On the enhanced grain growth in ultrafine grained metals
- Institut National Polytechnique de Grenoble, Saint Martin d`Heres (France). Genie Physique et Mecanique des Materiaux
The static grain growth has been investigated in ultrafine grain and copper with an initial grain size of 160 nm. It has been revealed that its kinetics follows to normal grain growth behavior, but a grain growth starts at a relatively low temperature (0.32 T{sub m}). Good fits with experimental data for several ultrafine grained metals have been obtain if the activation energy for grain boundary diffusion is assumed to be lower than for coarse grained materials, but increases during grain growth. It is suggested that this unusual behavior of the activation energy is caused by the presence of non-equilibrium grain boundaries in ultrafine grain materials and their recovery during heating.
- OSTI ID:
- 131508
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 11 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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