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Comparison of microstructure and mechanical behavior of Ti-35Nb manufactured by laser powder bed fusion from elemental powder mixture and prealloyed powder

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Journal of Materials Science & Technology 2022年第10期105卷 1-16页

作者： J.C.Wang Y.J.Liu S.X.Liang Y.S.Zhang L.Q.Wang T.B.Sercombe L.C.Zhang School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia School of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009Australia Northwest Institute for Nonferrous Metal Research Xi’an 710016China State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Although different types of powder feedstock are used for additive manufacturing via laser powder bed fusion(L-PBF),limited work has attempted to directly compare the microstructure and mechanical behavior of components manufactured from those powder *** work investigated the microstructure,phase composition,melt pool morphology,and mechanical properties of a prealloyed Ti-35Nb alloy manufactured using L-PBF and compared these to their counterparts produced from elemental powder *** samples manufactured from the powder mixture are composed of randomly distributed undissolved Nb in theα/βmatrix,resulting from the unstable melt pool during the melting of the powder *** contrast,parts produced from prealloyed powder display a homogeneous microstructure withβandαphases,owing to the full melting of prealloyed powder,therefore,a more stable melt pool to achieve a homogeneous *** Ti-35Nb manufactured from prealloyed powder exhibits large tensile ductility(about 10 times that of the counterparts using mixed powder),attributed to the high homogeneity in microstructure and chemical composition,strong interface bonding,relatively low oxygen content,and the existence of a large amount ofβ*** work sheds insights into understanding the effect of powder feedstock on the melt pool stability therefore the microstructure and mechanical behavior of the resultant parts.

关键词： titanium-niobium Powder bed fusion Additive manufacturing Melt pool stability Microstructure Mechanical properties

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Microstructural homogeneity and mechanical behavior of a selective laser melted Ti-35Nb alloy produced from an elemental powder mixture

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Journal of Materials Science & Technology 2021年第2期61卷 221-233页

作者： Jincheng Wang Yujing Liu Chirag Dhirajlal Rabadia Shun-Xing Liang Timothy Barry Sercombe Lai-Chang Zhang School of Engineering Edith Cowan University270Joondalup DriveJoondalupPerthWA 6027Australia School of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009Australia

Although using elemental powder mixtures may provide broad alloy selection at low cost for selective laser melting(SLM), there is still a concern on the resultant microstructural and chemical homogeneity of the produced parts. Hence, this work investigates the microstructure and mechanical properties of a SLM-produced Ti-35 Nb composite(in wt%) using elemental powder. The microstructural characteristics including ? phase, undissolved Nb particles and chemical homogeneity were detailed *** revealed the presence of relatively soft undissolved Nb particles and weak interface bonding around Nb-rich regions in as-SLMed samples. Solid-solution treatment can not only improve chemical homogeneity but also enhance bonding through grain boundary strengthening, resulting in43 % increase in tensile elongation for the heat-treated Ti-35 Nb compared to the as-SLMed counterpart. The analyses of tensile fractures and shear bands further confirmed the correlation between the different phases and the ductility of Ti-35 Nb. In particular, the weak bonding between undissolved Nb and the matrix in the as-SLMed sample reduces its ductility while the ? grains in solid-solution treated Ti-Nb alloy can induce a relatively stable plastic flow therefore better ductility. This work sheds insight into the understanding of homogenization of microstructure and phases of SLM-produced alloys from an elemental powder mixture.

关键词： titanium-niobium Selective laser melting Microstructure Nanoindentation Mechanical behavior

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Mechanical and biological properties of Ti–(0–25 wt%)Nb alloys for biomedical implants application

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Regenerative Biomaterials 2020年第1期7卷 119-127页

作者： Yuqing Zhang Danni Sun Jun Cheng James Kit Hon Tsoi Jiang Chen School and Hospital of Stomatology Fujian Medical UniversityFuzhou 350002FujianChina Stomatological Key Laboratory of Fujian College and University Fujian Medical UniversityFuzhou 350002FujianChina Faculty of Dentistry Dental Materials ScienceDivision of Applied Oral Sciences and Community Dental CareThe University of Hong KongHong Kong SARChina Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016ShaanxiChina

Binary titanium–niobium(Ti–Nb)alloys have recently been attracted due to low Young’s moduli and non-toxic *** study explores the influence of low Nb content(0–25 wt%)on the comprehensive parameters of tensile stress–strain relationships(ultimate strength(rUTS),yield strength(r0.2)and elastic modulus(E)),surfaces properties(Vickers microhardness,surface roughness(Ra),water contact angle(WCA),X-ray diffraction(XRD)and scanning electron microscopy(SEM)),corrosion resistance(in artificial saliva and lactic acid)and biological properties(cytotoxicity and alkaline phosphatase activity of MC3T3-E1 pre-osteoblasts)of Ti–xNb alloys(x紏5,10,15,20 and 25 wt%),with using commercially pure grade 2 titanium(cp-Ti)as *** results shown that all the Ti–xNb alloys comprised atb Ti alloy phases,such that the b phase increased correspondingly with the increased amount of Nb in the alloy,as well as the reduction of E(69–87 GPa).Except Ti–5Nb,all other Ti–xNb alloys showed a significantly higher hardness,increased rUTS and r0.2,and decreased WCA compared with *** corrosion was detected on Ti–xNb alloys and cp-Ti in artificial saliva and lactic acid *** cytotoxicity of Ti–xNb alloys was comparable to that of cp-Ti in MC3T3-E1 pre-osteoblasts without interference from differentiation behaviour,but the proliferation rate of the Ti–5Nb alloy was lower than other *** overall,binary Ti–(10–25 wt%)Nb alloys are promising candidate for orthopaedic and dental implants due to their improved mechanical properties and comparable biological performance,while Ti–5Nb should be used with caution.

关键词： biomaterial titanium-niobium binary titanium alloys low Young’s modulus biocompatibility

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