Scholarlink

<p>This study addresses the challenges of lightweight medium-entropy alloys (MEAs) for mechanical properties across a wide temperature range and lightweight design. By employing a strategy of interstitial oxygen doping, a body-centered cubic (BCC) structured TiVNb–O lightweight medium-entropy alloy was designed and fabricated. This alloy exhibits exceptional comprehensive properties, with a density below 6.4&#xa0;g/cm<sup>3</sup> and remarkable strengthening effects within the oxygen doping range of 0 to 1 at. pct. Even at an elevated temperature of 800&#xa0;°C, the TiVNb–O<sub>1.0</sub> alloy retains outstanding strength characteristics, achieving tensile and compressive yield strengths of 502 and 630&#xa0;MPa, respectively. The tensile strain of the alloys demonstrates pronounced temperature and oxygen content dependence. As the temperature increases and the oxygen content rises, the tensile strain significantly decreases, exhibiting a distinct “ductile-to-brittle transition”. Through in-depth analysis of oxygen’ role in the tensile failure mechanisms of TiVNb–O alloy, the interaction mechanisms between environmental oxygen, interstitial oxygen and the alloy were elucidated. Specifically, the reaction of vanadium with environmental oxygen reduces surface oxidation resistance, while the binding of interstitial oxygen with vanadium induces localized stress concentration. These two factors synergistically exacerbate the tendency for tensile embrittlement at medium to high temperatures. Furthermore, electrochemical test results reveal that the TiVNb–O alloy possesses excellent corrosion resistance, with a corrosion potential higher than 0&#xa0;mV and a corrosion current density on the order of 10<sup>−7</sup> A/cm<sup>2</sup>.</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

Enhanced Mechanical and Corrosion-Resistant Properties of Medium-Entropy Alloys via Micro-oxygen Solid Solution Strengthening

  • 期刊论文

  • 发表日期：

    2025年7月16日

查看全文
  • Yan Jiang,
  • Qian Yang,
  • Jiahui Gao,
  • Xingyu Zhang

摘要

This study addresses the challenges of lightweight medium-entropy alloys (MEAs) for mechanical properties across a wide temperature range and lightweight design. By employing a strategy of interstitial oxygen doping, a body-centered cubic (BCC) structured TiVNb–O lightweight medium-entropy alloy was designed and fabricated. This alloy exhibits exceptional comprehensive properties, with a density below 6.4 g/cm3 and remarkable strengthening effects within the oxygen doping range of 0 to 1 at. pct. Even at an elevated temperature of 800 °C, the TiVNb–O1.0 alloy retains outstanding strength characteristics, achieving tensile and compressive yield strengths of 502 and 630 MPa, respectively. The tensile strain of the alloys demonstrates pronounced temperature and oxygen content dependence. As the temperature increases and the oxygen content rises, the tensile strain significantly decreases, exhibiting a distinct “ductile-to-brittle transition”. Through in-depth analysis of oxygen’ role in the tensile failure mechanisms of TiVNb–O alloy, the interaction mechanisms between environmental oxygen, interstitial oxygen and the alloy were elucidated. Specifically, the reaction of vanadium with environmental oxygen reduces surface oxidation resistance, while the binding of interstitial oxygen with vanadium induces localized stress concentration. These two factors synergistically exacerbate the tendency for tensile embrittlement at medium to high temperatures. Furthermore, electrochemical test results reveal that the TiVNb–O alloy possesses excellent corrosion resistance, with a corrosion potential higher than 0 mV and a corrosion current density on the order of 10−7 A/cm2.