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Abstract <p>Friction stir treatment of aluminum alloys performed without introducing high-strength particles is investigated. Rational friction stir parameters, including a tool rotation speed of 850 rpm and a linear speed of 25–40 mm/min, are determined experimentally. The influence of the tool pin length on the required sizes of the heat-affected and deformation zones is studied. A tool pin length of 1.5–2.0 mm is identified as the most effective. During friction stir treatment, a bowl-shaped treatment zone with uniformly expanding boundaries toward the workpiece surface forms. This treatment results in the fragmentation and uniform distribution of primary intermetallic phase particles. An ultrafine-grained structure with an average grain size of (2.30 ± 0.05) μm is observed in the stir zone. For flat specimens, an overlap of 0.25–0.33 for adjacent passes is recommended.</p>

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Hardening of the 1565ch Aluminum Alloy Surface by Friction Stir Treatment

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • V. V. Ovchinnikov,
  • N. V. Uchevatkina,
  • S. V. Yakutina,
  • O. V. Nikishkina

摘要

Abstract

Friction stir treatment of aluminum alloys performed without introducing high-strength particles is investigated. Rational friction stir parameters, including a tool rotation speed of 850 rpm and a linear speed of 25–40 mm/min, are determined experimentally. The influence of the tool pin length on the required sizes of the heat-affected and deformation zones is studied. A tool pin length of 1.5–2.0 mm is identified as the most effective. During friction stir treatment, a bowl-shaped treatment zone with uniformly expanding boundaries toward the workpiece surface forms. This treatment results in the fragmentation and uniform distribution of primary intermetallic phase particles. An ultrafine-grained structure with an average grain size of (2.30 ± 0.05) μm is observed in the stir zone. For flat specimens, an overlap of 0.25–0.33 for adjacent passes is recommended.