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Ultrahigh strength and ductile titanium composites enabled by nanoscale reinforcement and heterostructure engineering
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DOI：10.1080/21663831.2026.2704663.png)
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Abstract
En 中文
Overcoming the strength–ductility trade-off remains a central challenge for titanium matrix composites, because ceramic reinforcements often induce severe interfacial stress concentration and premature cracking. Here, we develop a hierarchical heterostructure in Ti–6.5Al–2Zr–1Mo–1 V through in-situ reaction and subsequent hot extrusion, consisting of nanoscale TiB reinforcements, primary α, β phase and secondary α. The pronounced hetero-deformation-induced strengthening and activation of ⟨c + a ⟩ dislocations enable the composite to achieve 1351 MPa tensile strength and 15.9% elongation, representing increases of 40.1% and 26.2% over the matrix alloy, respectively. This strategy offers a scalable route for designing high-performance titanium composites.
αp, β, autocatalytic αs and in-situ-formed nanoscale TiB jointly constitute the HHS composite.
The HHS delivers 1351 MPa tensile strength and 15.9% elongation.
Multiple deformation mechanisms collectively sustain the work-hardening capacity.
TiB-assisted strain accommodation alleviates local stress concentration.
Keywords:
Titanium matrix composites
nanoscale TiB
heterostructure engineering
⟨c+a⟩ dislocation
TiB-assisted strain accommodation
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