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The origins of room temperature hardening of Al–Cu–Mg alloys

By M.J. Starink, N. Gao and J.L. Yan

Abstract

The most commonly cited mechanisms for the rapid age hardening of Al–Cu–Mg alloys at about 100–200 °C are hardening by Guinier–Preston B zone formation, formation of Cu–Mg co-clusters and a dislocation–solute interaction mechanism. New experiments on ageing–deformation–ageing cycles at room temperature indicate that no substantial additional age hardening occurs with the addition of deformation to the cycle, and hence, a dislocation–solute interaction mechanism appears unlikely. Instead, strengthening due to modulus hardening generated by the difference in shear modulus of Cu–Mg co-clusters and matrix is proposed as the main strengthening mechanism for room temperature hardening

Topics: TN
Year: 2004
OAI identifier: oai:eprints.soton.ac.uk:22850
Provided by: e-Prints Soton
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