Temperature dependence of the optimum particle size for the dislocation detachment controlled creep of Al-Fe-V-Si/SiC p composite

Abstract

In order to improve the models for the dislocation detachment controlled creep in the dispersion strengthened alloys, the authors analyzed the creep behavior of Al-Fe-V-Si/SiC{sub p} composite based on the attractive dislocation-particle interaction with the assumption that the optimum particle radius is not a constant value but increases with increasing temperature. And in order to verify their suggestion, the creep behavior of the rapidly solidified aluminum alloys such as FVS1212 alloy and Al-8.4wt.%Fe-3.6wt.%Ce alloy is analyzed by the suggested method and they propose a good interpretation of the dislocation detachment process during creep. The unified model has been suggested to properly explain the creep behavior of dispersion strengthened aluminum alloys. This model assumes that the optimum particle radius related to the detachment process increases with increasing temperature. Using the modified creep equation, the normalized creep rate can be shown on a single line when plotted against the stress normalized by the detachment stress.