摘要
研究了AZ31镁合金轧制板材在不同温度（423～523K）以及不同应变速率（0．001～0．01／s）下的力学性能和变形机制。结果表明，材料的塑性随着温度的升高和应变速率的降低而增加，表现出一定的应变速率敏感性。当温度在动态再结晶温度以下时，材料的塑性变形主要是：孪生、位错滑移。随着温度的提高，在孪生区域和晶界处可以观察到许多动态再结晶晶粒，这表明在变形过程中同时发生了孪生诱发动态再结晶和连续动态再结晶。
The mechanical properties and deformation mechanisms of hot-rolled AZ31 magnesium alloy have been studied by tension testing at different temperatures （423 -523 K） and different strain rates （0. 001 - 0.01/s）. The experimental results show that the plasticity of the material increases with the rise of the temperature and the decrease of the strain rate, revealing certain strain rate sensitivity. Twinning and dislocation slip have been proven to be the dominant model of plastic deformation when the temperature is below dynamic recrystallization temperature. With the temperature＇ s increase, some recrystallized grains can be observed at the twinned regions and grain boundaries, suggesting both twinning induced dynamic recrystallization and continuous dynamic recrystallization occurred in the deformation process.
出处
《矿冶工程》
CAS
CSCD
北大核心
2008年第6期97-100,共4页
Mining and Metallurgical Engineering
关键词
镁合金
中温变形性能
塑性
孪生
位错滑移
动态再结晶
magnesium alloys
deformation behavior at moderate temperature
plasticity
twinning
dislocation slip
dynamic recrystallization
