Constitutive relation for ambient-temperature creep in hexagonal close-packed metals

Tetsuya Matsunaga, Tatsuya Kameyama, Kohei Takahashi, Eiichi Sato

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

This paper reports creep tests on three kinds of polycrystalline hexagonal close-packed metals, i.e. commercially pure titanium, pure magnesium, and pure zinc, in the vicinity of ambient temperature even below their 0.2% proof stresses. These materials showed significant steady state creep rates around 10-9 s-1 and had stress exponents of about 3.0. Arrhenius plots in the vicinity of ambient temperature indicate extremely low apparent activation energies, Q, of about 20 kJ/mol, which is at least one-fourth of the Q of dislocation-core diffusion. Ambient-temperature creep also has a grain-size effect with an exponent of 1.0. These parameters indicate that ambient-temperature creep is a new creep deformation mechanism in h.c.p. materials.

Original languageEnglish
Pages (from-to)2858-2864
Number of pages7
JournalMaterials Transactions
Volume50
Issue number12
DOIs
Publication statusPublished - 2009 Dec

Keywords

  • Ambient-temperature creep
  • Constitutive relation
  • Magnesium
  • Titanium
  • Zinc

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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