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<p>The Al-Cu-Mg alloy with interrupted non-isothermal aging was examined through a series of tests, including hardness, tensile, friction, and wear, and electrochemical corrosion tests. The microstructure was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The findings indicate that the interrupted non-isothermal aging process significantly improves the microstructure of the alloy, enhancing both its mechanical and corrosion resistance properties. During the first stage, the temperature was initially set to 100&#xa0;°C, then gradually increased to 250&#xa0;°C at a rate of 30&#xa0;°C/h. After the second stage, which also reached 250&#xa0;°C, the θ′ phase within the alloy became finely and uniformly distributed. The alloy exhibited a hardness of 149.3 HV, a tensile strength of 367.3&#xa0;MPa, a friction coefficient of 0.73, and a wear mass loss of 11.2&#xa0;mg. Additionally, the alloy showed a self-corrosion current density of 9.02 × 10<sup>−3</sup>&#xa0;mA/cm<sup>2</sup> and a corrosion rate of 0.2954&#xa0;mm/a.</p>

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Effect of Interrupted Non-isothermal Aging Treatment on Microstructure and Properties of Al-Cu-Mg Alloy

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Zhonghua Cui,
  • Jia Lang,
  • Ruiming Su

摘要

The Al-Cu-Mg alloy with interrupted non-isothermal aging was examined through a series of tests, including hardness, tensile, friction, and wear, and electrochemical corrosion tests. The microstructure was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The findings indicate that the interrupted non-isothermal aging process significantly improves the microstructure of the alloy, enhancing both its mechanical and corrosion resistance properties. During the first stage, the temperature was initially set to 100 °C, then gradually increased to 250 °C at a rate of 30 °C/h. After the second stage, which also reached 250 °C, the θ′ phase within the alloy became finely and uniformly distributed. The alloy exhibited a hardness of 149.3 HV, a tensile strength of 367.3 MPa, a friction coefficient of 0.73, and a wear mass loss of 11.2 mg. Additionally, the alloy showed a self-corrosion current density of 9.02 × 10−3 mA/cm2 and a corrosion rate of 0.2954 mm/a.