Surface Nanocrystallization of 7A52 Aluminum Alloy Welded Joint by Aging and Ultrasonic Impact Compound Treatment

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-09-01 DOI:10.1016/S1875-5372(18)30201-7

Chen Chao, Chen Furong, Zhang Huijing

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引用次数: 11

Abstract

Welding joint of 7A52 aluminum was treated by ultrasonic impact technology (UIT) and a combined treatment of aging and ultrasonic impact (A-UIT). The effects of different treatments on the microstructure and properties of the welded joint were compared and analyzed, especially the effects of A-UIT on microstructure and the mechanism of surface hardening of welded joint. The results show that the nanometer grain layer can be successfully prepared by UIT and A-UIT on the surface of aluminum alloy welded joint. From the comparison, it can be found that the surface grain size, surface microhardness and matrix microhardness of the welded joint after A-UIT are significantly higher than those of the welded joint after UIT, which exhibits a better reinforcement. The surface hardening mechanism of welded joints after UIT is fine-grained strengthening, while that of welded joints after A-UIT is fine-grained and precipitated strengthening, which is different from that of UIT.

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时效与超声冲击复合处理7A52铝合金焊接接头表面纳米化

采用超声冲击技术(UIT)和时效与超声冲击联合处理(a -UIT)对7A52铝合金焊接接头进行了处理。对比分析了不同处理对焊接接头组织和性能的影响，重点研究了A-UIT对焊接接头组织和表面硬化机理的影响。结果表明:在铝合金焊接接头表面，采用UIT和A-UIT均可成功制备纳米晶粒层;通过对比可以发现，焊接接头经a -UIT处理后的表面晶粒尺寸、表面显微硬度和基体显微硬度均显著高于经a -UIT处理后的焊接接头，具有较好的补强性。焊接接头表面硬化机制不同于焊接接头表面硬化机制，焊接接头表面硬化机制为细晶强化，而焊接接头表面硬化机制为细晶析出强化。

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