High temperature deformation behaviour of Al-Fe-V-Si alloys

Abstract

The high temperature deformation behaviour of three rapidly solidified dispersion strengthened Al-Fe-V-Si materials with three different compositions has been investigated. The three materials contain high volume fractions, ranging from 16 to 36%, of small round dispersoids. The stress exponent and the activation energy for deformation are anomalously high and are temperature dependent. The material with the highest volume fraction of dispersoids showed the highest stress exponent dependence on temperature. At the same time, microstructural characterisation revealed that this material becomes heterogeneous and loses creep resistance as a result of microstructural changes. A correlation is found between the stress exponent and the microstructural changes. A ‘skeleton line’is defined for creep behaviour analysis which allows comparison of the investigated materials and contributes to their characterisation.