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<p>2A12-O aluminum alloy specimens were fabricated using additive friction rolling deposition (AFRD) to investigate the effects of T4 heat treatment on their microstructure and mechanical properties. The AFRD process induced intense dynamic recrystallization, refining the grains to an average size of 2.57 µm, with grain size decreasing progressively from the base to the top of the deposited layers. After heat treatment, significant grain coarsening occurred, with the average grain size increasing to approximately 130.45 µm. Fine second-phase particles were present and increased in quantity along the height direction; heat treatment led to a more uniform distribution of second-phase particles. The deposited layer exhibited a hardness gradient, averaging 108.6 HV. After T4 treatment, the hardness increased to 132.2 HV, and the gradient was effectively eliminated. In the X-direction, mechanical properties exceeded those of the base material, with tensile strength reaching 280.1 MPa and elongation 18.3. Z-direction properties were weaker. After heat treatment, the X-direction strength and toughness of the alloy increased further to 376.5 MPa, with elongation reaching 15.4 %, and the Z-direction strength also increased but was still lower than that of the X-direction.</p>

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The effect of heat treatment on the microstructure and mechanical properties of additive rolling friction deposited 2A12 aluminum alloy

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Hai Zhu,
  • Yuchen Zhang,
  • Tao Zeng,
  • Xiaolong Yan,
  • Jian Zhang,
  • Qing Dong

摘要

2A12-O aluminum alloy specimens were fabricated using additive friction rolling deposition (AFRD) to investigate the effects of T4 heat treatment on their microstructure and mechanical properties. The AFRD process induced intense dynamic recrystallization, refining the grains to an average size of 2.57 µm, with grain size decreasing progressively from the base to the top of the deposited layers. After heat treatment, significant grain coarsening occurred, with the average grain size increasing to approximately 130.45 µm. Fine second-phase particles were present and increased in quantity along the height direction; heat treatment led to a more uniform distribution of second-phase particles. The deposited layer exhibited a hardness gradient, averaging 108.6 HV. After T4 treatment, the hardness increased to 132.2 HV, and the gradient was effectively eliminated. In the X-direction, mechanical properties exceeded those of the base material, with tensile strength reaching 280.1 MPa and elongation 18.3. Z-direction properties were weaker. After heat treatment, the X-direction strength and toughness of the alloy increased further to 376.5 MPa, with elongation reaching 15.4 %, and the Z-direction strength also increased but was still lower than that of the X-direction.