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Martensitic transformation from β to α′ and α″ phases in Ti–V alloys: A first-principles study

  • Wei Mei (a1), Jian Sun (a1) and Yufeng Wen (a2)

The ground state properties of the α′ and α″ martensitic phases and energetic pathways of the β → α′/α″ martensitic transformations in Ti–(0–30 at.%)V alloys were investigated by first-principles method in combination with virtual crystal approximation. The results show that lattice parameters with c/a of the α′ phase and lattice parameters with b/a, c/a of the α″ phase are significantly sensitive to composition, and the atomic shuffle y of the α″ phase decreases from that of the α′ phase toward that of the β phase with increasing V content in Ti–V alloys. The compositional α′/α″ phase boundary is about 10 at.% V, from the viewpoints of energetics and mechanical stability of these phases. The principal lattice strains of the β → α′ transformation are insensitive to the V content, while those of the β → α″ transformation change significantly with increasing V content. The volume variation for β → α′ increases, whereas that for β → α″ decreases with increasing V content in Ti–V alloys. The energetic pathway results show that the relative stability of the α′ and α″ phases decrease with increasing V content and temperature and that there is no energy barriers during the β → α′/α″ martensitic transformations at temperatures from 0 to 400 K.

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Contributing Editor: Susan B. Sinnott

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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
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