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冷轧态Ti-6Al-4V(TC4)合金经两种不同热处理制度处理之后,分别得到70%的等轴α相和30%的α+β片层组织(TC4-1)与25%的等轴α相和75%的α+β片层组织(TC4-2).等轴α相的晶粒尺寸分别为7.0±2μm和9.5±1.5μm.在室温下进行高压扭转,扭转过程中施加6.0 GPa的压力,扭转速度为1 r/min,分别扭转了1/4、5、10和20圈.随着扭转圈数和片层组织的增加,组织更为均匀.经20圈扭转变形后,TC4-1和TC4-2中的晶粒尺寸分别为115±30 nm和75±15 nm.随着片层组织的增加,显微硬度值显著升高.同时探讨了相比例对晶粒细化机制的影响.
The cold-rolled Ti-6Al-4V (TC4) alloy was treated with two different heat treatment systems to obtain 70% equiaxed α phase and 30% α + β lamellar structure (TC4-1) and 25% Axis α-phase and 75% α + β lamellae (TC4-2). The grain size of the equiaxed α-phase is 7.0 ± 2 μm and 9.5 ± 1.5 μm, respectively.High-pressure torsion is carried out at room temperature and 6.0 GPa pressure, the reverse speed of 1 r / min, respectively, 1/4, 5, 10 and 20. With the number of turns and the lamellar organization, the organization is more uniform after 20 laps twist deformation, The crystal sizes of TC4-1 and TC4-2 were 115 ± 30 nm and 75 ± 15 nm, respectively.With the increase of the lamellar structure, the microhardness value increased significantly.At the same time, Mechanism of influence.