Science of Sintering 2013 Volume 45, Issue 2, Pages: 199-208
https://doi.org/10.2298/SOS1302199X
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Study on critical damage factor and the constitutive model including dynamic recrystallization softening of AZ80 magnesium alloy
Xue Y. (School of Material Science and Engineering, North University of China, Taiyuan, China)
Zhang Z.M. (School of Material Science and Engineering, North University of China, Taiyuan, China)
Wu Y.J. (School of Material Science and Engineering, North University of China, Taiyuan, China)
Quantities AZ80 magnesium alloy billets were compressed with 60 % height
reduction on hot process simulator at 473, 523, 573, 623, 673, 723 K under
strain rates of 0.001, 0.01, 0.1, 1 and 10 s-1. In order to predict the
occurrence of surface fracture, the critical damage factor based on the
Cockcroft-Latham equation were obtained by analysing the results of the
corresponding finite element calculation. The results show that the critical
damage factor at 523, 573, 623, 673 K under strain rates of 0.001, 0.01, 0.1
and 1 s-1 is not a constant but varies in a range from 0.1397 to 0.4653.
Meanwhile, a constitutive model with a few parameters is used to characterize
the dynamic recrystallization strain softening of AZ80 alloy, which
comprehensively reflect the effects of the deformation temperature, strain
and strain rate on the flow stress.
Keywords: AZ80 magnesium alloy, critical damage factor, constitutive model, dynamic recrystallization, strain softening