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对U720Li合金的高温变形行为进行了系统的研究。通过对该合金高温变形过程中力学行为特征及组织演变规律的分析与计算,得出了不同应变速率、不同变形温度下应变速率敏感性指数m值、变形激活能Q值和晶粒指数P值的变化规律。分别绘制动态材料模型热加工图及包含位错数量的U720Li合金高温变形机理图。应用动态DMM热加工图分析了合金的适合加工区间。运用U720Li合金高温变形机理图,根据不同温度下U720Li合金柏氏矢量补偿的晶粒尺寸、模量补偿的应力值预报了该合金的高温变形机理。
The high temperature deformation behavior of U720Li alloy was studied systematically. Through the analysis and calculation of mechanical behavior and microstructure evolution during the high temperature deformation process, the strain rate sensitivity index m, deformation activation energy Q and grain index P at different strain rates and deformation temperatures were obtained. The law of change. Draw the dynamic material model of the hot working diagram and the number of dislocations U720Li alloy high temperature deformation mechanism diagram. The application of dynamic DMM hot working diagram analysis of the alloy suitable processing interval. The mechanism of high temperature deformation of U720Li alloy was predicted based on the grain size and modulus-compensated stress values of U720Li alloy at different temperatures.