【摘 要】
：
Ultrafine grain tungsten heavy alloys (WHAs) were successfully produced from the nano-crystalline powders using spark plasma sintering. The present study mainly discussed the effects of sintering temperature on the density, microstructure and mechanical p
【机 构】
：
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Institute of Mat
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
Ultrafine grain tungsten heavy alloys (WHAs) were successfully produced from the nano-crystalline powders using spark plasma sintering. The present study mainly discussed the effects of sintering temperature on the density, microstructure and mechanical properties of the alloys. The relative density of 98.12％ was obtained at 1050 ℃, and the tungsten grain size is about 871 nm. At 1000 ℃-1200 ℃, the mechanical properties of the alloys tend to first rise and then goes down. After SPS, the alloy exhibits improved hardness (84.3 HRA at 1050 ℃) and bending strength (987.16 MPa at 1100 ℃), due to the ultrafine-grained microstructure. The fracture mode after bending tests is mainly characterized as intergranular or intragranular fracture of W grains, interfacial debonding of W grains-binding phase and ductile tearing of binding phase. The EDS analysis reveals a certain proportion of solid solution between W and Ni-Fe binding phase. The good mechanical properties of the alloys can be attributed to grain refinement and solid solution strengthening.
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