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《Rare Metal Materials and Engineering》 2012-07
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Effect of Microwave Sintering Parameters on Microstructure and Mechanical Properties of Powder Extruded Rods of Tungsten-Based Alloy

Liu Wensheng, Zhang Jiajia, Ma Yunzhu, Zhao Yaxu, Xu Zhigang, Huang Boyun (State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China)  
The effects of temperature and time of microwave sintering on the microstructure and properties of powder extruded rods of W-based alloy were studied. Fracture morphologies and microstructures were examined by SEM and optical microscope, respectively. The relative density, the tensile strength, the elongation and the hardness of samples were measured and analyzed. The results show that when microwave sintering time is 30 min, the properties of samples change as a peak shape with the increase of sintering temperature. Upon sintered at 1550 °C, relative density, the tensile strength, the elongation and the hardness of the samples reach the maximum values of 98.3%, 920 MPa, 9.7% and 30.5, respectively. When the microwave sintering temperature is 1550 °C, the mechanical properties of samples increase firstly and then decrease with the increase of sintering time. The size of tungsten grains increases gradually with increasing of microwave sintering temperature and prolonging of microwave sintering time.
【Fund】: 国家自然科学基金(50774098);; 国家基础科研基金
【CateGory Index】: TG146.411
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