High strength,low modulus,and ductile metastable beta Ti-Nb-Zr-Fe alloys by laser powder bed fusion in-situ alloying
简介：A novel,high strength,low modulus,and ductile metastable β Ti-14Nb-6Zr-3Fe(TNZF)alloy was manu-factured via laser powder bed fusion(LPBF)in-situ alloying.Process parameter optimization resulted in near-fully dense samples(＜0.1％porosity)under optimal conditions.The microstructure and mechani-cal properties of TNZF alloy were then tailored using two chessboard scanning strategies and a simple scanning strategy.Samples fabricated using the chessboard scanning strategy(CS-TNZF)benefited from a lower thermal gradient,the high growth restriction factor associated with the addition of Fe,and con-stitutional supercooling around residual Nb particles,resulting in a near-equiaxed grain structure(av-erage aspect ratio:2.0)compared to the AS-TNZF(fabricated using the simple scanning strategy).The microstructure consisted of a β-Ti matrix with 2-5 nm sized w precipitates.Due to the addition of Zr,the transition from β to ω was suppressed during thermal cycling associated with LPBF,resulting in the presence of a partially collapsed ω phase.Without post-processing heat treatments,the AS-TNZF condi-tion exhibited a yield strength(YS)of 1091 MPa,an elastic modulus(E)of 68 GPa,and an elongation(EL)of 16.8％,while the CS-TNZF counterpart achieved a higher YS of 1147 MPa and E of 71 GPa,but a lower EL of 10.8％due to a higher volume fraction of ω phase.Both AS-TNZF and CS-TNZF demonstrated high elastic admissible strain values(YS/E ratio)of 1.60 and 1.62,respectively,achieving high strength,low modulus,and good ductility,which indicates their suitability for biomedical implant materials.展开
学者：YueLILiuyongWangHaoyueWuFengDingMinLEIJinYangJ.P.OliveiraMingYanWeiGUOYulong
关键词：laser powder bed fusionhigh strengthlow modulusMetastable β titanium alloyin-situ alloying
在线出版日期：2026-01-27 （网站首发日期）
