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<p>Refractory complex concentrated alloys (RCCAs) attract significant attention due to unique microstructure and properties, yet limited strain hardening capacity (≤100 MPa) restricts applications. This work proposes a novel strategy leveraging inherent nanoscale compositional fluctuations with controlled phase-separation thermodynamics to achieve superior strain hardening via confined nano-martensite transformation. Short-time annealing (750 °C, 1 min) after 90% cold rolling for single-phase Ti<sub>2</sub>ZrTa<sub>0.75</sub> RCCA triggers compositional partitioning into Ta-rich matrix and dispersed ~15 nm Ta-poor phases. The nanosized low-stacking-fault-energy (SFE) Ta-poor regions containing minor 1-2 nm quench-induced α″ martensite phases serve as nucleation sites for stress-induced α″ martensite during tensile deformation. Crucially, α″ martensite growth is spatially confined to the 15 nm low-SFE domain limit by surrounding high-SFE regions, generating abundant nano-α″/matrix interfaces. High-interfacial-density-induced strain concentration coupled with dislocation interactions delivers a 527 MPa work hardening capacity in RCCAs.</p>

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Superior strain hardening in refractory complex concentrated alloys via confined nano-martensite transformation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月10日

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  • Jingzhi He,
  • Hongyang Liu,
  • Bohang Shen,
  • Shun Li,
  • Yu Tang,
  • Jiayu Dai,
  • Shuxin Bai

摘要

Refractory complex concentrated alloys (RCCAs) attract significant attention due to unique microstructure and properties, yet limited strain hardening capacity (≤100 MPa) restricts applications. This work proposes a novel strategy leveraging inherent nanoscale compositional fluctuations with controlled phase-separation thermodynamics to achieve superior strain hardening via confined nano-martensite transformation. Short-time annealing (750 °C, 1 min) after 90% cold rolling for single-phase Ti2ZrTa0.75 RCCA triggers compositional partitioning into Ta-rich matrix and dispersed ~15 nm Ta-poor phases. The nanosized low-stacking-fault-energy (SFE) Ta-poor regions containing minor 1-2 nm quench-induced α″ martensite phases serve as nucleation sites for stress-induced α″ martensite during tensile deformation. Crucially, α″ martensite growth is spatially confined to the 15 nm low-SFE domain limit by surrounding high-SFE regions, generating abundant nano-α″/matrix interfaces. High-interfacial-density-induced strain concentration coupled with dislocation interactions delivers a 527 MPa work hardening capacity in RCCAs.