Effect of Titanium Hydride Content on Near-alpha Multicomponent High Temperature Titanium Alloy
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摘要: 采用氢化钛以及钛粉作为主要原料，通过粉末冶金法制备近α型多元高温钛合金，探究不同氢化钛含量对合金微观组织及力学性能的影响。结果表明，随着氢化钛含量增加，合金中氧含量逐渐减少，致密度增加，达到95.45%；随着氢化钛含量增加，力学性能增加，抗拉强度达到460.1 MPa；随着氢化钛含量增加，硬度（HV）增加，达到298.4；随着氢化钛含量增加，组织由等轴组织转变为条状的网篮组织，条状的α相增多，样品孔隙逐渐减少，Al元素在α相中的固溶程度增加；说明采用氢化钛粉制备近α型多元高温钛合金，能显著提高合金性能。Abstract: Near-alpha multicomponent high temperature titanium alloy was prepared through powder metallurgy using titanium hydride and titanium powder as the main raw materials,and the effect of titanium hydride content on the microstructure and mechanical properties of the alloy was investigated.The results show that with the increase of titanium hydride content,oxygen content in the alloy decreases gradually,and the density of the alloy gradually increases reaching 95.45%.With the increase of titanium hydride content,both of the mechanical properties and hardness of the alloy increase,having the tensile strength and hardness reached to 460.1 MPa and 298.4 HV,respectively.With the increase of titanium hydride content,the alloy changes from equiaxed structure to strip-like basket structure,accompanying the increase of strip-like alpha phase and the solubility of Al element in alpha phase,as well as the gradual decrease of porosity in the samples.It indicates that the properties of near-alpha multicomponent high temperature titanium alloy prepared from titanium hydride powder can be significantly improved.
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