HIGH-TEMPERATURE DEFORMATION-BEHAVIOR OF AL-FE-V-SI ALLOYS

The high temperature deformation behaviour of three rapidly solidified dispersion strengthened Al-Fe-V-Si materials with three different com positions has been investigated. The three materials contain high volu me fractions, ranging from 16 to 36%, of small round dispersoids. The stress exponent and the activation energy for deformation are anomalou sly high and are temperature dependent. The material with the highest volume fraction of dispersoids showed the highest stress exponent depe ndence on temperature. At the same time, microstructural characteristi cs revealed that this material becomes heterogeneous and loses creep r esistance as a result of microstructural changes. A correlation is fou nd between the stress exponent and the microstructural changes. A 'ske leton line' is defined for creep behaviour analysis which allows compa rison of the investigated materials and contributes to their character isation.