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<p>The microstructure, mechanical characteristics, and fracture behavior of stir-cast Mg-4.58Gd-0.45Y-0.01Er (Wt%) were studied by subjecting it to solution treatment (T4) and various age-hardening conditions (T6). This study proposed a single-stage aging process with a progressive increase in the age-hardening temperature and time to study the effect of the precipitates on the mechanical properties. The metal mainly comprises the α-Mg, Mg5Gd, and Mg24Y5 phases in all processing conditions. Some bright particles were visible in all of the processing conditions, and the dimensions of these particles increased as the temperature and time of the age-hardening process increased. After being age-hardened at 225 °C for 8 hours, the solution-treated alloy achieves an improved ultimate tensile strength of 123 MPa, in addition to a ductility of 11.5% and a tensile strength of 104 MPa (T4 condition). The Texture study reveals that the proportion of the low-angle grain boundary is more significant than that of the high-angle grain boundary under all processed conditions. Due to its composition, the alloy exhibits cleavage–ductile fracture behavior or a mixed fracture mode, which includes tear ridges, cleavage planes, and a few dimples in the as-cast, T4, and T6 conditions.</p>

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Effect of Heat Treatment on the Mechanical Properties and Microstructure of the Mg-Gd-Y-Er Alloy: An Experimental Study

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • S. Sudharsan,
  • A. Raja Annamalai

摘要

The microstructure, mechanical characteristics, and fracture behavior of stir-cast Mg-4.58Gd-0.45Y-0.01Er (Wt%) were studied by subjecting it to solution treatment (T4) and various age-hardening conditions (T6). This study proposed a single-stage aging process with a progressive increase in the age-hardening temperature and time to study the effect of the precipitates on the mechanical properties. The metal mainly comprises the α-Mg, Mg5Gd, and Mg24Y5 phases in all processing conditions. Some bright particles were visible in all of the processing conditions, and the dimensions of these particles increased as the temperature and time of the age-hardening process increased. After being age-hardened at 225 °C for 8 hours, the solution-treated alloy achieves an improved ultimate tensile strength of 123 MPa, in addition to a ductility of 11.5% and a tensile strength of 104 MPa (T4 condition). The Texture study reveals that the proportion of the low-angle grain boundary is more significant than that of the high-angle grain boundary under all processed conditions. Due to its composition, the alloy exhibits cleavage–ductile fracture behavior or a mixed fracture mode, which includes tear ridges, cleavage planes, and a few dimples in the as-cast, T4, and T6 conditions.