, 热变形行为
(中国科学院 金属研究所 先进陶瓷与金属基复合材料研究室，
沈阳 110016)
摘 要: 在变形温度分别为300, 350, 400, 450, 500℃, 应变速率分别为0.02, 0.1, 0.5s-1, 高径比分别为1和2的变形条件下，采用Gleeble-1500热模拟试验机对17%SiCp/2024Al(体积分数)复合材料的热变形行为进行了研究。结果显示：复合材料的流变应力随变形温度的升高、应变速率的降低而降低；在不同的变形温度、应变速率和高径比的条件下，复合材料表现出不同的加工硬化和软化行为。进一步的分析表明：复合材料的形变过程中，加工硬化过程受渗透力的影响，主要取决于变形温度；软化过程取决于同时存在的动态回复和动态再结晶过程。
关键字: 碳化硅颗粒；复合材料；热变形行为；渗透力；应变速率
carbon particulate reinforced
2024 aluminum composite
（Department of Advanced Ceramic and Metal Matrix Composite,
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China）
Abstract:The hot deformation behavior of silicon carbon p articulate reinforced 2024 aluminum composite, under the conditions that the deforming temperature is of 300, 350, 400, 450, 500℃, the strain rate is of 0.02, 0.1, 0.5s-1, and the aspect ratio is of 1 and 2, respectively, was investigated by means of Gleeble-1500 dynamic testing machine. The results indicate that the composite has different working hardening and softening behavior under the various deforming temperature an d strain rate. The results show that the working hardening behavior is affected by penetrability, which is determined by temperature, and the softening behavior is determined by the dynamic recovery and dynamic recrystallization.
Key words: silicon carbon particulate；composite；hot deformation behavior；penetrability；strain rate
