Biomedical β-phase Ti-Nb-Ta-Zr alloys usually exhibit low elastic modulus with inadequate strength.In the present work,a series of newly developed dual-phase Ti-xNb-yTa-2Zr(wt.％)alloys with high per-formance were investigated in which the stability of β-phase was reduced under the guidelines of ab initio calculations and d-electronic theory.The effects of Nb and Ta contents on the microstructure,com-pressive and tensile properties were investigated.Results demonstrate that the designed Ti-xNb-yTa-2Zr alloys exhibit typical characteristics of α+β dual-phase microstructure.The microstructure of the alloys is more sensitive to Nb rather than Ta.The as-cast alloys exhibit needle-like α'martensite at a lower Nb content of 3 wt.％and lamellar α'martensite at an Nb content of 5 wt.％.Among the alloys,the Ti-3Nb-13Ta-2Zr alloy shows the highest compressive strength(2270±10 MPa)and compressive strain(74.3％±0.4％).This superior performance is due to the combination of α+,β dual-phase microstructure and stress-induced α"martensite.Besides,lattice distortion caused by Ta element also contributes to the compres-sive properties.Nb and Ta contents of the alloys strongly affect Young's modulus and tensile properties after rolling.The as-rolled Ti-3Nb-13Ta-2Zr alloy exhibits much lower modulus due to lower Nb content as well as more a"martensite and β phase with a good combination of low modulus and high strength among all the designed alloys.Atom probe tomography analysis reveals the element partitioning between the a and β phases in which Ta concentration is higher than Nb in the α'phase.Also,the concentration of Ta is lower than that of Nb in theβ phase,indicating that theβ-stability of Nb is higher than that of Ta.This work proposes modern α+f3 dual-phase Ti-xNb-yTa-2Zr alloys as a new concept to design novel biomedical Ti alloys with high performance.

Ting Zhang;Daixiu Wei;Eryi Lu;Wen Wang;Kuaishe Wang;Xiaoqing Li;Lai-Chang Zhang;Hidemi Kato;Weijie Lu;Liqiang Wang

State Key Laboratory of Metal Matrix Composites,School of Material Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China;School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China;Institute for Materials Research,Tohoku University,2-1-1 Katahira,Sendai,Miyagi,980-8577,Japan;Department of Stomatology,Renji Hospital,School of Medicine,Shanghai Jiao Tong University,Shanghai,200127,China;Department of Materials Science and Engineering,KTH-Royal Institute of Technology,10044,Stockholm,Sweden;School of Engineering,Edith Cowan University,270 Joondalup Drive,Joondalup,Perth,WA 6027,Australia

材料科学技术（英文版）

[1]Ting Zhang;Daixiu Wei;Eryi Lu;Wen Wang;Kuaishe Wang;Xiaoqing Li;Lai-Chang Zhang;Hidemi Kato;Weijie Lu;Liqiang Wang-.Microstructure evolution and deformation mechanism of α+β dual-phase Ti-xNb-yTa-2Zr alloys with high performance)[J].材料科学技术（英文版）,2022(36):68-81

yTa,13Ta,+f3

Microstructure,evolution,deformation,mechanism,dual,Ti,xNb,2Zr,alloys,performance,Biomedical,usually,elastic,modulus,inadequate,strength,In,present,work,series,newly,developed,wt,were,investigated,which,stability,was,reduced,under,guidelines,initio,calculations,electronic,theory,effects,contents,microstructure,tensile,properties,Results,demonstrate,that,designed,typical,characteristics,more,sensitive,rather,than,cast,needle,like,martensite,lower,lamellar,Among,3Nb,shows,highest,compressive,strain,This,superior,due,combination,stress,induced,Besides,lattice,distortion,caused,by,element,also,contributes,strongly,affect,Young,after,rolling,rolled,exhibits,much,well,good,among,Atom,probe,tomography,analysis,reveals,partitioning,between,phases,concentration,higher,Also,indicating,proposes,modern,concept,novel,biomedical

0.368043