SiC颗粒增强Al基复合材料的动态再结晶模型

Dynamic Recrystallization Model of SiC Particle Reinforced Aluminum Matrix Composites

采用Gleeble-1500热模拟试验机研究15%SiC颗粒增强铝基复合材料在温度为713～773K、应变速率为0.001～1s-1的热变形行为,并建立热变形本构方程;同时采用Quantiment-500型自动图形分析仪测量该材料的动态再结晶晶粒尺寸。在研究中,以试验数据为基础,建立θ-σ和θ/-σ–σ曲线,从而进一步获得动态再结晶的临界应变和稳态应变,并通过试验数据的回归分析,建立动态再结晶的临界应变模型和稳态应变模型,并在此基础上,获得所研究材料的动态再结晶图。

The hot deformation and dynamic recrystallization （DRX） behavior of 15%SiC particle reinforced aluminum matrix composites were studied through isothermal compression test at the temperature of 713-773 K and the strain rate of 0.001-1 s^-1; the hot deformation constitutive equation was established. Meanwhile,DRX grain size of the composites was measured by a Quantiment-500 automatic image analyzer. In the study,θ-σand θ/σ–σ curves were plotted based on the experimental data to further obtain the critical strain and steady strain of DRX. Then the critical strain model and the steady strain model of DRX were set up by regression analysis of experimental data. Based on the results,the diagram of DRX for SiC particle reinforced aluminum matrix composites was given.