显微组织及室温力学性能
(湖南大学 材料科学与工程学院, 长沙 410082)
摘 要: 研究了多层喷射沉积SiCP/Al-8.5Fe-1.3V-1.7Si复合材料通过挤压后再轧制以及模压致密后再轧制的显微组织特点及其室温力学性能。通过金相显微镜、X射线衍射仪、扫描电镜和透射电镜观察在加工过程中复合材料的显微组织，分析显微组织密度对室温力学性能的影响。结果表明：通过挤压后再轧制以及模压后再轧制的SiCp/Al-8.5Fe-1.3V-1.7Si复合材料具有突出的室温性能，其中通过挤压后轧制板材的室温抗拉强度(σb)达555 MPa，模压后轧制得到的板材室温抗拉强度(σb)达620 MPa；分析认为其突出的室温性能主要得益于复合材料中的颗粒状SiC的颗粒增强以及材料中弥散析出的Al13(Fe, V)3Si相、喷射沉积工艺得到基体材料的细小晶粒(约800 nm)、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。
关键字: Al-8.5Fe-1.3V-1.7Si/SiC复合材料；多层喷射沉积；室温力学性能；显微组织
properties of SiCp/Al-8.5Fe-1.3V-1.7Si composite
（College of Materials Science and Engineering, Hunan University,
Changsha 410082, China）
Abstract:The microstructure and mechanical properties at ambient temperature of multi-layer spraying deposited SiCp/Al-8.5Fe-1.3V-1.7Si composite obtained by rolling after extruding or hot pressing were investigated. The microstructure and phase components of these composites during processing were observed by SEM, TEM and XRD, furthermore, the influence of density of microstructure to OM ambient temperature mechanical properties was analyzed. The results indicate that the tensile strength (σb) of SiCp/Al-8.5Fe-1.3V-1.7Si composite sheet obtained by rolling after extruding and extruding after hot pressing are 555 and 620 MPa, respectively. The reinforcement function of SiC particles, the phase Al13(Fe, V)3 Si deposited from refine grains (about 800 nm) in the matrix alloy obtained by multi-layer spraying deposition, the dislocation tangle at grain and the near area of grain boundary gained by deformation of oxide skins contribute to these remarkable ambient temperature properties.
Key words: SiCp/Al-8.5Fe-1.3V-1.7Si composite; multi-layer deposition; ambient temperature mechanical properties; microstructure
