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<p>Developing structural materials with ultrahigh-temperature capabilities is crucial for aerospace and energy applications, yet achieving a balance of strength, heat-softening resistance, and plasticity remains challenging. Here, we report a tungsten-based W-Re-Os alloy with exceptional mechanical properties up to 1400 °C. Utilizing multi-principal element alloy design principles, three refractory metals with melting points above 3000 °C—W, Re, and Os elements are alloyed using combinatorial additive manufacturing. This approach enabled rapid fabrication of ~500 compositions in a single run. High-throughput micro-indentation testing identified W<sub>42</sub>Re<sub>30</sub>Os<sub>28</sub> as a standout candidate, exhibiting an ultrahigh yield strength of ~1.8 GPa and ~9% compressive plasticity at room temperature, while retaining ~1.4 GPa yield strength with remarkable strain-hardening at 1400 °C, far surpassing other high-temperature alloys reported to date. These properties arise from its dual-phase hypoeutectic microstructure and multiple deformation mechanisms, including basal and non-basal dislocation slip, deformation twinning, and hetero-deformation-induced geometrically necessary dislocations.</p>

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High-throughput discovery of ultrahigh-temperature multi-principal element alloys by combinatorial additive manufacturing

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月8日

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  • Weiqi Wang,
  • Jian Liu,
  • Chenyang Li,
  • Yi-Cheng Lai,
  • Wei Chen,
  • Yunzhuo Lu,
  • Wen Chen

摘要

Developing structural materials with ultrahigh-temperature capabilities is crucial for aerospace and energy applications, yet achieving a balance of strength, heat-softening resistance, and plasticity remains challenging. Here, we report a tungsten-based W-Re-Os alloy with exceptional mechanical properties up to 1400 °C. Utilizing multi-principal element alloy design principles, three refractory metals with melting points above 3000 °C—W, Re, and Os elements are alloyed using combinatorial additive manufacturing. This approach enabled rapid fabrication of ~500 compositions in a single run. High-throughput micro-indentation testing identified W42Re30Os28 as a standout candidate, exhibiting an ultrahigh yield strength of ~1.8 GPa and ~9% compressive plasticity at room temperature, while retaining ~1.4 GPa yield strength with remarkable strain-hardening at 1400 °C, far surpassing other high-temperature alloys reported to date. These properties arise from its dual-phase hypoeutectic microstructure and multiple deformation mechanisms, including basal and non-basal dislocation slip, deformation twinning, and hetero-deformation-induced geometrically necessary dislocations.