摘要
The hot deformation behavior and microstructure evolution of as-cast and extruded ZE41A magnesium alloy were studied using processing maps. The compression tests were conducted on both as-cast and extruded alloys in the temperature range of 250-450 ℃ and strain rate range of 0.001-1.0 s^-1 to establish the processing map. The dynamic recrystallization （DRX） and instability zones were identified and validated through micrographs. The extruded ZE41A magnesium alloy shows higher flow stress, higher efficiency and lower instability regimes than as-cast alloy. The extruded ZE41A magnesium alloy achieves good hot workability due to grain refinement, decrease in porosity, hardening and strengthening of the material.
采用热加工图研究铸态和挤压态ZE41A镁合金的热变形行为和组织演变。在温度250-450℃,应变速率0.001-1.0s-1的条件下,对铸态和挤压态合金进行抗压测试,建立热加工图。通过显微组织观察确定动态再结晶和不稳定区域。挤压态ZE41A镁合金比铸态合金具有较高的流变应力,较高的能量损耗率和较小的不稳定区域。由于晶粒的细化、材料孔隙度的降低、硬化和强化,挤压态镁合金具有良好的热加工性能。
