Synthesis And Characterization Of Mo/Cu Laminar Metal Matrix Composites By Irradiation Damage Alloying Method

Mo-Cu composite materials can be widely used in aerospace field，electronicsindustry and nuclear reactor due to their excellent properties including high thermalconductivity, low coefficient of thermal expansion, high temp-resistance. Such as，radar，heat sink material, ceramic sealing material, high current-carrying contacts andthe diverter for fusion reactors.The Mo-Cu system is not mutually solid solution system despite goodapplication prospect. Mo and Cu atoms are immiscible even in liquid states and nointermediate phase exists according to the equilibrium phase diagram. Besides, bothmetals have extremely different melting points so it is very difficult to combine them.This study prepared Mo/Cu laminar metal matrix composites by irradiationdamage alloying method in response to these difficulties. The main processes aremainly as follows: First, ion implantation could lead to non-thermal equilibrium statusand radiation damage which occurred after high energy ion beam irradiation of thesurface of matrix metals. The radiation damage includs off-site atom, lattice distortion,vacancies and dislocations, etc. Then, use non-cyanide plating method to cover Cumetal layer on the surface of Mo. Finally, take high-temperature annealing under theprotection of atmosphere. Radiation damage includs off-site atom, lattice distortion,vacancies and dislocations can provide a driving force and channel for the Cu surfaceatoms in the annealing process. So that Cu surface atoms can diffusion into Mo matrixmetal. A diffusion layer is formed between surface layer and matrix layer. Alsoforms the metallurgy combination between the two metals. So that Mo/Cu laminarmetal matrix composites can have a good interfacial adhesive strength.The transmission electron microscope (TEM) has been used to study theinterfacial microstructure and performance of composite material. TEM resultsshowed that, Mo, Cu atom diffusion occurs and the forms a diffusion layer,semi-coherent interface forms at the interface. This is the main reasons why Mo/Culaminar metal matrix composites can have a good interfacial adhesive strengthAccording to TEM results, this paper established the interface model of Mo/Culaminar metal matrix composites.The plastic deformation characteristics disappeared during tensile test of Cumetal of Mo/Cu laminar metal matrix composites prepared by" immiscible metal system irradiation damage alloying ". This study explains the former problem throughtested the texture before and after the tensile test by using XRD transmission methodand TEM results.The study also designed a method to test of laminar metal matrix composites..And this method has been used to test interfacial adhesive strength of Mo/Culaminar metal matrix composites. The maximum adhesive strength between the metalin the surface and the matrix metal reaches220.2MPa, and the average is211.9MPa.The adhesive strength is higher than Mo/Cu laminar metal matrix composites with Nimetal intermediate layer reported.