Al-8.5Fe-1.3V-1.7Si/SiC_P复合材料热加工工艺的研究  

Study on Hot Working Process of Al-8.5Fe-1.3V-1.7Si/SiC_P Composite

作　　者：徐政坤[1] 贺毅强[1] 陈振华[1] 尹显觉[1] 郝亮[1] 

机构地区：[1]湖南大学材料科学与工程学院

出　　处：《热加工工艺》2007年第10期17-20,24,共5页Hot Working Technology

摘　　要：研究了多层喷射沉积Al-8.5Fe-1.3V-1.7Si/SiCP复合材料的热加工工艺,以及不同工艺对其力学性能的影响。通过调整不同的工艺参数来获得最优化的工艺,并通过金相、X-射线、扫描电镜、透射电镜观察了在不同加工过程中复合材料的显微组织,分析了工艺参数对其加工性能以及最终力学性能的影响。结果表明,在490℃通过挤压后再轧制以及模压后再轧制的Al-8.5Fe-1.3V-1.7Si/SiCP复合材料具有突出的室温性能和高温性能,热压后轧制得到的板材室温抗拉强度达620 MPa,315℃下抗拉强度达300 MPa,400℃下抗拉强度为185 MPa。分析认为其突出的室温性能和高温性能主要是得益于复合材料中的颗粒状SiC与基体的结合状况良好以及材料中弥散析出的Al13(Fe,V)3Si相、喷射沉积工艺得到的细小晶粒(约800 nm),并且通过大量变形形成晶粒内和晶界附近的位错缠结以及喷射原始颗粒边界氧化皮的破碎而产生的强化。The hot working process of multi-layer spraying deposited Al-8.SFe-1.3V-1.7Si/SiCp composite was investigated. The effects of different processes on the mechanical properties of the composite were studied.The optimum process was obtained by adjusting process parameters, and the mierostmcture and phase component of the composite during variable process were observed by OM, SEM, TEM and X-ray diffraction delectation.Furthermore, the influences of the process parameters on deformability and mechanical properties of the composite were analyzed. The results show that the tensile strength of Al-8.5Fe-1.3V-1.7Si/SiCp composite sheet obtained by rolling at 490℃ after hot pressing is 620 MPa at ambient temperatnre, 300 MPa at 315℃ and 1 85 MPa at 400℃, which indicates the remarkable mechanical properties. The good combination between SiC particles and matrix, the phase Alk13（Fe,V）3Si deposited from base materials, the refine grains （about 800nm） in the base materials obtained by multi-layer spraying deposition,the dislocation tangle at grain and near grain boundary by the deformation, and the breaking of oxide skins all contribute to these remarkable ambient temperature and high temperature properties.

关 键 词：Al-8.5Fe-1-3V-1.7Si/SiC复合材料 多层喷射沉积 室温高温性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]