Scholarlink

<p>To improve the strength of Mg-Gd-based alloys, two important points must be considered. One is the grain refinement degree during hot processing, and the other is the thermal stability of fine grains during final annealing or cooling. In this work, six samples with three different compositions, Mg-13Gd (G13), Mg-9Gd-4Y (GW94), and Mg-10Gd-3Nd (GN103), and two different heat treatments, as-solutioned (AS) and as-aged (AA) states, were used to study the recrystallized microstructure evolutions. The results of hot compression at 753&#xa0;K showed that the AA-type samples had higher recrystallization fractions compared to the AS-type samples. However, the results of annealing at 673&#xa0;K showed that sharp grain growth occurred in the AA-G13 and AA-GW94 samples and that the yield strengths were much lower compared to the AS-type samples. The exciting finding was the excellent thermal stability in the AA-GN103 sample, reflected by the conspicuous co-segregation of Gd and Nd solutes at the grain boundaries. The AA-GN103 sample had no obvious grain growth even after annealing over 300&#xa0;min, and it exhibited the highest yield strength. Therefore, the mixed additions of Gd and Nd are strongly recommended for developing Mg-RE alloys with high strength and thermal stability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the Recrystallized Microstructure Evolutions of Mg-Gd-Based Alloys Using Pre-aging and Element Substitution

  • 期刊论文

  • 发表日期：

    2025年2月18日

查看全文
  • Chun Xi,
  • Xiang Jiang,
  • Mingao Li,
  • Taku Sakai,
  • Xuyue Yang,
  • Qinghuan Huo

摘要

To improve the strength of Mg-Gd-based alloys, two important points must be considered. One is the grain refinement degree during hot processing, and the other is the thermal stability of fine grains during final annealing or cooling. In this work, six samples with three different compositions, Mg-13Gd (G13), Mg-9Gd-4Y (GW94), and Mg-10Gd-3Nd (GN103), and two different heat treatments, as-solutioned (AS) and as-aged (AA) states, were used to study the recrystallized microstructure evolutions. The results of hot compression at 753 K showed that the AA-type samples had higher recrystallization fractions compared to the AS-type samples. However, the results of annealing at 673 K showed that sharp grain growth occurred in the AA-G13 and AA-GW94 samples and that the yield strengths were much lower compared to the AS-type samples. The exciting finding was the excellent thermal stability in the AA-GN103 sample, reflected by the conspicuous co-segregation of Gd and Nd solutes at the grain boundaries. The AA-GN103 sample had no obvious grain growth even after annealing over 300 min, and it exhibited the highest yield strength. Therefore, the mixed additions of Gd and Nd are strongly recommended for developing Mg-RE alloys with high strength and thermal stability.