Research on Effects of High-pressure Torsion on Dense Consolidation and Strengthening-Toughening of Refractory Tungsten Metal Powder AITranslate

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Chinese Library Classification Number:TG146.411[金属学及工艺—金属材料]

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Pure tungsten powder was successfully directly consolidated into the dense material by high-pressure torsion at 440 ℃.The effects of HPT on dense consolidation,grain refinement and room-temperature brittleness of pure tungsten powder were investigated by metallographical microscope,micro Vickers hardness tester,scanning electronic telescope and X-ray diffractometer.The experimental results indicate that the pores among tungsten particles are effectively closed by high pressure torsion,particles are well combined and the interface has no obvious gaps.The microhardness of tungsten billet prepared by HPT is HV854～1 194,its grain size is 141～394nm,and its room-temperature microhardness indentation is neat with clear boundary and without crack defect in four corners.Compared with powder pressing and sintering process,high-pressure torsion process can more effectively eliminate particle agglomeration,reduce pore number,refine grain size and improve microstructure uniformity and room-temperature brittleness.