SiC颗粒增强铝基复合材料的热成形性能与热加工图

Workability and Processing Map of SiC Particle Reinforced Aluminum Matrix Composites at High Temperature and Strain Rate

通过热压缩试验,研究了SiC颗粒增强铝基复合材料在应变速率为0.001～1s-1,变形温度为713～773K的热成形性能。结果表明:所研究复合材料的真应力随变形温度的升高、应变速率的降低而降低,同时采用Zener-Hollomon参数对其热变形方程进行了研究,建立了铝基复合材料的热变形方程,并综合考虑应变速率与温度的影响,采用动态材料模型建立了所研究复合材料的热加工图,同时根据Malas’s稳定性准则确定了其非稳定变形区的范围。

The deformation behavior of the aluminum reinforced with 15% SiC particle composites was investigated by hot compression test at different strains, strain rates and temperature. During the analysis, the flow stress curves were obtained at 713-773 K and 0.001-1 sl, meanwhile the constitutive equation for the flow stress was given. Considered the effects of deformation temperature and the strain rate, the processing map was calculated to evaluate the efficiency of the forging process in the range of temperature and strain rates and to recognize the instability zone of flow behavior. At the same time, all the zones of deformation were studied through optical and electronic microscopy to describe the behavior of the material under the hot workability.