Effect of Surface and Grain Boundary on the Reversion of Al-Zn Alloys

Abstract:

Age-hardening of Al-Zn alloy after quenching develops inhomogeneously due to the effect of surface as a vacancy sink and grain boundary as an easy path. In this study, reversion of the age-hardened Al-Zn alloys, in which ellipsoidal GP zones were formed, was investigated by Vickers micro-hardness test. Ellipsoidal GP zones were reverted more quickly near the surface and grain boundary than in the interior, as spherical GP zones in Al-10%alloy did. It is considered that the surface and grain boundary plays a role of effective source for vacancies, in addition to the interior source such as dislocations, as in the case of the reversion of spherical GP zones.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 1211-1216
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.1211
• Online since: June 2014
• Authors: Keiyu Nakagawa*, Teruto Kanadani
• Keywords: Aging, Al-Zn Alloy, GP Zone, Grain Boundary, Reversion, Surface, Vacancy

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