热挤压和旋锻粉末冶金纯钛的组织和力学性能

采用粉末冶金技术结合热挤压和旋锻工艺制备纯钛棒，利用万能试验机、维氏显微硬度仪、金相显微镜、高精度多功能密度计等设备测试纯钛棒的屈服强度、维氏硬度、显微组织和相对密度，研究了纯钛棒的制备工艺及其微观组织结构对材料力学性能的影响。研究表明，利用粉末冶金技术结合热挤压和旋锻工艺制备的纯钛棒屈服强度是880 MPa，均匀延伸率是4.06%，在拉伸变形过程中发生韧性断裂。纯钛棒显微组织为等轴状的细晶粒组织，平均晶粒尺寸约1 μm，组织分布均匀，无明显裂纹和缺陷，有较高的相对密度。

Microstructure and mechanical properties of pure titanium prepared by powder metallurgy combined with hot extrusion and rotary swagin

Pure titanium rods were prepared by the powder metallurgy technology combined with the hot extrusion and the rotary swaging. The yield strength, Vickers hardness, microstructure, and relative density of the pure titanium rods were tested by the universal testing machine, Vickers microhardness tester, metallographic microscope, and high-precision multifunctional densitometer. The effects of preparation technology and microstructure on the mechanical properties of the pure titanium rods were studied. The results show that, the yield strength of pure titanium rods prepared by the powder metallurgy combined with the hot extrusion and rotary forging is 880 MPa, the uniform elongation is 4.06%, and the ductile fracture occurs during the tensile deformation. The microstructure of pure titanium rods is equiaxed fine grain structure, the average grain size is about 1 μm, the structure distribution is uniform, showing no obvious cracks and defects and high relative density.