Transactions of Materials and Heat Treatment

Title：Influence of surface mechanical attrition on surface nanocrystallization and properties for 5052 aluminum alloy

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ClassificationCode：TG156；TG146.22

year,vol(issue):pagenumber：2022,47(1):209-215

Abstract：

The influences of surface mechanical attrition treatment (SMAT) on microstructure, phase composition, hardness and tensile properties of 5052 aluminum alloy in traditional rolling and continuous casting and rolling were investigated. The results show that the grain size (7 μm) of 5052 aluminum alloy in continuous casting and rolling before SMAT is smaller than that (13 μm) of 5052 aluminum alloy in traditional rolling, and the fine grain size gradient distribution is formed in the surface layer of 5052 aluminum alloy in traditional rolling and continuous casting and rolling after SMAT. The core hardness and surface hardness of 5052 aluminum alloy after SMAT by traditional rolling and continuous casting and rolling both increase to varying degrees. After 5.0 min of SMAT, the core hardness of 5052 aluminum alloy reaches 89 and 91 HV respectively, and the surface hardness is basically the same (about 102 HV). Furthermore, the tensile strength and elongation after fracture of 5052 aluminum alloy in continuous casting and rolling are higher than those of 5052 aluminum alloy in traditional rolling under the same SMAT time. When the SMAT time increases to 1.0 min or more, the tensile strength of 5052 aluminum alloy by traditional rolling and continuous casting and rolling is significantly improved, and the elongation after fracture is slightly reduced, which is mainly related to the formation of a certain thickness for work hardening and fine-grain strengthening layer in the surface layer after SMAT.

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作者简介：王荣华（1981-），女，硕士，副教授 E-mail：wrh359@126.com

Reference：

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