, 熱變形行為
(中國科學院 金屬研究所 先進陶瓷與金屬基復合材料研究室，
沈陽 110016)
摘 要: 在變形溫度分別為300, 350, 400, 450, 500℃, 應變速率分別為0.02, 0.1, 0.5s-1, 高徑比分別為1和2的變形條件下，采用Gleeble-1500熱模擬試驗機對17%SiCp/2024Al(體積分數(shù))復合材料的熱變形行為進行了研究。結(jié)果顯示：復合材料的流變應力隨變形溫度的升高、應變速率的降低而降低；在不同的變形溫度、應變速率和高徑比的條件下，復合材料表現(xiàn)出不同的加工硬化和軟化行為。進一步的分析表明：復合材料的形變過程中，加工硬化過程受滲透力的影響，主要取決于變形溫度；軟化過程取決于同時存在的動態(tài)回復和動態(tài)再結(jié)晶過程。
關鍵字: 碳化硅顆粒；復合材料；熱變形行為；滲透力；應變速率
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
