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

Tetsuya Matsunaga, Tatsuya Kameyama, Kohei Takahashi, Eiichi Sato

研究成果: Article査読

36 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2858-2864
ページ数7
ジャーナルMaterials Transactions
50
12
DOI
出版ステータスPublished - 2009 12

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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