Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics
AU - Galindo-Nava, E. I.
AU - Torres-Villaseñor, G.
AU - Rivera-Díaz-Del-Castillo, P. E J
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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.
AB - 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.
KW - Alloy design
KW - Cavitation
KW - Dislocations
KW - Grain boundary sliding
KW - Superplasticity
KW - Themostatistics
U2 - 10.1179/1743284714Y.0000000643
DO - 10.1179/1743284714Y.0000000643
M3 - Journal article
AN - SCOPUS:84921722537
VL - 31
SP - 677
EP - 687
JO - Materials Science and Technology (United Kingdom)
JF - Materials Science and Technology (United Kingdom)
SN - 0267-0836
IS - 6
ER -