Microstructure and Hardness Analysis of Aluminum Alloy Gradient Plate Prepared by Friction Stirring After Heat Treatment

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-03-01 DOI:10.1007/s11223-024-00614-y

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Abstract

A friction stir joining technology was used in preparing a performance gradient aluminum alloy sheet through friction stirring. The sheet was treated by solution aging, and the metallographic structure and hardness of the sheet before and after heat treatment were analyzed. Results showed that the sheet with good hardness gradient distribution can be obtained by selecting appropriate process parameters. When the rotation speed of the stirring tool is 300 rpm, the feed speed of the stirring tool is 250 mm/min, the downward pressure of the stirring tool is 6.6 mm, the hardness distribution of the upper and lower surfaces and sections of the specimens with or without heat treatment improves, and the best gradient hardness distribution of the sections is obtained. The grains in the stirred region of the prepared gradient sheet obtained by each parameter are refined to a certain extent, especially after heat treatment. Grain changes are obvious, but the grains grow after heat treatment. The second phase precipitated after heat treatment is evenly distributed, and this is effect improves the hardness of the sheet. The aluminum alloy gradient material prepared in this paper can meet the requirements of the automobile industry and other molding plate performance requirements. It is also found that the friction stir joining technology can better prepare aluminum alloy gradient material, and the fabricated material has fewer defects than the continuous casting technology.

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热处理后摩擦搅拌制备的铝合金梯度板的显微结构和硬度分析

采用摩擦搅拌连接技术，通过摩擦搅拌制备了一种性能梯度铝合金板材。对板材进行了固溶时效处理，并分析了热处理前后板材的金相组织和硬度。结果表明，选择适当的工艺参数可以获得硬度梯度分布良好的板材。当搅拌工具的转速为 300 rpm，搅拌工具的进给速度为 250 mm/min，搅拌工具的下压力为 6.6 mm 时，经过或未经过热处理的试样的上下表面和断面的硬度分布均有所改善，并获得了断面的最佳硬度梯度分布。用各种参数制备的梯度片材的搅拌区晶粒都有一定程度的细化，尤其是在热处理后。晶粒变化明显，但热处理后晶粒长大。热处理后析出的第二相分布均匀，从而提高了板材的硬度。本文制备的铝合金梯度材料可以满足汽车工业和其他成型板材的性能要求。研究还发现，搅拌摩擦连接技术能更好地制备铝合金梯度材料，与连铸技术相比，制备的材料缺陷更少。

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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.