本发明公开了一种高致密高强韧超细晶金属纯钼的制备方法，该方法中采用反复径向-轴向锻压的方法对纯钼进行大塑性变形，施加总变形量达到300%以上，反复的多向锻造具有强烈的晶粒细化能力，使得钼材的各项力学性能得到改善;因而本发明制备的纯钼晶粒细小，平均晶粒度在1~5um，显微组织均匀:相对致密度高，平均致密度>99.9%;力学性能优异，温抗拉强度≥680MPa，延伸率>51%。本发明的方法中多向锻造后采用接近再结晶温度退火，改善了加工组织和力学性能的各向异性。本发明采用的多向锻造工艺简单、成本低、易于实现工业化生产。

The invention discloses a method for preparing high-density, high-strength, and ultra-fine-crystalline metal pure molybdenum. In the method, the method of repeated radial-axial forging is adopted to carry out large plastic deformation of the pure molybdenum, and the total applied deformation reaches more than 300%. Repeated multi-directional forging has a strong grain refinement ability, which improves the mechanical properties of molybdenum materials; therefore, the pure molybdenum prepared by the invention has fine grains, with an average grain size of 1~5um, and a uniform microstructure: Relatively high density, average density>99.9%; excellent mechanical properties, warm tensile strength ≥680MPa, elongation>51%. The method of the present invention adopts annealing close to the recrystallization temperature after multi-directional forging, which improves the anisotropy of the processing structure and mechanical properties. The multi-directional forging process adopted by the invention is simple, low in cost, and easy to realize industrialized production.