界面对颗粒增强金属基复合材料强化性能的影响

为提高颗粒增强金属基复合材料的力学性能,采用基于微观组织的胞元模型建模方法,并利用有限元软件ABAQUS着重分析了界面层厚度以及界面层强度对复合材料性能的影响,通过对复合材料中各组成部分的应力、应变云图的获取,形象地说明了各部分的变形规律.研究结果表明,在弱界面层下,随着界面层厚度的增加,复合材料的强化效果并不显著,而在强界面层下,随着界面层厚度的增加,强化效果非常明显;就界面层强度来说,界面越强,所表现出的强化效果就越明显,但当界面层强度比基体大得多时,随着界面层强度的增加,虽然复合材料的强化呈递增趋势,但是递增的幅度已逐渐降低.

Interfacial effects on the strengthening behavior of metal matrix composite reinforced with SiC particles

The interface in a metal matrix composite was modeled using finite element method to study the effect of interface on the metal matrix composite,such as interface thickness and stiffness. The finite element model was established based on the actual microstructure,including the modeling without interface,the modeling with interface and the modeling with connective interface. In the analysis,the special attention was put on the distribution of mises in matrix,interface and particles. The results show that under the soft interface, the influence of interface thickness on the mechanical behavior is not distinct,while under the strong interface,the influence of interface thickness on the mechanical behavior is obvious. The intensity of metal matrix composite increases with the increasing interface modulus,but the extent of increase is decided by the modulus matching between interface and matrix.