Dynamic Recrystallization of Mg-8Gd-3Y-1Nd-0.5Zr Alloy during Hot Deformation

Abstract:

Uniaxial hot compression was conducted on Gleeble-3500 thermo simulation machine. Based on stress-strain curves, the constitutive relationship and the dynamic recrystallization kinetics model of Mg-8Gd-3Y-1Nd-0.5Zr were established. Simultaneously, dynamic recrystallization mechanism of this alloy under different deformation condition was investigated by SEM, EBSD and OM. The critical strain equation and the dynamic recrystallization kinetics model were obtained. The results showed that the dynamic recrystallization volume fraction increased with the increasing of the strain.The twin dynamic recrystallization (TDRX) was the mainly DRX mechanism at 350°C;the dynamiac recrysallization mechanism was dominated by continuous dynamic recrystallization (CDRX) at 400°C and 450°C. At higher temperature (500°C), the dynamic recrystallization was dominated by discontinuous dynamic recrystallization (DDRX) with a small amount of CDRX.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 311-322
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.311
• Online since: June 2017
• Authors: Hong Na Qi*, Zhi Min Zhang, Jian Min Yu, Xue Yan Yin, Zhi Yuan Du
• Keywords: Dynamic Recrystallization Mechanism, Kinetics Model, Mg-8Gd-3Y-1Nd-0.5Zr Alloy, Work-Hardening Rate

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