Laser Deposition of In Situ Ti – TiB Composites

Banerjee, Rajarshi; Collins, Peter C.; Fraser, Hamish L.

doi:10.1002/1527-2648(20021105)4:11<847::aid-adem847>3.0.co;2-c

Cited by 56 publications

(18 citation statements)

References 10 publications

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“…Another set of two images from the same location, recorded using two different two-beam imaging conditions are shown in Figure 7(b,c). Thus, while Figure 7(b) shows the two-beam bright-field image recorded using g ϭ (011)␤ near the [3][4][5][6][7][8][9][10][11]␤ zone axis, Figure 7(c) has been recorded using g ϭ (Ϫ1-21)␤ near the [3][4][5][6][7][8][9][10][11]␤ zone axis. The dislocation contrast within the shear band, running almost parallel to the edge of the TEM foil, is visible in Figure 7(b) but is invisible in the same region in Figure 7(c).…”

Section: Resultsmentioning

confidence: 99%

Laser‐deposited Ti‐Nb‐Zr‐Ta orthopedic alloys

Banerjee

Nag

Samuel

et al. 2006

J Biomedical Materials Res

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The complex quaternary Ti-35Nb-7Zr-5Ta orthopedic alloy has been successfully deposited from a powder feedstock consisting of a blend of elemental titanium, niobium, zirconium, and tantalum powders, using the laser engineered net-shaping (LENStrade mark) process. In the as laser-deposited form, these alloys exhibit a substantially higher tensile strength as compared with more conventionally processed counterparts of similar composition, while maintaining excellent ductility and a low modulus. Furthermore, the as-deposited alloys appear to exhibit a <001> texture, with a substantially large number of grains of the beta phase aligning one of their <001> axes nearly normal to the substrate or parallel to the growth direction. The microstructure of the as-deposited as well as tensile-tested alloys have been characterized in detail using scanning electron microscopy (SEM), orientation microscopy (OM), and transmission electron microscopy (TEM). Formation of a high density of shear bands, possibly arising from slip localization due to precipitates of the omega phase in the beta matrix, is clearly evident in the tensile-tested sample. The enhanced tensile strength and low modulus in these laser-deposited alloys coupled with the ability to form near-net shape components makes LENS an attractive processing technology for orthopedic implants.

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Section: Resultsmentioning

confidence: 99%

Laser‐deposited Ti‐Nb‐Zr‐Ta orthopedic alloys

Banerjee

Nag

Samuel

et al. 2006

J Biomedical Materials Res

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“…Since the LENS™ process uses a powder feedstock, it allows the flexibility to deposit blends of elemental powders to create alloys in situ . Recent experiments demonstrate the success in depositing homogeneous alloys and metal‐matrix composites with refined microstructures using the LENS™ process 4–7…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance and in vitro response of laser‐deposited Ti‐Nb‐Zr‐Ta alloys for orthopedic implant applications

Samuel

Nag

Nasrazadani

et al. 2010

J Biomedical Materials Res

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While direct metal deposition of metallic powders, via laser deposition, to form near-net shape orthopedic implants is an upcoming and highly promising technology, the corrosion resistance and biocompatibility of such novel metallic biomaterials is relatively unknown and warrants careful investigation. This article presents the results of some initial studies on the corrosion resistance and in vitro response of laser-deposited Ti-Nb-Zr-Ta alloys. These new generation beta titanium alloys are promising due to their low elastic modulus as well as due the fact that they comprise of completely biocompatible alloying elements. The results indicate that the corrosion resistance of these laser-deposited alloys is comparable and in some cases even better than the currently used commercially-pure (CP) titanium (Grade 2) and Ti-6Al-4V ELI alloys. The in vitro studies indicate that the Ti-Nb-Zr-Ta alloys exhibit comparable cell proliferation but enhanced cell differentiation properties as compared with Ti-6Al-4V ELI.

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“…Such an additive manufacturing process is expected to have a substantial impact on the development of the next generation orthopedic implants, as it can rapidly and efficiently manufacture custom-designed complex implants but also functionally-grade them to exhibit required site-specific properties (Hedges, 2003). Recent experiments demonstrate the success in depositing homogeneous alloys and metal-matrix composites, primarily from pre-alloyed powder feedstock, using LENS TM (Griffith et al, 1999;Schwendner et al, 2001;Banerjee et al, 2002a;Banerjee et al, 2002b;Collins et al, 2003).…”

Section: Introductionmentioning

confidence: 99%