Process Optimization And Numerical Simulation Of Elastic Modulus For SiCp/6066Al Matrix Composites

SiC particulate reinforced aluminium matrix composite possesses excellent mechanical properties and physical properties such as high specific strength and specific rigidity, wearproof, antifatigue, low thermal coefficient of expansion, low density, high micro-yield strength, favorable dimensional stability and thermal conduction. It can be extensively used into those regions such as aerospace, military affairs, automobile, electron and athletic sports. Currently, many nations of the world successively enter application and development stage of silicon carbide reinforecd aluminium matrix composite. In USA and European developed countries, this composite's industrial application has already initiated, and has been labeled as important trend of 21 century's new material application and development. In China, there exists many organizations researching silicon carbide reinforeced aluminium matrix composite, and some development has been acquired. One of the substantial clauses that restrict extensive use of this composite is that its elastic modulus are unable to conform applied requirement. Therefore, developing silicon carbide particulate reinforced aluminium matrix composite of high specific elastic modulus to satisfy the requirement is of important application value.The primary object investigated in this dissertation is to improve elastic modulus of SiC_p/6066Al composite under the precondition of guaranteeing tensile properties(specific elongation in particular). So the dissertation takes composite micromechanics as theory tool, via composite fabrication, tensile properties and elastic modulus testing, structure observation(such as metallographic structure, tensile fracture, interface pattern) , and utilizing macro - micro unified constitutive model to numerically simulate elastic modulus of the composite, ultimately reveal determinative influencing factors in elastic modulus of the composite.In this investigation, SiC_p/6066Al aluminium matrix composite of high elastic modulus was successfully fabricated by canning and hot extrusion powder metallurgy process. Those were found in the investigation: in order to get SiC_p/6066Al composite with expecting properties, the feasible volume fraction of SiC particulate is 12%. 520℃/20min+water quenching+170℃/5h is the relatively excellent heat treatment system, which does good to ultimate tensile strength, yield strength and specific elongation of the composite. The uniformity of particulates distribution in various metallographic...