Synchrotron X-ray diffraction characterization of phase transformations during thermomechanical processing of a Ti38Nb alloy

查看全文 作　　者：Qing-Kun [1]Meng;Huan [1]Li;Chong-Hang [2]Zhao;Wen [3]Ma;Fu-Xiang [1]Wei;Yan-Wei [1]Sui;Ji-Qiu [1]Qi

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》索引2021年第40卷第11期,共10页

基　　金：financially supported by the Fundamental Research Funds for the Central Universities (No.2017QNA04)。 摘　　要：The phase transformations during thermomechanical processing can be employed to optimize mechanical properties of β-type Ti alloys.However,such understandings are still lacking for the alloy consisting of dual β+α' phases in solution-treated and quenched state.In this paper,the phase transformations in a Ti38 Nb model alloy subjected to different thermomechanical processing were investigated by using synchrotron X-ray diffraction(SXRD) experiments,and their influence on the Young’s modulus was discussed.The results indicated that highdensity dislocations introduced by cold rolling still existed after annealing at temperatures lower than 573 K,which can decrease the martensitic transformation start temperature to below room temperature.With annealing temperatures increasing,the α'→β,β→ω_(iso),and β→α phase transformations occurred successively.At annealing temperature of 473 K,the specimen consisted of a trace of α'and ω phases as well as dominant β phase which was kept to room temperature by the high density of dislocations,rather than by the chemical stabilization.As a result,an ultralow Young’s modulus of 25.9 GPa was realized.Our investigation not only provides in-depth understandings of the phase transformations during thermomechanical processing of β-type Ti alloys,but also sheds light on designing biomedical Ti alloys with ultralow Young’s modulus. 关键词：Ti alloys Phase transformation Thermomechanical processing Synchrotron X-ray diffraction

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Synchrotron X-ray diffraction characterization of phase transformations during thermomechanical processing of a Ti38Nb alloy

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