Abstract
The relation between microstructure and softening behavior was investigated in Al-8%Fe alloy extrudates which were produced through a roll quenching process. The extrudates were strengthened by dislocation structure introduced by hot extrusion at 703K. The dislocation structure remained stably even after exposure at 573K for 195h and the softening did not occure. At temperatures higher than 673K, both the transformation of metastable Al6Fe phase to stable Al3Fe phase and the recovery of dislocation structure occurred simultaneously. Hence, hardness of extrudates decreased with increasing of annealing time. At temperatures higher than 773K, softening occurred immediately but no remarkable grain growth was observable. This is explained by the pinning effect of dispersoids on grain boundary migration.
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