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 language | English |
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Pages (from-to) | 2858-2864 |
Number of pages | 7 |
Journal | Materials Transactions |
Volume | 50 |
Issue number | 12 |
DOIs | |
Publication status | Published - 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