CAJ | 학술논문

采用Gleeble-1500热模拟实验机，对挤压态AZ80镁合金在变形温度为250~450℃和应变速率为0.001~10 s-1条件下进行热压缩塑性变形。将实验得到的流变应力经过温度修正后，分析该合金的应变速率敏感指数，构建其本构方程，并研究其发生动态再结晶的临界点。结果表明：低温低应变速率下变形时，AZ80镁合金的应变速率敏感指数较高；低温高应变速率下变形时，应变速率敏感指数较低；应变速率提高和温度降低都会导致发生动态再结晶的临界应变增大。
채용Gleeble-1500열모의실험궤，대제압태AZ80미합금재변형온도위250~450℃화응변속솔위0.001~10 s-1조건하진행열압축소성변형。장실험득도적류변응력경과온도수정후，분석해합금적응변속솔민감지수，구건기본구방정，병연구기발생동태재결정적림계점。결과표명：저온저응변속솔하변형시，AZ80미합금적응변속솔민감지수교고；저온고응변속솔하변형시，응변속솔민감지수교저；응변속솔제고화온도강저도회도치발생동태재결정적림계응변증대。
The hot compression deformation test of extruded AZ80 magnesium alloy was conducted using a Gleeble-1500 stimulator, with the temperature ranging from 250℃to 450℃and the strain rate varying from 0.001 s-1 to 10 s-1. After the correction of the flow stress at different deformation conditions caused by deformation heat, the strain rate sensitivity of as-extruded AZ80 magnesium alloy was investigated, the constitutive equation was established and the critical parameters for dynamic recrystallization were determined. The results show that the strain rate sensitivity is relatively high at low strain rate and low temperature and relatively low at high strain rate and low temperature, and that the critical strain for dynamic crystallization in as-extruded AZ80 magnesium alloy increases with increasing strain rate or decreasing temperature.