Microstructure, mechanical and thermo-physical properties of hot-rolled Mo-50Cu composite

Abstract

Mo-50Cu composite plates were prepared by ball milling, hot isostatic pressing, and hot rolling. The microstructure and properties of Mo-50Cu composites with different rolling reductions were studied. When the rolling reduction is lower than 38%, the plastic deformation of the composite mainly occurs in the Cu phase. With the increase of rolling reduction, the texture of the Cu phase changes from Goss texture to Brass and S texture, and the plastic deformation of the Cu phase and Mo phase occurs simultaneously. During hot rolling deformation, the elongation of the composite decreases with the increase of the deformation degree. When the rolling reduction is 56%, the yield strength and tensile strength of the composite reach the maximum values of 522.3 MPa and 588.8 MPa, respectively. The composite with 56% rolling reduction also has the lowest coefficient of thermal expansion of 9.81 × 10−6·K−1. In addition, the composite has the highest thermal conductivity of 262.1 W·m−1·K−1 after hot 38% hot rolling reduction and 950 ℃ annealing. The effects of rolling reduction on the density, grain size, residual stress, dislocation density, Mo morphology, and the properties of the composite were analyzed.