Research Publications

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Author: search.filters.author.Chakraborty M.Subject: search.filters.subject.Tensile properties

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    Influence of neodymium addition on the microstructure, mechanical and thermal properties of Mg-Si alloys
    (2013) Ajith Kumar K.K.; Viswanath A.; Pillai U.T.S.; Pai B.C.; Chakraborty M.
    The present work aims to investigate the influence of neodymium addition on the microstructure, mechanical and thermal properties of Mg-Si alloys. Different proportions of (0.3, 0.6, 0.9 and 1.2 wt.%) Nd has been added to the hypo (Mg-1.15Si) and hypereutectic (Mg-6Si) alloys. The microstructural studies reveal that the Nd additions change the size and morphology of Mg-halos in the hypoeutectic Mg-Si alloy. In the hypereutectic alloy, the Nd additions considerably reduce the size of the primary Mg2Si phase besides, modifying the Mg2Si morphology from a coarse dendritic to a polyhedral shape. The amount of Nd required for the optimal modification of both alloys is experimentally determined. Increase in mechanical properties obtained with Nd addition is correlated with the microstructural refinement. To understand the microfracture mechanism, the SEM analysis has been carried out. � 2013 The Authors.
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    The role of heat treatment on microstructure and mechanical properties of Ti-13Zr-13Nb alloy for biomedical load bearing applications
    (2011) Majumdar P.; Singh S.B.; Chakraborty M.
    The suitability of heat treated Ti-13Zr-13Nb (TZN) alloy for biomedical load bearing applications has been investigated. Depending upon the heat treatment conditions, the microstructure of TZN alloy mainly consists of ?, ? or ?" martensite phases. In general, for all the deformation and solution treatment temperatures the variation of the hardness and tensile strength with cooling rate is similar. The elastic modulus of TZN alloy decreases with an increase in cooling rate from the solution treatment temperature. Relatively fine ?+? microstructure increases the hardness and tensile strength. The presence of martensite and/or retained ? in the microstructure decreases the hardness and elastic modulus and increases the ductility substantially whereas higher amount of ? phase in the matrix increases the elastic modulus. Decomposition of martensite and retained ? into ? phase during aging increases the hardness, elastic modulus and tensile strength and decreases the ductility. Among the samples studied, the aged TZN sample, which was deformed and solution treated at 800 �C followed by water quenching, is a promising candidate for the application as implant material. � 2011 Elsevier Ltd.