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通过研究元素添加方式对粉末冶金Ti-6Al-3Nb-2Zr-1Mo(Ti80)合金微观组织和力学性能的影响,探索了提高粉末冶金Ti80合金材料性能的途径和方法。结果表明:要得到相对密度大于97%的粉末冶金烧结坯,Al必须以NbAl、ZrAl、MoAl、MoAlTi等中间合金方式进行添加;Nb、Zr可以单质或中间合金方式添加;Mo需要以MoAl或MoAlTi中间合金方式添加。Ti不能完全以TiH2的方式添加;当Ti以纯Ti粉方式添加时,拉伸断口没有裂纹产生;当Ti以TiH2方式添加时,断口有显著的裂纹产生;H是裂纹产生的主要原因。当元素以合适的方式添加时,Ti80合金烧结件的性能可达到:σb=890～1020MPa,σ0.1=755～875MPa,σ0.2=785～895MPa,δ5=5.5%～9.0%,ψ=11%～20%,与锻态性能相比,强度性能有显著提高,而塑性降低。
The effects of element addition on the microstructure and mechanical properties of Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy were investigated. The ways and ways to improve the properties of Ti80 alloy powder metallurgy were explored. The results show that to get powder metallurgy sintered billet with a relative density greater than 97%, Al must be added as a master alloy such as NbAl, ZrAl, MoAl and MoAlTi; Nb and Zr can be added as simple substance or as an intermediate alloy; Intermediate alloy way to add. Ti can not be completely added by TiH2; when Ti is added by pure Ti powder, there is no crack in the tensile fracture; when Ti is added by TiH2, there are obvious cracks in the fracture; H is the main reason for the crack. When the elements are added in an appropriate way, the properties of Ti80 alloy sintered parts can be achieved: σb = 890-1020MPa, σ0.1 = 755-875MPa, σ0.2 = 785-895MPa, δ5 = 5.5-9.0%, ψ = 11% ~ 20%, compared with the forging performance, the strength and performance of a significant increase, while reducing the plasticity.