高强度和低弹性模量Ti−Nb−Fe−Zr合金的显微组织和力学性能

• 作 者: 李强 黄奇 李俊杰 何黔峰 Masaaki NAKAI 张柯 Mitsuo NIINOMI Kenta YAMANAKA Akihiko CHIBA Takayoshi NAKANO
• 机 构: 上海理工大学 机械工程学院,上海 200093;中国科学院 新疆理化技术研究所 特殊环境功能材料与器件重点实验室,乌鲁木齐 830011;Division of Mechanical Engineer
• 出 处: 中国有色金属学报（英文版）
• 发表日期: 2022年2期
• 关键词: biomedical Ti alloy mechanical properties solid-solution strengthening work hard

将Zr添加到Ti?Nb?Fe合金中开发生物医用低模量、高强度β钛合金.采用电弧熔炼法制备Ti?12Nb?2Fe?(2,4,6,8,10)Zr(摩尔分数,％)铸锭,随后对其进行均匀化、冷轧和固溶处理.通过光学显微镜、X射线衍射和透射电子显微镜等技术分析合金的物相和显微组织.采用拉伸试验测定力学性能.结果表明,Zr和Fe在合金中具有显著的固溶强化效果,因此,所有合金的屈服强度和抗拉强度分别高于510 MPa和730 MPa.Zr对变形机制的影响较小,孪晶出现在所有变形合金中,且对强度和塑性有益.具有亚稳 β 相的Ti?12Nb?2Fe?(8,10)Zr合金表现出低弹性模量、高抗拉强度和良好的塑性,是生物医学植入物的合适候选材料.“,”Zr was added to Ti?Nb?Fe alloys to develop low elastic modulus and high strength β-Ti alloys for biomedical applications. Ingots of Ti?12Nb?2Fe?(2, 4, 6, 8, 10)Zr (at.％) were prepared by arc melting and then subjected to homogenization, cold rolling, and solution treatments. The phases and microstructures of the alloys were analyzed by optical microscopy, X-ray diffraction, and transmission electron microscopy. The mechanical properties were measured by tensile tests. The results indicate that Zr and Fe cause a remarkable solid-solution strengthening effect on the alloys; thus, all the alloys show yield and ultimate tensile strengths higher than 510 MPa and 730 MPa, respectively. Zr plays a weak role in the deformation mechanism. Further, twinning occurs in all the deformed alloys and is beneficial to both strength and plasticity. Ti?12Nb?2Fe?(8, 10)Zr alloys with metastable β phases show low elastic modulus, high tensile strength, and good plasticity and are suitable candidate materials for biomedical implants.