1 School of Mechanical Engineering, Shandong University of Technology, Zibo 255049; 2 School of Material Science and Engineering, Harbin Institute of Technology, Weihai 264209; 3 Department of Fundamental Experiment, Naval Aeronautical Engineering Institute, Yantai 264001
Abstract: The annealing experiment of the hot-rolled ZK61 magnesium alloy plates was carried out under different annealing temperature and holding time. The microstructure was observed by optical microscope (OM), and the mathematical model for the relationship among the grain size, annealing temperature and holding time was established to investigate the grain growth behavior of hot-rolled ZK61 magnesium alloy. The results indicate that the increasing annealing temperature and the extending holding time can lead to the coarsened grain. In addition, annealing temperature apparently has a greater effect on the grain growth than holding time. The relationship between the grain size and holding time of ZK61 magnesium alloy in the temperature range of 250-450 ℃ can be well interpreted by the kinetic equation, Dn-D0n=kt, where k=k0exp[-Qg/(RT)]. And the calculated grain growth exponent (n) and the activation energy (Qg) are about 3.5 and 45 kJ/mol, respectively.
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2017, Vol. 31 
