钨及钨合金因熔点高、蒸气压低、热传导率高、耐蚀性及热冲击性良好而使其在高温环境下广泛应用。但形状复杂的零部件加工(如车削等)较困难。大的塑性变形不仅可使材料的拉伸强度升高、硬度增大,而且还可使其韧性提高。高压扭转是一种常用的获得细晶的大塑性变形法。高压扭转时 Tungsten and tungsten alloys are widely used under high temperature due to their high melting point, low vapor pressure, high thermal conductivity, good corrosion resistance and thermal shock resistance. However, the complex shape of parts processing (such as turning, etc.) more difficult. Large plastic deformation not only makes the tensile strength of the material increases, the hardness increases, but also make it toughness increased. High-pressure torsion is a commonly used method of obtaining large crystals of fine crystals. When high pressure is reversed