Influence of Si addition on the microstructure and mechanical properties of Ti–35Nb alloy for applications in orthopedic implants

Tavares, Andréa M.G.; Ramos, W.S.; Blas, Juan Garcia de; Lopes, Éder Sócrates Najar; Caram, Rubens; Batista, Wilton Walter; Souza, S.A.

doi:10.1016/j.jmbbm.2015.06.035

Cited by 32 publications

(16 citation statements)

References 53 publications

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“…Specifically, prior-β grain size reduction is targeted to improve properties such as yield strength, ductility and toughness [15]. Previous research [16][17][18][19][20] has demonstrated that silicon is effective in improving the β-grain density through constitutional supercooling for cast titanium alloys. At the time of writing, there is no commercial grain refining technology available or a clear understanding within the field of the factors that promote effective grain refinement of solidified ALM components.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Grain refinement of wire arc additively manufactured titanium by the addition of silicon

Mereddy

Bermingham

StJohn

et al. 2017

Journal of Alloys and Compounds

134

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This study demonstrates that silicon additions are effective in refining the microstructure of additive layer manufactured (ALM) titanium components. The addition of up to 0.75wt% silicon to commercially pure titanium manufactured by wire arc ALM results in a significant reduction of the prior-β grain size. It is observed that silicon also reduces the width of the columnar grains and allows for the nucleation of some equiaxed grains through the development of constitutional supercooling and growth restriction. The grain size of the ALM components is compared to a casting process and it is found that the as-deposited microstructure produced during ALM exhibits larger average grain sizes. Using the Interdependence model for predicting grain size, it was determined that the population of nucleant particles that naturally occur in titanium, has comparable potency (i.e. ability to activate at a similar undercooling) regardless of the processing method, however, the ALM process contains fewer, sufficiently potent, nucleant particles than for the casting process due to the effect of subsequent cycles of remelting and heating.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Grain refinement of wire arc additively manufactured titanium by the addition of silicon

Mereddy

Bermingham

StJohn

et al. 2017

Journal of Alloys and Compounds

134

View full text Add to dashboard Cite

show abstract

“…Therefore, Si element in the β-Ti phase prefers to nucleate and grow in the FSNR during cooling process. The connected and coarse Ti 5 Si 3 particles are certainly harmful to the properties of the composites 25 .…”

Section: Resultsmentioning

confidence: 99%

Controllable two-scale network architecture and enhanced mechanical properties of (Ti5Si3+TiBw)/Ti6Al4V composites

Yang

Huang

Duan

et al. 2016

Sci Rep

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Novel Ti6Al4V alloy matrix composites with a controllable two-scale network architecture were successfully fabricated by reaction hot pressing (RHP). TiB whiskers (TiBw) were in-situ synthesized around the Ti6Al4V matrix particles, and formed the first-scale network structure (FSNS). Ti5Si3 needles (Ti5Si3) precipitated in the β phase around the equiaxed α phase, and formed the secondary-scale network structure (SSNS). This resulted in increased deformation compatibility accompanied with enhanced mechanical properties. Apart from the reinforcement distribution and the volume fraction, the ratio between Ti5Si3 and TiBw fraction were controlled. The prepared (Ti5Si3 + TiBw)/Ti6Al4V composites showed higher tensile strength and ductility than the composites with a one-scale microstructure, and superior wear resistance over the Ti6Al4V alloy under dry sliding wear conditions at room temperature.

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“…11) However, excess Si addition decreases the ductility of titanium alloys drastically when the silicide particles form a network along the prior ¢ grain boundaries, inducing intergranular embrittlement. 12,13) Therefore, some researchers optimized the Si content in each titanium alloy, but the reported optimum contents are not unified in the range of less than 1 mass%, 1214) indicating that it probably depends on the type of alloys. The Ti-170Si and Ti-170.3Si ingots were heated in argon atmosphere at 1188 K and then hot forged into cuboid and hot rolled into plates with approximately 80% reduction in thickness in air.…”

Section: Samples Preparationmentioning

confidence: 99%

Suppression of Grain Boundary α Formation by Addition of Silicon in a Near-β Titanium Alloy

et al. 2019

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The effect of Si addition on the microstructure and mechanical properties of a near-¢ titanium alloy Ti-17 with fully lamella microstructure was investigated. It was found that the microstructure of Ti-17 with silicon exhibited the absence of a continuously thick ¡ layer along prior-¢ grain boundaries (grain boundary ¡), while the grain boundary ¡ was distinctively formed in Ti-17 without Si. The formation of (Ti, Zr) silicide particles at the prior-¢ grain interior and its grain boundaries were observed, and the presence of these particles were related to the disappearance of grain boundary ¡ similar to the oxygen scavenging effect of boride particles reported previously. With regard to mechanical properties, Ti-17 with silicon exhibits higher strength and lower ductility compared with Ti-17 without Si. Ductile transgranular fracture morphology was observed even on the fracture surface of Ti-17 with Si after tensile test. [

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Influence of Si addition on the microstructure and mechanical properties of Ti–35Nb alloy for applications in orthopedic implants

Cited by 32 publications

References 53 publications

Grain refinement of wire arc additively manufactured titanium by the addition of silicon

Grain refinement of wire arc additively manufactured titanium by the addition of silicon

Controllable two-scale network architecture and enhanced mechanical properties of (Ti5Si3+TiBw)/Ti6Al4V composites

Suppression of Grain Boundary α Formation by Addition of Silicon in a Near-β Titanium Alloy

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