Scholarlink

<p>Lightweight refractory high-entropy alloys (LRHEAs) show significant promise for high-temperature structural applications, yet often exhibit limited room-temperature deformability and insufficient high-temperature strength. In this study, we address these challenges by engineering low-energy semi-coherent interfaces between the body-centered cubic (BCC) solid solution matrix and C14 intermetallics in the TiZrNbV<sub>0.6</sub>Al<sub>0.75</sub> LRHEA (density = 5.5&#xa0;g&#xa0;cm<sup>−3</sup>). These interfaces provide exceptional dislocation accommodation capability, while the C14 intermetallics contribute 679 ± 57&#xa0;MPa precipitation strengthening, resulting in a remarkable specific yield strength of ~ 282&#xa0;MPa cm<sup>3</sup>&#xa0;g<sup>−1</sup> with 27.5% plasticity at room temperature. The semi-coherent interfaces exhibit outstanding thermal stability at 1073 and 1173&#xa0;K, preserving the C14 morphology, effectively impeding dislocation motion and grain boundary migration. This stability enables exceptional high-temperature strength retention: 1305 ± 12&#xa0;MPa (84% of room-temperature strength) at 1073&#xa0;K (0.6<i>T</i><sub>m</sub>) and 1062 ± 15&#xa0;MPa (68% of room-temperature strength) at 1173&#xa0;K (0.65<i>T</i><sub>m</sub>). This work establishes a novel LRHEA design paradigm that synergistically integrates strength, plasticity, and softening resistance across both ambient and high-temperature regimes.</p> Graphical abstract <p></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

Low-energy semi-coherent interfaces deliver strength-plasticity synergy and softening resistance in a lightweight refractory high-entropy alloy

  • 期刊论文

  • 发表日期：

    2025年10月13日

查看全文
  • Wei-Jian Shen,
  • Rui-Xin Wang,
  • Shun Li,
  • Yu Tang,
  • Shu-Xin Bai

摘要

Lightweight refractory high-entropy alloys (LRHEAs) show significant promise for high-temperature structural applications, yet often exhibit limited room-temperature deformability and insufficient high-temperature strength. In this study, we address these challenges by engineering low-energy semi-coherent interfaces between the body-centered cubic (BCC) solid solution matrix and C14 intermetallics in the TiZrNbV0.6Al0.75 LRHEA (density = 5.5 g cm−3). These interfaces provide exceptional dislocation accommodation capability, while the C14 intermetallics contribute 679 ± 57 MPa precipitation strengthening, resulting in a remarkable specific yield strength of ~ 282 MPa cm3 g−1 with 27.5% plasticity at room temperature. The semi-coherent interfaces exhibit outstanding thermal stability at 1073 and 1173 K, preserving the C14 morphology, effectively impeding dislocation motion and grain boundary migration. This stability enables exceptional high-temperature strength retention: 1305 ± 12 MPa (84% of room-temperature strength) at 1073 K (0.6Tm) and 1062 ± 15 MPa (68% of room-temperature strength) at 1173 K (0.65Tm). This work establishes a novel LRHEA design paradigm that synergistically integrates strength, plasticity, and softening resistance across both ambient and high-temperature regimes.

Graphical abstract