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Author: search.filters.author.Singh S.B.Subject: search.filters.subject.Heat treatment

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    Influence of in situ TiB reinforcements and role of heat treatment on mechanical properties and biocompatibility of ? Ti-alloys
    (2012) Majumdar P.; Singh S.B.; Dhara S.; Chakraborty M.
    The effect of heat treatment on the mechanical properties of Ti-35Nb-5.7Ta-7.2Zr (TNZT) and Ti-35Nb-5.7Ta-7.2Zr-0.5B (TNZTB) alloys has been investigated. In the case of TNZT alloy, the presence of ? phase in the matrix has a greater effect on strength and hardness than the presence of secondary ? precipitates. The TNZTB alloy shows higher hardness and tensile strength than the TNZT alloy due to the formation of hard TiB precipitates in the matrix of the former. However, the boron free alloy offers higher ductility than the boron containing alloy. Presence of TiB precipitates in the matrix increases the strength of the TNZTB alloy when ? precipitates are present in the matrix. However, the boride precipitates have no substantial influence on the strength of the TNZTB alloy when ? phase in the matrix is replaced by the ? phase. The elastic modulus of the TNZT samples shows a very small variation with different heat treatment conditions. The TNZT alloy samples containing ? and ? phases show higher elastic modulus than the samples containing ? and ? phases. The elastic modulus of the TNZTB alloy is higher than that of the TNZT alloy due to the formation of high modulus TiB particles in the matrix. Both the alloys show better cell adhesion and spreading than the control material (polystyrene). However, the boron free Ti-alloy shows better cell attachment than the boron containing Ti-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.