连续增强铸造铝基复合材料的结构特征和热物理性能

Structural Characterization and Thermophysical Properties of Continuously Reinforced Cast Al-Based Matrix Composite

介绍了连续增强铸造铝基复合材料的性能及其制造过程。该工艺能获得一种在某些应用场合中性能优于可热处理的铝合金或聚合复合材料的结构材料。检验得到的热物理性能和结构特征,包括材料的各向异性以及以前Al2O3增强纤维及金属预浸料坯力学性能的测定结果都证明了该材料的高质量及其在特定的载荷模式和环境条件下工作的可能性。显微观察(光学显微镜,扫描电子显微镜)显示了微观组织的形态均匀性范围,纤维带分布的各向异性,以及金属/纤维界面的粘着特性。用计算机层析X射线照相法来显示所选取的微观组织组元的三维形态。结果表明:预浸料坯的特殊性能一方面受到其内在的微观组织几何形态,即Al2O3增强纤维体积分数和空间分布的强烈影响,另一方面还受到金属预浸料坯的各组元之间达到非常好的相容性的强烈影响。

In this work the process of manufacturing a continuously reinforced cast Al matrix composite and its properties are presented.The described technology permits obtaining a structural material of competitive properties compared to either heat treatable aluminum alloys or polymer composites for several types of applications.The examined thermophysical properties and structural characterization,including material anisotropy,coupled with the results of previous measurements of the mechanical properties of both Al2O3 reinforcing filaments and metallic prepregs have proven the high quality of this material and the possibility of its operation under special loading modes and environmental conditions.Microscopic examinations（LM,SEM）were carried out to reveal the range of morphological homogeneity of the microstructure,the anisotropy of the filament band distribution,and simultaneously the adhesive behavior of the metal/fiber interface.The 3D morphology of the chosen microstructure components was revealed by computer tomography.The obtained results indicate that special properties of the examined prepreg materials have been strongly influenced,on the one hand,by the geometry of its internal microstructure,i.e.spatial distribution and volume fraction of the Al2O3 reinforcing filaments and,on the other,by a very good compatibility obtained between the individual metal prepreg components.