復(fù)合材料的斷裂行為
(1. 淮海工學(xué)院 機械工程系，連云港 222005；
2. 張家界航空工業(yè)職業(yè)技術(shù)學(xué)院 機械工程系，張家界 427000；
3. 淮海工學(xué)院 人事處，連云港222005；
4. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082)
摘 要: 采用噴射沉積工藝制備SiCP/Al-11.7Fe-1.15V-2.4Si復(fù)合材料，并通過熱壓工藝對復(fù)合材料進行致密化，再通過熱軋加工成板材。對復(fù)合材料的顯微組織以及不同溫度下復(fù)合材料的斷裂性能和斷口形貌進行研究。結(jié)果表明：采用熱壓致密后再熱軋工藝能使SiC顆粒分布均勻，長軸方向平行于軋制方向，有利于增強復(fù)合材料的力學(xué)性能，復(fù)合材料的斷裂性能和斷面形貌與拉伸溫度以及SiC的分布和取向相關(guān)，隨著拉伸溫度升高，SiC/Al界面強度減弱，拔斷的SiC顆粒逐漸減少，SiC顆粒的拔出成為主要的裂紋源；與基體金屬不同的是，復(fù)合材料的塑性隨著溫度升高而降低。
關(guān)鍵字: SiC顆粒；耐熱合金；復(fù)合材料；噴射沉積；斷裂行為
（1. College of Mechanical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China;
2. Department of Mechanical Engineering, Zhangjiajie Institute of Aviation Industry Vocational,
Zhangjiajie 427000, China;
3. Department of Human Resource, Huaihai Institute of Technology, Lianyungang 222005, China;
4. College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:SiCP/Al-11.7Fe-1.15V-2.4Si composite was prepared by spray deposition and densified by hot pressing, and then were rolled into sheets. The microstructures, fracture properties and fractographies of the composite at different tensile temperatures were investigated. The results show that the uniform distribution of the SiC particles with their longitudinal direction parallel to the rolling direction is achieved by rolling after hot pressing, which contributes to the elevation of the mechanical properties of the composite. Fracture properties and fractographies of the composite are affected by the tensile temperature and distribution and orientation of SiC particles. The bonding between SiC particles and the matrix becomes weak, and the breakable particles reduce as the tensile temperature; the debonding of SiC/Al becomes the dominant fracture mechanism, the plasticity of the composite decreases as the tensile temperature increases, which is different from the matrix alloy.
Key words: SiC particle; heat resistant alloy; composite; spray deposition; fracture behavior
