4.7 Article

The formation of a high-strength state in martensitic Ti Grade 4 by ECAP

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Martensite formation in titanium alloys: Crystallographic and compositional effects

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Summary: The study proposes an explanation for the inhibition of martensite beyond characteristic concentration thresholds in titanium binary alloys, combining the phenomenological theory of martensite crystallography and thermodynamic calculations. It shows that martensite formation can be prevented crystallographically while still being thermodynamically favorable. By considering the influence of composition, two twinning systems and two glide systems are identified to produce the lattice invariant shear, with computed critical concentrations for martensite formation aligning well with experimental results. The method may serve as a guide for designing titanium alloys with controlled martensitic behavior.

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