| The Instability of Superplastic Deformation in P/M and I/M 7475 Aluminium Alloys. (1998) | |||||||||
Abstract | |||||||||
| Superplastic deformation has been studied in P/M and I/M 7475 aluminum alloys. The P/M alloy showed superplastic elongations greater than 500% at strain rates from 10(-2) to 10(0)/s and at 723-798 K, with maximum elongation of 1200% occurring at 788 K for a strain rate of 7x10(-2)/s, two orders of magnitude higher than the I/M alloy. This is due to a fine grain size of approximately 2 microns developed by dynamic recrystallization during the early stage of superplastic flow. The deformation in P/M 7475 follows in an unstable manner from small strains to failure. | |||||||||
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