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<p>In this study, the organizational evolution and strengthening mechanism of Mg-3Nd-1.9Gd-0.5Zn-0.5Zr rare-earth magnesium alloys were systematically investigated by the 450&#xa0;°C multi-directional forging (MDF) process. The results show that the deformation of MDF induces the formation of a unique “necklace-like” bimodal grain structure in the alloy, in which the coarse grains (CGs) texture strength is enhanced and then weakened with the increase of cumulative strain (Σ<i>ε</i>), while the fine grains (FGs) integral number increases from 28.8 to 39.3%. Meanwhile, the second phase is gradually transformed from spherical continuous intergranular precipitation to discontinuous intergranular precipitation, and the distribution uniformity is obviously improved. When Σ<i>ε</i> = 3.15, the alloy obtains a tensile strength of 307&#xa0;MPa and an elongation of 11.66%. Microstructure analysis shows that this excellent mechanical property originates from the synergistic effect of the refined second-phase diffusion strengthening, the orientation hardening of CGs under the strong basal texture, and the fine grain strengthening of the FGs.</p>

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Dynamic Recrystallization and Strengthening Mechanism of Mg-3Nd-1.9Gd-0.5Zn-0.5Zr After Multi-directional Forging

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Yunlong Zhang,
  • Yandong Yu,
  • Zehua Yan,
  • Wei Zhang,
  • Hao Zhou

摘要

In this study, the organizational evolution and strengthening mechanism of Mg-3Nd-1.9Gd-0.5Zn-0.5Zr rare-earth magnesium alloys were systematically investigated by the 450 °C multi-directional forging (MDF) process. The results show that the deformation of MDF induces the formation of a unique “necklace-like” bimodal grain structure in the alloy, in which the coarse grains (CGs) texture strength is enhanced and then weakened with the increase of cumulative strain (Σε), while the fine grains (FGs) integral number increases from 28.8 to 39.3%. Meanwhile, the second phase is gradually transformed from spherical continuous intergranular precipitation to discontinuous intergranular precipitation, and the distribution uniformity is obviously improved. When Σε = 3.15, the alloy obtains a tensile strength of 307 MPa and an elongation of 11.66%. Microstructure analysis shows that this excellent mechanical property originates from the synergistic effect of the refined second-phase diffusion strengthening, the orientation hardening of CGs under the strong basal texture, and the fine grain strengthening of the FGs.