2099合金的热变形行为及组织演化Hot deformation behavior and microstructure evolution of 2099 alloy

采用热压缩试验、方差分析和TEM技术研究变形条件对2099合金流变行为的影响规律和组织演化特征。结果表明：随着应变的增加，2099合金流变应力经历了过渡变形和稳态变形两个阶段。在显著性水平为0.01条件下，变形温度和应变速率对2099合金流变应力的影响高度显著，表明该合金为正的应变速率和负的变形温度敏感性材料。且随着应变的增加、变形温度的升高和应变速率的降低，合金组织依次经历了无规则的位错缠结→多边形化→晶界弓出形核+亚晶合并→再结晶晶粒长大过程。当变形温度为460 ℃、应变速率为0.01 s^-1、应变量为1.1时，合金可获得细小的再结晶组织。

The effects of deformation conditions on flow behaviors and microstructure evolution characteristics of 2099 alloy were investigated by hot compression tests, variance analysis and TEM technology. The results show that, the flow stress of 2099 alloy experiences two stages with the increase of strains, namely, the transition deformation stage and the steady deformation stage. The effects of temperatures and strain rates on the flow stress are significant under the significance level of 0.01, which indicates that 2099 alloy is a positive strain rate sensitive and negative temperature sensitive materials. The microstructure of 2099 alloy experiences irregular dislocation tangles → polygonization → grain boundaries bulging + subgrains coalescence → dynamic recrystallization grain growth with increasing the strains and temperatures and decreasing the strain rates. And the fine recrystallized microstructure of 2099 alloy can be obtained under the deformation conditions of temperature 460 ℃, strain rate 0.01 s^-1 and stain 1.1.

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