烧结压力对生物医用Ti-Nb-Zr-Mn合金显微组织与力学性能的影响

Effect of Sintering Pressure on Microstructure and Mechanical Properties of Biomedical Ti-Nb-Zr-Mn Alloys

以单质金属粉末为原料,采用机械合金化(MA)和放电等离子烧结(SPS)法制备了力学性能优异的生物医用Ti24Nb4Zr3Mn合金,研究了烧结压力对Ti24Nb4Zr3Mn合金显微组织和力学性能的影响。结果表明,不同烧结压力下获得的Ti24Nb4Zr3Mn合金均为体心立方β相和斜方马氏体α"相双相合金。随着烧结压力的增加,α"相在烧结合金中分布更加均匀,合金的硬度和相对密度不断增加,极限抗压强度和塑性有明显的提高。在50 MPa烧结压下的合金拥有最优的力学性能,其硬度、极限抗压强度和断裂时塑性应变分别高达424 HV、2763 MPa和51.6%。

Using elemental metal powders as raw materials, mechanical alloying(MA) and spark plasma sintering(SPS) were used to prepare biomedical Ti24 Nb4 Zr3 Mn alloy with excellent mechanical properties. The effect of sintering pressure on the microstructure and mechanical properties of Ti24 Nb4 Zr3 Mn alloy was studied. The results show that the Ti24 Nb4 Zr3 Mn alloys obtained under different sintering pressures are all dual-phase alloys of body-centered cubic β phase and orthorhombic martensite α " phase. With the increase of sintering pressure, the α" phase is more evenly distributed in the sintered alloys. The hardness and relative density of the alloys are continuously increasing, and the ultimate compressive strength and plasticity are significantly improved. The alloy under 50 MPa sintering pressure has the best mechanical properties, and its hardness, ultimate compressive strength and plastic strain at fracture are as high as 424 HV, 2763 MPa and 51.6 %, respectively.