Influence of Process Parameters on Wear Resistance of Surfaces Modified by Friction Stirring Processing in 7075 Aluminum Alloy

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-08-20 DOI:10.1007/s12540-024-01783-w

J. T. Wang, A. X. Liu, Y. K. Zhang, L. Xie, M. T. He, K. Y. Luo, K. J. Hu

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Abstract

7075 aluminum alloy has significant attraction in the field of lightweight materials, but its poor wear resistance limits its application. Therefore, in this study, the optimal wear-resistant weld seam was prepared by adjusting the FSP (Friction Stir Processing). Friction and wear tests were conducted to analyze the wear resistance of the weld seam. Additionally, XRD, SEM, and TEM were used for phase analysis and microstructural characterization of the weld seam. The treated specimens exhibited the significantly higher wear rate and average coefficient of friction during the stabilization stage of samples W1 (welded rate: 60 mm/min; rotation rate: 1000 rpm) and W8 (welded rate: 80 mm/min; rotation rate: 1200 rpm), with increases of 45% and 40% for the wear rate, respectively, and 19% and 13% for coefficient of friction in comparison with the untreated material. The optimized FSP parameters can considerably improve the wear resistance of the material by affecting the heat input, which altered the grain size and distribution in the welded zone. X-Ray diffraction and scanning electron microscopy/energy dispersive spectroscopy studies provided the mechanism underlying grain size and plastic nano twin structures contributions to wear resistance.

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工艺参数对 7075 铝合金摩擦搅拌加工表面耐磨性的影响

7075 铝合金在轻质材料领域具有很大的吸引力，但其较差的耐磨性限制了它的应用。因此，本研究通过调整 FSP（摩擦搅拌工艺）制备了最佳耐磨焊缝。为分析焊缝的耐磨性，进行了摩擦和磨损测试。此外，还使用 XRD、SEM 和 TEM 对焊缝进行了相分析和微结构表征。经过处理的试样在稳定阶段表现出明显更高的磨损率和平均摩擦系数，如试样 W1（焊接速度：60 mm/min；旋转速度：1000 rpm）和 W8（焊接速度：80 mm/min；旋转速度：1200 rpm），与未处理的材料相比，磨损率分别增加了 45% 和 40%，摩擦系数分别增加了 19% 和 13%。优化的 FSP 参数通过影响热输入，改变了焊接区的晶粒大小和分布，从而大大提高了材料的耐磨性。X 射线衍射和扫描电子显微镜/能量色散光谱研究提供了晶粒大小和塑性纳米孪生结构对耐磨性的贡献机制。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.