(1. 淮海工學院 機械工程學院，連云港 222005；2. 江蘇省海洋資源開發(fā)研究院，連云港 222005；
3. 華北水利水電學院 軟件學院，鄭州 450011；4. 湖南科技大學 機電學院，湘潭 411201；
5. 湖南大學 材料科學與工程學院，長沙 410082)
摘 要: 采用噴射沉積工藝制備SiCp/Al-8.5Fe-1.3V-1.7Si復合材料板坯，并通過楔形壓制后多道次熱軋制備復合材料板材。研究板坯在楔形壓制和軋制過程中孔洞、SiC分布、彌散粒子的變化和SiC-Al界面特征，并通過X射線衍射和能譜分析板坯材在致密化過程中的物相組成。結果表明，楔形壓制工藝能使噴射沉積板坯有效致密化，且能使SiC顆粒均勻分布；板坯經(jīng)480 ℃下多道次楔形壓制和多道次軋制后，彌散粒子依然保持在60~150 nm，未見明顯長大，且未向Al13Fe4等平衡相轉變，SiC-Al界面處存在一層平直的、寬度為3~5 nm的過渡層，界面干凈且沒有缺陷，納米過渡層可以提高界面潤濕性；楔形壓制后再軋制板材在拉伸過程中的斷裂表面呈SiC顆粒限制下的韌性斷裂方式，隨拉伸溫度的升高SiC-Al界面強度降低，當拉伸溫度低于200 ℃時，SiC顆粒的拔斷為主要裂紋源，當拉伸溫度高于200 ℃時，SiC-Al界面脫粘為主要裂紋源。
關鍵字: 耐熱鋁合金；復合材料；噴射沉積；楔形壓制；軋制
（1. College of Mechanical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China;
2. Jiangsu Marine Resources Development Research Institute, Lianyungang 222005, China;
3. College of Software, North China University of Water Resources and Electric Power, Zhengzhou 450011, China;
4. College of Electromechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
5. College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:SiCp/Al-8.5Fe-1.3V-1.7Si composite prepared by spray deposition was densified by wedge pressing, and then was hot-rolled into sheets. The evolutions of pore, SiC particles distribution, second-phase dispersions during wedge pressing and SiC/Al interface of composite sheet as-rolled were observed. The phase compositions of composite plate blank during densification process were analyzed by X-ray diffraction and energy spectrum. The results show that the composite plate blank can be densified by wedge pressing, and homogeneous SiC particle distribution can be obtained. The dispersions keep fine with 60-150 nm in diameter from growing obviously and transforming into equilibrium phase such as Al13Fe4 during the wedge pressing and rolling at 480 ℃. A clean SiC-Al interface without defect of the composite sheet as-rolled can be seen, which contributes to the wettability between SiC particle and Al matrix. The tensile fracture surface of the composite as-rolled is characterized with a ductile rupture mechanism under the restriction of SiC particles. The bonding between SiC particle and Al matrix becomes week as tensile temperature increases. Cracks nucleate in the SiC particles as tensile temperature is below 200 ℃, while cracks nucleate along SiC-Al interface as tensile temperature increases up to 200 ℃.
Key words: heat resistant aluminium alloy; composite; spray deposition; wedge pressing; rolling
