Scholarlink

<p>This study investigates the effect of gadolinium (0.1-0.8&#xa0;wt.%) on the solidification behavior, microstructure, mechanical properties, and tribological performance of a recycled Al-0.5Fe-0.5Si alloy. Thermal analysis reveals that Gd addition transforms the solidification path from two phases (α-Al and Al<sub>3</sub>Fe) in the base alloy to four phases, including the newly formed Al<sub>3</sub>Gd and Al<sub>3</sub>(Fe,Gd,Si). XRD and SEM-EDS jointly confirm the precipitation of these Gd-containing intermetallics. Microstructural analysis reveals progressive grain refinement, reaching approximately a 60% reduction at 0.8&#xa0;wt.% Gd—consistent with extended dendrite coherency time. Mechanical testing demonstrates significant improvements: + 14% in ultimate tensile strength, + 29% in hardness, with only a moderate reduction in ductility. Tribological performance is also enhanced, with a 45% reduction in coefficient of friction and a 31% decrease in wear rate. These enhancements are attributed to grain refinement and precipitation of hard Gd-intermetallics, which hinder dislocation motion and reduce adhesive wear.</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

Effect of Gadolinium Addition on the Thermal, Microstructural, Mechanical, and Tribological Properties of Recycled Al-0.5Fe-0.5Si Alloy

  • 期刊论文

  • 发表日期：

    2025年11月7日

查看全文
  • Ali M. H. Altameemi,
  • Tuty Asma Abu Bakar,
  • Saeed Farahany,
  • Mohd Ayub Sulong,
  • Hamidreza Ghandvar

摘要

This study investigates the effect of gadolinium (0.1-0.8 wt.%) on the solidification behavior, microstructure, mechanical properties, and tribological performance of a recycled Al-0.5Fe-0.5Si alloy. Thermal analysis reveals that Gd addition transforms the solidification path from two phases (α-Al and Al3Fe) in the base alloy to four phases, including the newly formed Al3Gd and Al3(Fe,Gd,Si). XRD and SEM-EDS jointly confirm the precipitation of these Gd-containing intermetallics. Microstructural analysis reveals progressive grain refinement, reaching approximately a 60% reduction at 0.8 wt.% Gd—consistent with extended dendrite coherency time. Mechanical testing demonstrates significant improvements: + 14% in ultimate tensile strength, + 29% in hardness, with only a moderate reduction in ductility. Tribological performance is also enhanced, with a 45% reduction in coefficient of friction and a 31% decrease in wear rate. These enhancements are attributed to grain refinement and precipitation of hard Gd-intermetallics, which hinder dislocation motion and reduce adhesive wear.