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刘畅,董月成,方志刚,王莹,郭艳华,常辉,周廉.新型高强韧Ti-Al-Fe-B系钛合金组织和性能研究[J].稀有金属材料与工程(英文),2020,49(5):1607~1613.[Liu Chang,Dong Yuecheng,Fang Zhigang,Wang Ying,Guo Yanhua,Chang Hui and Zhou Lian.Study on Microstructure Evolution and Mechanical Properties of New Ti-Al-Fe-B Titanium Alloy with High Strength and Ductility[J].Rare Metal Materials and Engineering,2020,49(5):1607~1613.]
Study on Microstructure Evolution and Mechanical Properties of New Ti-Al-Fe-B Titanium Alloy with High Strength and Ductility
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Received:January 25, 2019  Revised:April 01, 2019
DOI:
Key words: Titanium alloy  heat treatment  microstructure  mechanical properties
Foundation item:海洋装备用金属材料及其应用国家重点实验室开放基金资助(项目号SKLMEA-K201807),中国博士后科学基金资助(项目号2017M623392),江苏省研究生科研与实践创新计划项目(SJCX17_0292),江苏高校优势学科建设工程资助项目(PAPD)
Author NameAffiliation
Liu Chang,Dong Yuecheng,Fang Zhigang,Wang Ying,Guo Yanhua,Chang Hui and Zhou Lian  
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Abstract:
      In the present study, Effect of Al element addition (1~3wt.%) and heat treatment on microstructure evolution and mechanical property of one new alloy Ti-xAl-3.5Fe-0.1B was studied. Results indicated that Ti-xAl-3.5Fe-0.1B is α+β two-phase titanium alloy. Yield strength of the alloy increased from 590MPa to 900MPa and tensile strength increased from 808MPa to 1074 MPa with the variation of Al element from 1% to 3% due to solid solution strengthening effect, at the same time, the elongation to failure reduced to 15.4%. Microstructure observation revealed that the thickness of the lamellar primary α phase reduced and the grain size remarkably refined as the increasing Al element content. Meanwhile, It was found that yield strength continuously increased to 1000 MPa, tensile strength increased to 1144 MPa and the elongation to failure increased to 17.5% separately after double annealing, which indicated unique mechanical property. The metastable β phase formed in the microstructure decomposed to secondary α phase with fine grain size during the double annealing in the alloy, which blocked the movement of dislocation and induced enhancement of strength, at the same time, the dispersion of secondary α phase on β substrate was also beneficial to the strength. On the other hand, the present of equiaxed α phase was considered favorable to the improvement of elongation to failure.