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    Influence of boron addition to Ti-13Zr-13Nb alloy on MG63 osteoblast cell viability and protein adsorption
    (2015) Majumdar P.; Singh S.B.; Dhara S.; Chakraborty M.
    Cell proliferation, cell morphology and protein adsorption on near ?-type Ti-13Zr-13Nb (TZN) alloy and Ti- 13Zr-13Nb-0.5B (TZNB) composite have been investigated and compared to evaluate the effect of boron addition which has been added to the Ti alloy to improve their poor tribological properties by forming in situ TiB precipitates. MG63 cell proliferation on substrateswith different chemistry but the same topography was compared. TheMTT assay test showed that the cell viability on the TZN alloy was higher than the boron containing TZNB composite after 36 h of incubation and the difference was pronounced after 7 days. However, both the materials showed substantially higher cell attachment than the control (polystyrene). For the same period of incubation in fetal bovine serum(FBS), the amount of protein adsorbed on the surface of boron free TZN sampleswas higher than that in the case of boron containing TZNB composite. The presence of boron in the TZN alloy influenced protein adsorption and cell response and they are lower in TZNB than in TZNas a result of the associated difference in chemical characteristics. � 2014 Elsevier B.V. All rights reserved.
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    Effects of heat treatment on evolution of microstructure of boron free and boron containing biomedical Ti-13Zr-13Nb alloys
    (2012) Majumdar P.
    In the present study, the effects of heat treatment on the microstructure of Ti-13Zr-13Nb (TZN) and Ti-13Zr-13Nb-0.5B (TZNB) alloys have been investigated. Depending on the heat treatment conditions, the microstructure of the heat treated TZN alloy consisted mainly of elongated and/or equiaxed ?, ? or martensite. Slow cooling (furnace or air cooling) from the solution treatment temperature produced ? and ? phases in the microstructure. Rapid cooling (water quenching) resulted in martensite and retained ? when the solution treatment temperature was above or close to ? transus. However, martensite was not formed after water quenching from a solution treatment temperature which was below ? transus due to partitioning effect of the alloying elements. Increasing the cooling rate from the furnace cooling to the air cooling led to finer microstructure. Aging of water quenched samples transformed the martensite, if present, into ? and ?, and the morphology of ? phase changed from elongated to equiaxed and enhanced the growth of ?. The microstructure of all the TZNB samples consisted of dispersed precipitated particles of TiB in the matrix. The majority of the boride particles showed an acicular (needle like) morphology. The other phases present in the TZNB alloy were similar to those in the similarly heat treated TZN alloy. Moreover, a growth of ? phase was observed in the microstructure of TZNB alloy when compared with that of TZN alloy. � 2012 Elsevier Ltd.
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    Effect of heat treatment and boron addition on corrosion behavior of Ti-35Nb-7.2Zr-5.7Ta (wt%) ?-titanium alloy in simulated body fluid
    (2011) Majumdar P.; Singh S.B.; Chatterjee U.K.; Chakraborty M.
    The corrosion behavior of Ti-35Nb-7.2Zr-5.7Ta (TNZT) and Ti-35Nb-7.2Zr-5.7Ta-0.5B (TNZTB) alloys subjected to different heat treatment conditions was investigated in Hank's solution. Depending on the heat treatment conditions, the microstructure of the water-quenched, single-stage aged or duplex aged samples consists of very small amounts of ? or a precipitates in equiaxed � grains. Addition of boron to the TNZT alloy results in the formation of dispersed precipitates of titanium boride (TiB) in the � matrix. The other features present in the TNZTB alloy are similar to those in the TNZT alloy. Compared with single aging, duplex aging decreases the corrosion potential (Ecorr) and substantially decreases corrosion current density (icorr) and passive current density (ipass) values. Addition of boron to the TNZT alloy shifts the Ecorr value toward a more active direction and increases the icorr as well as ipass values significantly, and therefore deteriorates the corrosion resistance of the titanium alloys. In general, duplex aged TNZT samples show better corrosion resistance than other heattreated TNZT or TNZTB samples. � 2011, NACE International.
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    The influence of heat treatment and role of boron on sliding wear behaviour of β-type Ti-35Nb-7.2Zr-5.7Ta alloy in dry condition and in simulated body fluids
    (2011) Majumdar P.; Singh S.B.; Chakraborty M.
    The wear behaviour of heat-treated Ti-35Nb-7.2Zr-5.7Ta (TNZT) and Ti-35Nb-7.2Zr-5.7Ta-0.5B (TNZTB) alloys (all compositions are in wt%) was investigated in dry condition and in simulated body fluids. It has been found that there is no straightforward relationship between the wear rate and the microstructure. The hardness has no appreciable effect on the wear behaviour of these alloys. The presence of boron in the TNZT alloy deteriorates its wear properties. The wear rate of TNZT and TNZTB alloys in various media increases in the following sequence: dry condition < Hank's solution < bovine serum. © 2010 Elsevier Ltd.