Microstructure and Room Temperature Tensile Properties of Rolled Mo-14%Re Alloy

Mo-Re alloys have excellent mechanical and processing properties due to their high-temperature resistance, corrosion resistance, and plasticity. To further understand the microstructure and room temperature tensile properties of rolled Mo-14%Re alloy, the microstructure and fracture morphology of the Mo-14%Re alloy were investigated by scanning electron microscopy (SEM) and high-resolution electron backscatter diffraction (EBSD). Channel 5 software was used to analyze the microstructure evolution of rolled Mo-14%Re alloy at different annealing temperatures. With the increase in annealing temperature, the Schmidt factor of the Mo matrix phase and ReO3 phase decreases gradually. The texture intensity increases rapidly, and the crystal orientation intensity of the polarography increases from 6.51 to 10.18. The initial recrystallization of the rolled Mo-14%Re alloy occurs at 1100 degrees C, at which the uniform precipitation of the earth-rich ReO3 phase in the alloy leads to uniform stress distribution during tensile process, the grains of Mo matrix phase and ReO3 phase show obvious <101> crystal orientation and <111> crystal orientation, and the grain boundaries of ReO3 phase are mainly high-angle grain boundaries, which makes the elongation after fracture reach the maximum of 33.5%. The tensile fracture has the highest number of dimples and the largest size. Besides, the formation, aggregation, growth, and crack propagation of micropores during fracture were studied.