Research On Prepartion Of Laminar Metal Matrix Composites Based On Immiscible Alloy Systems With Irradiation Damage Alloying Mechanism

Many metals are immiscible, such as W-Ag、Mo-Ag、Mo-Cu etc, the compositeof which will have excellent characteristics of both metal, and can be very goodapplication in special field, but the heat of formation is positive, for example thewhich of W-Ag is+65KJ/mol, Mo-Ag is+56KJ/mol and Mo-Ag is+28KJ/mol, it isdifficult to diffuse and prepare laminar composites. Therefore, this study used thepreliminary work proposed “irradiation damage alloying mechanism” for preparingW-Ag, Mo-Ag, Mo-Cu three system of laminar metal matrix composites, and byscanning electron microscope (SEM), Auger electron spectroscopy (AES),transmission electron microscope (TEM) and mechanical tests to study the interfacialmicrostructure and performance of composite material.The results are as follows:(1) Identified the W/Ag laminar metal matrix composites preparing process, andthe welding (interface) tensile strength of composites reaches to107MPa. TEManalysis results show that the diffusion layer is consist of both Ag nanocrystalline andW/Ag amorphous. Which proved that forming amorphous alloy phase is the key toform metallurgical bond of W/Ag interface.(2) TEM results show that the diffusion layer of Mo-Ag laminar metal matrixcomposite is consist of both Ag nanocrystalline and Mo/Ag amorphous alloy phase.Meanwhile, TEM results show that the Ag of diffusion layer near surface exist a largenumber of annealing twins, the twins plane is111, which is the result of cold-rolledMo metal constraints.(3) Identified the Mo/Cu laminar metal matrix composites preparing process, andthe welding (interface) tensile strength of composites reaches to87MPa. There is nodelamination between Mo and Cu when tensile break, illustrate interfacial bondingclose.