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<p>Developing next-generation hypersonic vehicles necessitates structural materials capable of withstanding extreme thermal gradients. However, conventional alloys usually sacrifice room-temperature plasticity for breakthroughs in high-temperature strength. Here, we report a (WTaV)<sub>90</sub>B<sub>10</sub> refractory medium-entropy alloy (RMEA) that overcomes this trade-off, showing decent plasticity of ~6% at ambient temperature, high yield strength of 650 MPa at 1873 K and 242 MPa at 2073 K, and excellent thermal stability up to ~0.7 <i>T</i><sub>m</sub>. The RMEA comprises a BCC metallic solid solution and a boride phase. Interfacial segregation of boron atoms generates gradient-ordering phase boundaries (GOPBs), enhancing stress transfer and plastic compatibility. Strong interfacial bonding of GOPBs and the inherent stability of the dual-phase structure further enable remarkable resistance to ultrahigh-temperature softening. At 2073 K, GOPBs evolve into fully coherent interfaces, ensuring exceptional thermal stability at ~0.7 <i>T</i><sub>m</sub>. This work demonstrates a gradient-ordering strategy for achieving strength-plasticity synergy from ambient to ultrahigh temperatures.</p>

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Strength-plasticity synergy from ambient to high temperature via gradient-ordering in boride-reinforced WTaV medium-entropy alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月21日

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  • Bo Sun,
  • Bingjie Wang,
  • Zhe Jia,
  • Ligang Sun,
  • Juan Kuang,
  • Qianqian Wang,
  • Gang Sha,
  • Xiubing Liang,
  • Baolong Shen

摘要

Developing next-generation hypersonic vehicles necessitates structural materials capable of withstanding extreme thermal gradients. However, conventional alloys usually sacrifice room-temperature plasticity for breakthroughs in high-temperature strength. Here, we report a (WTaV)90B10 refractory medium-entropy alloy (RMEA) that overcomes this trade-off, showing decent plasticity of ~6% at ambient temperature, high yield strength of 650 MPa at 1873 K and 242 MPa at 2073 K, and excellent thermal stability up to ~0.7 Tm. The RMEA comprises a BCC metallic solid solution and a boride phase. Interfacial segregation of boron atoms generates gradient-ordering phase boundaries (GOPBs), enhancing stress transfer and plastic compatibility. Strong interfacial bonding of GOPBs and the inherent stability of the dual-phase structure further enable remarkable resistance to ultrahigh-temperature softening. At 2073 K, GOPBs evolve into fully coherent interfaces, ensuring exceptional thermal stability at ~0.7 Tm. This work demonstrates a gradient-ordering strategy for achieving strength-plasticity synergy from ambient to ultrahigh temperatures.