锻压技术

表面机械研磨对5052铝合金表面纳米化与性能的影响

英文标题：Influence of surface mechanical attrition on surface nanocrystallization and properties for 5052 aluminum alloy

作者：王荣华1 刘振奇2

分类号：TG156；TG146.22

出版年,卷(期):页码：2022,47(1):209-215

摘要：

研究了表面机械研磨处理（SMAT）对传统轧制和连铸连轧5052铝合金显微组织、物相组成、硬度和拉伸性能的影响。结果表明：进行SMAT前，连铸连轧5052铝合金的晶粒尺寸（7 μm）要小于传统轧制5052铝合金的晶粒尺寸（13 μm）；进行SMAT后，传统轧制和连铸连轧5052铝合金在表层均会形成细小的晶粒尺寸梯度分布，而且传统轧制和连铸连轧的5052铝合金的心部硬度和表层硬度均会有不同程度的提高，经过5.0 min的SMAT后，心部硬度分别达到89和91 HV，表面硬度基本相当（约为102 HV）；相同SMAT时间下，连铸连轧5052铝合金的抗拉强度和断后伸长率均要高于传统轧制的5052铝合金，当SMAT时间增加至1.0 min及以上时，传统轧制和连铸连轧5052铝合金的抗拉强度有明显提升、断后伸长率略有减小，这主要与SMAT后合金表层形成了一定厚度的加工硬化和细晶强化层有关。

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.

基金项目：

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

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