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      저자 : Paramsothy, M. (검색결과 2 건)
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      • The tensile deformation and fracture behavior of a magnesium alloy nanocomposite reinforced with nickel

        Srivatsan, T.S.,Manigandan, K.,Godbole, C.,Paramsothy, M.,Gupta, M. Techno-Press 2012 Advances in materials research Vol.1 No.3

        In this paper the intrinsic influence of micron-sized nickel particle reinforcements on microstructure, micro-hardness tensile properties and tensile fracture behavior of nano-alumina particle reinforced magnesium alloy AZ31 composite is presented and discussed. The unreinforced magnesium alloy (AZ31) and the reinforced nanocomposite counterpart (AZ31/1.5 vol.% $Al_2O_3$/1.5 vol.% Ni] were manufactured by solidification processing followed by hot extrusion. The elastic modulus and yield strength of the nickel particle-reinforced magnesium alloy nano-composite was higher than both the unreinforced magnesium alloy and the unreinforced magnesium alloy nanocomposite (AZ31/1.5 vol.% $Al_2O_3$). The ultimate tensile strength of the nickel particle reinforced composite was noticeably lower than both the unreinforced nano-composite and the monolithic alloy (AZ31). The ductility, quantified by elongation-to-failure, of the reinforced nanocomposite was noticeably higher than both the unreinforced nano-composite and the monolithic alloy. Tensile fracture behavior of this novel material was essentially normal to the far-field stress axis and revealed microscopic features reminiscent of the occurrence of locally ductile failure mechanisms at the fine microscopic level.

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        Investigation on the Controlled Degradation and Invitro Mineralization of Carbon Nanotube Reinforced AZ31 Nanocomposite in Simulated Body Fluid

        A. Madhan Kumar,S. Fida Hassan,Ahmad A. Sorour,M. Paramsothy,M. Gupta 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

        Magnesium (Mg) based implant materials are believed to be the perfect candidates for biomedical applications due to theirversatile properties. However, regulating their corrosion/degradation rate in the biological surroundings is still a noteworthytask. Suitable strategies to overcome this task is to wisely select alloy elements with improved corrosion resistanceand mechanical characteristics. An attempt has been made to enhance the corrosion and biocompatibility performance ofmagnesium alloy AZ31 containing carbon nanotubes (CNTs) as reinforcement and evaluate its degradation and invitromineralization performance in physiological medium. Corrosion behavior of AZ31 alloy with CNTs reinforcement wasinvestigated using electrochemical methods, weight loss, and hydrogen evolution in SBF during short and long-term periods. The obtained results revealed that the corrosion resistance of AZ31 alloy enhanced significantly due to the incorporationof CNTs. Hydrogen evolution test and weight loss tests revealed that the presence of CNTs improves the stability of theMg(OH)2 and efficiently regulate the degradation behavior in SBF. Surface characterization after immersion in SBF revealedthe rapid formation of bone-like apatite layer on the surface, validated a good bioactivity of the AZ31 nanocomposite samples.

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