Scholarlink

<p>Equiatomic AlCoCrFeNi high-entropy alloy (HEA) and its rhenium-modified variant (AlCoCrFeNi–1 at% Re) were synthesized via mechanical alloying followed by hot pressing. This study demonstrates that minor, classical alloying with only 1 at% Re significantly enhances mechanical and thermal stability without altering the base processing route. Both alloys exhibited a dual-phase FCC–BCC structure with M₂₃C₆ carbides. Rhenium promoted Cr–Re solid solution formation during milling, refined the post-sintering microstructure, improved densification, and modified lattice parameters. The Re-containing alloy showed nearly a threefold increase in flexural strength at room temperature and moderate improvements in tensile strength at room and elevated temperatures (750–900&#xa0;°C). Dilatometry and post-deformation XRD analyses revealed temperature-induced phase evolution. The Re-modified alloy exhibited smoother thermal expansion behavior and improved high-temperature stability. The principal advantage of this investigation lies in demonstrating that a minor Re addition effectively enhances the strength and microstructural stability of mechanically alloyed and hot-pressed HEAs without complex processing modifications.</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

Rhenium-induced strengthening and microstructural stability in hot-pressed AlCoCrFeNi dual-phase high-entropy alloy

  • 期刊论文

  • 发表日期：

    2026年3月18日

查看全文
  • K. Bochenek,
  • Ł. Rogal,
  • D. Jarząbek,
  • M. Włoczewski,
  • T. Rygier,
  • P. Jenczyk,
  • A. Seweryn,
  • M. Basista

摘要

Equiatomic AlCoCrFeNi high-entropy alloy (HEA) and its rhenium-modified variant (AlCoCrFeNi–1 at% Re) were synthesized via mechanical alloying followed by hot pressing. This study demonstrates that minor, classical alloying with only 1 at% Re significantly enhances mechanical and thermal stability without altering the base processing route. Both alloys exhibited a dual-phase FCC–BCC structure with M₂₃C₆ carbides. Rhenium promoted Cr–Re solid solution formation during milling, refined the post-sintering microstructure, improved densification, and modified lattice parameters. The Re-containing alloy showed nearly a threefold increase in flexural strength at room temperature and moderate improvements in tensile strength at room and elevated temperatures (750–900 °C). Dilatometry and post-deformation XRD analyses revealed temperature-induced phase evolution. The Re-modified alloy exhibited smoother thermal expansion behavior and improved high-temperature stability. The principal advantage of this investigation lies in demonstrating that a minor Re addition effectively enhances the strength and microstructural stability of mechanically alloyed and hot-pressed HEAs without complex processing modifications.