Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics

Galindo-Nava, E. I. and Torres-Villaseñor, G. and Rivera-Díaz-Del-Castillo, P. E J (2015) Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics. Materials Science and Technology (United Kingdom), 31 (6). pp. 677-687. ISSN 0267-0836

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Abstract

Plastic deformation by grain boundary sliding in superplastic alloys is described by a novel thermostatistical approach. The Gibbs free energy for cavity formation at moving grain boundaries is obtained. It equals the competition between the stored energy at the boundaries and the energy dissipated by grain boundary sliding. The latter is approximated by an entropy term induced by moving dislocations to facilitate boundary displacement. Strength loss evolution is estimated from the cavity evolution rate. The theory describes superplastic behaviour of Zn22Al, Zn21Al2Cu and Mg3Al1Zn for various temperatures, strain rates, grain sizes, and specimen geometries. Transition maps are defined for finding the optimal conditions for achieving superplastic behaviour in terms of composition, temperature, geometry and strain rate.

Item Type:
Journal Article
Journal or Publication Title:
Materials Science and Technology (United Kingdom)
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2210
Subjects:
ID Code:
125585
Deposited By:
Deposited On:
25 May 2018 13:40
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 11:21