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

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 temperat...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 387; pp. 222 - 226
Main Authors Starink, M.J., Gao, N., Yan, J.L.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.12.2004
Subjects
Al–Cu–Mg alloys
Calorimetry
Clusters
Natural ageing
Precipitation
Clusters
Calorimetry
Al–Cu–Mg alloys
Precipitation
Natural ageing
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2004.01.085