• Self-diffusion considerations inω-phase of hard HCP metals

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    • Keywords


      Hard hcp metals; vacancy diffusion; correlation factor; omega phase; self-diffusion

    • Abstract


      Hard hcp metals like Zr and Ti undergoω-phase transformation under high pressures. Ample experimental evidence to suggest that this phase can be retained under ambient conditions of temperature and pressure is also available. The structural implications of the phase, consisting of two inequivalent lattices with different co-ordination numbers and nearest neighbour distances, impose certain restrictions on atomic migrationvia lattice vacancies. The present paper describes the configurational problems associated with vacancies, and also gives a calculation for correlation factor for self-diffusion taking into account the lattice anisotropy of theω-structure.

    • Author Affiliations


      M N Vijayakumar1

      1. Metallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay - 400 085, India
    • Dates

  • Bulletin of Materials Science | News

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