title: Precipitation hardening and microstructure evolution of the Ti-7Nb-10Mo alloy during aging.
abstract: A biomedical β titanium alloy (Ti-7Nb-10Mo) was designed and prepared by vacuum arc self-consumable melting. The ingot was forged and rolled to plates, followed by quenching and aging. Age-hardening behavior, microstructure evolution and its influence on mechanical properties of the alloy during aging were investigated, using X-ray diffraction, transmission electron microscopy, tensile and hardness measurements. The electrochemical behavior of the alloy was investigated in Ringer's solution. The microstructure of solution-treated (ST) alloy consists of the supersaturated solid solution β phase and the ωath formed during athermal process. The ST alloy exhibits Young's modulus of 80 GPa, tensile strength of 774 MPa and elongation of 20%. The precipitation sequences during isothermal aging at different temperatures were determined as β+ωath→β+ωiso (144 h) at Taging=350-400 °C, β+ωath→β+ωiso+α→β+α at Taging=500°C, and β+ωath→β+α at Taging=600-650 °C, where ωiso forms during isothermal process. The mechanical properties of the alloy can be tailored easily through controlling the phase transition during aging. Comparing with the conventional Ti-6Al-4V alloy, the Ti-7Nb-10Mo alloy is more resistant to corrosion in Ringer's solution. Results show that the Ti-7Nb-10Mo alloy is promising for biomedical applications.
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China.
authors.forename: Ruowei
authors.initials: R
authors.lastname: Yi
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China; Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China. Electronic address: liuhuiqun@csu.edu.cn.
authors.forename: Huiqun
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China; Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China. Electronic address: danqing@csu.edu.cn.
authors.forename: Danqing
authors.initials: D
authors.lastname: Yi
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Wan
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China; Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: BAOTI Group Ltd, Baoji, Shanxi 721014, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.affiliation: BAOTI Group Ltd, Baoji, Shanxi 721014, PR China.
authors.forename: Dingchun
authors.initials: D
authors.lastname: Wang
authors.affiliation: BAOTI Group Ltd, Baoji, Shanxi 721014, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Gao
authors.affiliation: School of Mechanical Engineering, Xiangtan University, Xiangtan, Hunan 411105, PR China.
authors.forename: Yanfei
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Nuclear Power Institute of China, Chengdu, Sichuan 610213, PR China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Tang
mesh_terms: D055119:Elastic Modulus; D055664:Electrochemical Techniques; D006244:Hardness; D046529:Microscopy, Electron, Transmission; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: C023988:beta titanium; D014025:Titanium
keywords: Aging; Mechanical properties; Microstructure evolution; Precipitation; Ti–Nb–Mo alloy