperature. Here, the ARB process was performed on AA1050 plates through nine cycles at elevated temperature. An innovation introduced a new parameter ( UTS×El. ) to compare the strength-elongation balance between the present studyand previous works. Also, as another parameter, the toughness was compared. Comparing these parameters with previousworks showed that the considered samples in the present study performed 14 to 63% better than the other samples, so theywere more industrially favorable in terms of mechanical behavior and performance. ARB process at elevated temperaturemay slightly lead to grain growth compared to room/cryogenic temperature, but creates a better elongation, which ultimatelyleads to a better balance of the strength-elongation parameter. The results showed that the effect of inter-cycle heating wasfound significant on microstructural evolution and mechanical behavior. Upon five cycles of the process, the grain sizewas decreased from 35 to 1.8 μm. The yield strength and ultimate strength increased up to 305% and 94%, respectively. Microhardness test showed that warm ARB reduces inhomogeneity factor in the thickness after 3 cycles. Fractography bySEM showed that the sample failed through shear ductile rupture and that the dimples became smaller, more elongated, andshallower onto the failure surface as the number of ARB cycles increased. In short, the warm process is preferred to the coldprocess to achieve better mechanical performance and toughness.
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