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中文摘要：
采用数值模拟和试验方法研究了变形镁合金ZK60管材挤压成形组织演变规律。根据材料热模拟试验结果,得到了ZK60镁合金动态再结晶组织演变的Yada模型中的相关系数。结果表明,当挤压速度增大时,挤压管材晶粒尺寸减小,变化规律接近线性。当挤压温度增大时,挤压管材晶粒尺寸增大。挤压比增大时,晶粒尺寸减小。晶粒尺寸数值模拟结果与试验结果吻合,最大相对误差小于16%。当温度在300～360℃时,ZK60镁合金发生了完全动态再结晶,晶粒较小且组织均匀,平均晶粒尺寸是原始晶粒尺寸的38%。
英文摘要：
Microstructure evolvement of ZK60 magnesium alloy during tube hot extrusion had been studied by simulation and experiment.According to true stress-strain data,coefficients of Yada model of dynamic recrystallization had been determined for ZK60 magnesium alloy.Simulation results presented that the grain of extruded tube fined with increasing of extrusion speed,and the regularity was nearly linear.The grain of extruded tube was coarsing with increasing of extrusion temperature,and the grain fined with increasing of extrusion ratio.The results of simulation had been agreement with that of experiment,and the relative errors were less than 16%.When the extrusion temperature is 300-360 ℃,the dynamic re-crystallization had occurred completely,and the grain was fine and uniform.The grain of extruded tube was fined by 38% of original grain.
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