| 李明,刘腾飞,徐焕淋,赵柯帆,孔涵芊,李强.时效处理对Ti-12Nb-2Fe-8Zr合金显微组织和力学性能的影响[J].有色金属材料与工程,2025,46(2):70-75. |
| 时效处理对Ti-12Nb-2Fe-8Zr合金显微组织和力学性能的影响 |
| Effect of aging treatment on microstructures and mechanical properties of Ti-12Nb-2Fe-8Zr alloys |
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| DOI：10.13258/j.cnki.nmme.20240301001 |
| 中文关键词: β型钛合金 时效处理 显微组织 力学性能 耐腐蚀性能 |
| 英文关键词:β-type titanium alloy aging treatment microstructure mechanical properties corrosion resistance |
| 基金项目:上海高性能医疗器械材料工程技术研究中心资助项目（20DZ2255500） |
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| 中文摘要: |
| 采用电弧熔炼法制备了Ti-12Nb-2Fe-8Zr合金铸锭，随后进行冷轧、固溶和时效处理。使用 X 射线衍射仪与光学显微镜分析合金相组成及微观组织，利用万能材料试验机和维氏硬度计测试其力学性能与维氏硬度，借助电化学工作站开展合金耐蚀性测试。结果表明，固溶态合金由单一β相组成，随着时效温度的升高，合金的相组成分别为β相、（β+ω）相和（α+β）相。时效态合金的维氏硬度均高于固溶态合金；300 ℃时效后合金中ω相数量最多，维氏硬度最大，随后维氏硬度随着时效温度的上升而减小。固溶态合金的弹性模量较低、伸长率较大；300、400 ℃时效后合金发生脆断，450 ℃时效后，合金的抗拉强度达到831 MPa，伸长率为14%；600 ℃时效后，合金的抗拉强度为703 MPa，伸长率约为27%。除400 ℃时效外，其余状态下的合金均具有较宽且稳定的钝化区间，显示出良好的耐蚀性。 |
| 英文摘要: |
| Ti-12Nb-2Fe-8Zr alloy ingots were prepared by arc melting following by cold rolling, solution treatment, and aging treatment. The phase compositions and microstructures of the alloy were analyzed by X-ray diffractometer and optical microscope, the mechanical properties and Vickers hardness of the alloy were tested using tensile testing and Vickers hardness tester, and the corrosion resistance of the alloy was evaluated using an electrochemical workstation. The results indicate that the solution-treated alloy is composed of a single β phase. With the increase of aging temperature, the phase compositions of the alloy are β, β+ω, and α+β, respectively. The Vickers hardness of the aged alloy is higher than that of the solution-treated one, and the alloy after aging at 300 ℃ has the highest numbers of ω phase and shows the highest Vickers hardness. And then the Vickers hardness decreases with the increase of aging temperature. The elastic modulus of the solution-treated alloy is low and the elongation is high. After aging at 300 and 400 ℃, the alloy shows brittle fracture. After aging at 450 ℃, the tensile strength of the alloy reaches 831 MPa with an elongation after fracture of 14%. After aging at 600 ℃, the tensile strength of the alloy is 703 MPa, and the elongation after fracture is approximately 27%. Except for 400 ℃ aging, alloys under other states all have a wide and stable passivation range, suggesting a good corrosion resistance. |
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