Abstract
This work investigates the strain rate dependence of dynamic recrystallization behaviour of high-purity zinc in room temperature compression under strain rates of 10-4 s-1,10-2 s-1 and 0.5 s-1.Results from electron backscatter diffraction provide insight into the deformation and dynamic recrystallization mech-anisms operative.Continuous dynamic recrystallization,twin-induced dynamic recrystallization,and discontinuous dynamic recrystallization are all active under compressive deformation at room temper-ature.Due to the high stacking fault energy of Zn,continuous dynamic recrystallization is the dominant mechanism while discontinuous dynamic recrystallization only operates in the early stages of compres-sion at 10-4 S-1.Dynamic recrystallization kinetics are enhanced at higher strain rates(10-2 s-1 and 0.5 s-1)due to an increased contribution from twin-induced dynamic recrystallization.The present study reveals that the controlling mechanisms for continuous dynamic recrystallization are basal<a>slip and 2nd order pyramidal<c+a>slip activity.Because the activation of slip systems is mainly deter-mined by crystallographic orientation,continuous dynamic recrystallization behaviour varies with grain orientation according to their propensity for basal and 2nd order pyramidal slip.
基金项目
Centre for Microscopy and Microanalysis(CMM)at The Uni-versity of Queensland is acknowledged for their technical support()
Authors are grateful to the financial support from the Queens-land Centre for Advanced Materials Processing and Manufacturing(AM(IH150100024)
C.Wang and S.Yu acknowl-edge the financial support from the Key Research and Development Program of Shaanxi Province(2019ZDLSF03-06)
NETL
NSTL
维普
万方数据