(1. 淮海工學(xué)院 機(jī)械工程學(xué)院，連云港 222005；2. 淮海工學(xué)院 人事處，連云港222005;
3. 湖南科技大學(xué) 機(jī)電學(xué)院, 湘潭 411201；4. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082)
摘 要: 采用噴射沉積工藝制備SiCp/Al-Fe-V-Si復(fù)合材料，并通過(guò)熱壓和熱軋工藝對(duì)沉積坯進(jìn)行致密化；通過(guò)高分辨電鏡觀察其SiC/Al界面形貌，并對(duì)比熱暴露后的界面形貌。結(jié)果表明：復(fù)合材料主要存在兩種SiC/Al界面，一種是厚度為3 nm左右的晶態(tài)Si界面層，且在界面附近的基體中生成細(xì)小的Al4C3相；另一種是厚度為5 nm的非晶態(tài)SiO2界面層，部分溶解的SiC顆粒向附近Al基體中注入游離態(tài)的Si，在界面附近形成Si的濃度梯度；兩種界面都具有良好的潤(rùn)濕性，界面結(jié)合強(qiáng)度高；經(jīng)640 ℃熱暴露10 h后，SiC/Al界面處生成的粗大Al4C3脆性相降低界面結(jié)合強(qiáng)度，從而降低復(fù)合材料的力學(xué)性能。
關(guān)鍵字: 耐熱鋁合金；Al-Fe-V-Si復(fù)合材料；SiC顆粒；噴射沉積；界面
reinforced with SiC particles
（1. College of Mechanical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China;
2. Department of Human Resource, Huaihai Institute of Technology, Lianyungang 222005, China;
3. College of Electromechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
4. College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:SiCp/Al-Fe-V-Si composites were prepared by spray deposition, and the as-deposited preforms were hot pressed and subsequently rolled. The SiC/Al interface of the as-rolled composite sheets was observed by high resolution transmission electron microscopy (HRTEM). The results show that there are two kinds of SiC/Al interfaces in the composites. One is crystalline silicon transition layer with about 3 nm in thickness, and some dispersed Al4C3 phases appear in the matrix near the interface. And the other one is amorphous silica layer with about 5 nm in thickness and SiC particles solve partly to inject Si into the matrix, resulting in Si concentration gradient. Both of the two kinds of interfaces are characterized with good wettability, which contributes to the strong bonding between SiC particles and Al matrix. Coarse Al4C3 phases appear at the SiC/Al interface for the composite exposed at 640 ℃ for 10 h, which result in the interface weakening followed by decrease of the composite strength.
Key words: heat resistance aluminium alloy; Al-Fe-V-Si composite; SiC particle; spray deposition; interface
