Microstructural and properties of W5Re/TZM composites subjected to high-temperature rolling
In this paper,W5Re/TZM composites were prepared by sintering,and the interface bonding was further improved by high temperature rolling.The effects of rolling reductions on the microstructure and mechanical properties of alloys were investigated by scanning electron microscope(SEM),energy dispersive spectrometer (EDS),electron back scatter diffraction(EBSD),transmission electron microscope(TEM) and mechanical experiments.The interface co-deformation mechanism of the composite materials was also analyzed.The results show that increasing the rolling reductions significantly refines the grains of W5Re and TZM.The smallest average grain sizes are 13.5 μm for W5Re alloy and 15.0 μm for TZM alloy.During high-temperature rolling,the W5Re alloy undergoes dynamic recovery,while the TZM alloys experience dynamic recrystallization.The Vickers microhardness of both follow the Hall-Petch relationship with average grain size.At rolling reduction of 40％,the interface shear strength of the W5Re/TZM composites reaches its highest value of 183 MPa (compared with the sintered sample increased by 60％).There is a significant accumulation of dislocations at the grain boundaries within the interfacial diffusion area.The accumulation of dislocations plays an important role in enhancing interfacial strength,while the coordinated deformation of the interface is mainly achieved through dislocation slip.
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