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<p>Dry sliding wear tests were conducted on rolled 7075 aluminum alloy with varying orientations using a pin-on-disc tribometer. The wear characteristics and underlying mechanisms were systematically investigated through XRD phase analysis, metallographic examination, and comprehensive analysis of wear surface and profile morphology. The study revealed significant anisotropy in both microstructure and dry wear performance across different orientations. Comparative analysis demonstrated that the Al<sub>ND</sub> end face (parallel to the rolling direction) exhibited superior wear resistance compared to the Al<sub>RD</sub> end face (perpendicular to the rolling direction), exhibiting a lower friction coefficient (0.28 ± 0.03) than the Al<sub>RD</sub> (0.35 ± 0.02), manifesting in a higher critical wear load value and reduced mass loss under identical testing conditions. This enhanced performance was primarily attributed to the predominance of the most stable (111) crystallographic plane in the FCC structure on the Al<sub>ND</sub> end face following rolling. Furthermore, the inherent thermal strength of the Al<sub>ND</sub> end face matrix, coupled with the formation of a dense mechanical mixed layer (MML) on the surface, contributed significantly to the improved wear resistance.</p>

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Orientation Dependence of Tribological Properties of Rolled 7075 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Zirun Yang,
  • Hefeng Liang,
  • Kunyou Zhang,
  • Huihui Zhang,
  • Beibei Cai,
  • Hua Lan,
  • Conglin Zhang,
  • Liu Zhang,
  • Xinxing Li,
  • Xinjiang Zhang,
  • Bin Luo

摘要

Dry sliding wear tests were conducted on rolled 7075 aluminum alloy with varying orientations using a pin-on-disc tribometer. The wear characteristics and underlying mechanisms were systematically investigated through XRD phase analysis, metallographic examination, and comprehensive analysis of wear surface and profile morphology. The study revealed significant anisotropy in both microstructure and dry wear performance across different orientations. Comparative analysis demonstrated that the AlND end face (parallel to the rolling direction) exhibited superior wear resistance compared to the AlRD end face (perpendicular to the rolling direction), exhibiting a lower friction coefficient (0.28 ± 0.03) than the AlRD (0.35 ± 0.02), manifesting in a higher critical wear load value and reduced mass loss under identical testing conditions. This enhanced performance was primarily attributed to the predominance of the most stable (111) crystallographic plane in the FCC structure on the AlND end face following rolling. Furthermore, the inherent thermal strength of the AlND end face matrix, coupled with the formation of a dense mechanical mixed layer (MML) on the surface, contributed significantly to the improved wear resistance.