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Trifunctional local-range order oxygen structure enhanced strength-ductility and fatigue resistance in large-scale metastable titanium alloy

Author

Listed:
  • Yamei Mao

    (Chang’an University)

  • Qinyang Zhao

    (Chang’an University)

  • Runqi Zhang

    (Northeastern University
    Northwest Institute for Non-ferrous Metal Research)

  • Ping Guo

    (Northwest Institute for Non-ferrous Metal Research)

  • Yongnan Chen

    (Chang’an University)

  • Yongqing Zhao

    (Chang’an University
    Northwest Institute for Non-ferrous Metal Research)

Abstract

Research on high-performance Ti alloys incorporating oxygen (O) has remained a laboratory procedure and is hindered by the unresolved issue of O segregation-driven failure. Here, we demonstrate that O can tailor a nanoscale local range order O (LRO-O) structure between the oxide and random interstitials in Ti alloy. We introduce 0.36 wt% O into metastable Ti-5Al-5Mo-5V-3Cr alloy using a short-term powder metallurgy approach to produces large-scale materials. The LRO-O structure in designed alloy prevents crack initiation by promoting the active nucleation of -type dislocations and altering the slip modes during tensile and fatigue failure. The alloy has high strength (1.7 GPa), elongation (7.9%), and fatigue strength (1058.3 MPa), which outperforms many high-strength, high-O Ti alloys. Our findings provide a scalable, practical route to superior mechanical properties for Ti alloys without costly alloying elements.

Suggested Citation

  • Yamei Mao & Qinyang Zhao & Runqi Zhang & Ping Guo & Yongnan Chen & Yongqing Zhao, 2025. "Trifunctional local-range order oxygen structure enhanced strength-ductility and fatigue resistance in large-scale metastable titanium alloy," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-62646-5
    DOI: 10.1038/s41467-025-62646-5
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