MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Constitutive Relation for Ambient-Temperature Creep in Hexagonal Close-Packed Metals
Tetsuya MatsunagaTatsuya KameyamaKohei TakahashiEiichi Sato
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2009 Volume 50 Issue 12 Pages 2858-2864

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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.

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© 2009 The Japan Institute of Metals and Materials
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