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<p>The effects of aging temperatures and cryogenic heat treatment time on the microstructure and mechanical properties of the Al-Mg-Sc-Zr alloy fabricated by Selective Laser Melting (SLM) were systematically investigated. A comprehensive examination of different aging and cryogenic treatments revealed that the optimum aging condition is 330 °C for 1 hour. The application of the optimized post-processing parameters yielded significantly enhanced mechanical properties in the alloy, as evidenced by a hardness of 172 HV, a tensile strength of 560.93&#xa0;MPa, and an elongation of 31.3%. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) analyses further demonstrated increased precipitation of Al<sub>3</sub>(Sc, Zr) particles, a substantially reduced grain size, and augmented grain boundary area. These changes hindered dislocation slip and led to an overall enhancement in the alloy’s performance.</p>

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Selective Laser Melting of Al-Mg-Sc-Zr Alloy: Microstructural Evolution and Mechanical Properties through Cryogenic and Aging Treatment

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Zhitai Wang,
  • Yifei Zhang,
  • Junlei You,
  • Shouyin Zhang,
  • Zhifeng Xu,
  • Fenggang Liu,
  • Fencheng Liu,
  • Chunping Huang

摘要

The effects of aging temperatures and cryogenic heat treatment time on the microstructure and mechanical properties of the Al-Mg-Sc-Zr alloy fabricated by Selective Laser Melting (SLM) were systematically investigated. A comprehensive examination of different aging and cryogenic treatments revealed that the optimum aging condition is 330 °C for 1 hour. The application of the optimized post-processing parameters yielded significantly enhanced mechanical properties in the alloy, as evidenced by a hardness of 172 HV, a tensile strength of 560.93 MPa, and an elongation of 31.3%. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) analyses further demonstrated increased precipitation of Al3(Sc, Zr) particles, a substantially reduced grain size, and augmented grain boundary area. These changes hindered dislocation slip and led to an overall enhancement in the alloy’s performance.