Effect of Heat Treatment on the Microstructure and Vickers Hardness of Aluminum Alloy Gradient Plate Prepared Through Friction Stir Processing

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-07-29 DOI:10.1007/s11223-024-00652-6

W. W. Song, J. F. Pu, D. Jiang, X. L. Ge, Q. Dong, H. F. Wang

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Abstract

Aluminum alloy plates with varying properties were prepared through the superposition friction stir processing of three different aluminum alloys with friction stir joining technology and subjected to solid solution aging. Experimental results showed that friction stir joining yielded a relatively smooth aluminum alloy surface gradient change plate. The plate surface presented a circular superposition trajectory with a clear outline and a rough surface with a flying edge during preparation. The three superimposed aluminum alloy plates achieved good fusion. In particular, fusion was most evident between the uppermost 5052 aluminum alloy and the middle layer of the 6061 aluminum alloy. The fusion of the middle layer of the 6061 aluminum alloy and the lower layer of the 7075 aluminum alloy weakened, and an obvious dividing line was observed. The average Vickers hardness values of the uppermost and undersurfaces of the samples heat-treated at 540°C were the highest, which were 1.34 and 119.06% higher than those of the samples without heat treatment, respectively. The most notable cross-section Vickers hardness gradient was obtained at the solution temperature of 500°C.

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热处理对摩擦搅拌加工制备的铝合金梯度板显微组织和维氏硬度的影响

通过三种不同铝合金的叠加搅拌摩擦加工技术制备了不同性能的铝合金板材，并进行了固溶时效处理。实验结果表明，摩擦搅拌连接制备的铝合金表面梯度变化板相对光滑。板材表面在制备过程中呈现出轮廓清晰的圆弧叠加轨迹和飞边粗糙表面。三块叠加的铝合金板实现了良好的熔合。尤其是最上层的 5052 铝合金和中间层的 6061 铝合金之间的融合最为明显。6061 铝合金中层和 7075 铝合金下层的融合减弱，出现了明显的分界线。在 540°C 下热处理的样品最上层和最下层表面的平均维氏硬度值最高，分别比未经热处理的样品高出 1.34% 和 119.06%。最显著的截面维氏硬度梯度出现在溶液温度为 500°C 时。

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来源期刊

Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.