科研之友
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摘要
Tungsten-rhenium (W-10Re) powder was successfully prepared by wet chemistry method followed by spark plasma sintering technique to fabricate W-10Re alloy. The synthesis mechanism and reduction behavior of the W10Re powders were investigated by using X-ray diffraction (XRD), thermogravimetric experiments, and X-ray photoelectron spectroscopy. The reduction process of W-10Re powders from 100 degrees C to 1200 degrees C was divided into four stages, and the optimal reduction temperature region is 1000-1100 degrees C. The reduced powders with irregular cube-shape were examined by transmission electron microscope. The XRD results of powders reduced at 1000-1200 degrees C showed an overall right shift with the increase in temperature, indicating the solid solution of Re into W. The microstructure and mechanical properties of the alloys were studied using XRD, transmission electron microscopy, scanning electron microscopy, and Vickers hardness. The relative densities and grain sizes were comparable for the W-10Re alloys prepared from the powders reduced at 1000 degrees C, 1100 degrees C, and 1200 degrees C, whereas the Vickers hardness was decreased with the increase in the reduction temperature for those samples. The characterization of fracture toughness for these W-10Re alloys showed largely intergranular fracture with a small number of transgranular features.
