Abstract
In the automotive industry, there is considerable interest in replacing steel with aluminum in autobody sheet-metal parts to improve fuel efficiency and environmental requirements. Some important issues associated with the use of aluminum in transportation include cost, formability, corrosion resistance and strength. The present investigator suggested that the dislocation substructure, ductility and activation parameters are strongly dependent on the solute-dislocation interaction at intermediate temperatures in many alloys including Al-Mg alloys. The basic mechanism for solute-dislocation interaction may not change with temperature in an alloy although its effect and significance may vary with temperature. In this study, the solute-dislocation interaction model of the present investigators was applied to the high temperature region where the superplasticity is observed to examine the possible effect of solution strengthening on the superplastic behavior of Al-Mg alloys.
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