Phase transformations and mechanical properties of a Ti36Nb5Zr alloy subjected to thermomechanical treatments  

作　　者：Qing-Kun Meng Jia-Dong Xu Huan Li Chong-Hang Zhao Ji-Qiu Qi Fu-Xiang Wei Yan-Wei Sui Wen Ma 

机构地区：[1]School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China [2]Department of Materials Science and Chemical Engineering,Stony Brook University,Stony Brook,NY 11794,USA [3]Grinm Group Co.,Ltd,Beijing 100088,China

出　　处：《Rare Metals》2022年第1期209-217,共9页稀有金属（英文版）

基　　金：This work was financially supported by the Fundamental Research Funds for the Central Universities(No.2017QNA04);Qing-Kun Meng thanks Prof.Yu-Chen Karen Chen-Wiegart at Stony Brook University and Dr.Jian-Ming Bai,Dr.Hui Zhong and Dr.Sanjit Ghose at National Synchrotron Light Source II for their assistance in the synchrotron experiments.This research used 28-ID-2(XPD)beamline of the National Synchrotron Light Source II,a U.S.Department of Energy(DOE)Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No.DE-SC0012704.

摘　　要：Various solid state phase transformations exist in metastable β-type Ti alloys,which can be employed to optimize the mechanical properties.In this paper,synchrotron X-ray diffraction(SXRD)experiments were carried out to study the phase transformations of a Ti36Nb5Zr alloy subjected to different thermomechanical treatments.Furthermore,the correlation between the phase constitutions and the mechanical properties was discussed.The a" texture formed,and high-density defects were introduced after cold rolling of the solution treated specimen,leading to the decrease in Young’s modulus and the increase in strength.The cold-rolled specimens were then annealed at temperatures from 423 to 773 K for 30 min.Both the Young’s modulus and strength increased with annealing temperatures increasing up to 673 K,which resulted from the precipitation of the ω and/or α phases.With further increase in annealing temperatures to 773 K,the β→α precipitation replaced the β→ω_(iso) phase transformation,and the density of defects decreased,leading to the decrease in both the Young’s modulus and strength.These results provide theoretical basis for the design biomedical Ti alloys with both low Young’s modulus and high strength.

关 键 词：β-type Ti alloys Phase transformations Mechanical properties Thermomechanical treatments Synchrotron X-ray diffraction 

分 类 号：TG146.23[一般工业技术—材料科学与工程]