Browsing by Author "Jha S.K."

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    Deformation behavior of semi-solid forged A356�5TiB2 nano-in situ composites
    (2019) Deepak Kumar S.; Chatttee A.; Jha S.K.; Singh N.K.; Mandal A.
    The research work investigates the application of semi-solid metal processing (SSMP) to predict the deformation behavior of semi-solid A356�5TiB2 nano-in situ composites. The semi-solid forging of A356�5TiB2 in situ composites was carried out in three steps. In the first step, cooling slope (CS) casting setup was developed to generate the non-dendritic feedstock of the composites for subsequent thixoforging. In the second step, differential thermal analysis was used to estimate the semi-solid temperature range in order to achieve partial remelting temperatures and solid fraction profiles of the composites. In the final step, the non-dendritic feedstock of the composites was thixoforged with different % reductions ranging from 30 to 50%. It is noted that the semi-solid A356�5TiB2 nano-in situ composites with 40% deformation attained the ultimate tensile strength (UTS) of 318 MPa, in peak aged condition which is about 110.6% compared to gravity-cast alloy. This is attributed due to the presence of nano-TiB2 particles in the semi-solid forged A356�5TiB2 in situ composite, which clearly indicates the influence of semi-solid forging on the deformation behavior and tensile properties of composites. � Springer Nature Singapore Pte Ltd. 2019.
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    Fatigue analysis of A356-TiB2 (5wt%) in-situ nano composites
    (2019) Deepak Kumar S.; Jha S.K.; Karthik D.; Mandal A.
    In the present work, Low-cycle fatigue (LCF) tests were performed on A356 Aluminium alloy and A356-TiB2(5wt%) in-situ nano-composites to estimate their fatigue performance. The tests were performed by strain controlled with a strain ratio of Re = -1. The cyclic stress-strain curves were determined for each imposed strain levels. The LCF and their characterization in the cyclic plastic response of both the alloy and composites were analysed. It is interesting to note that the type of cyclic deformation behaviour in Al-Mg-Si alloys seems to be influenced by the dispersed phases and TiB2 particles. The LCF values for the A356-TiB2(5wt%) composites were found to be higher than those of the A356 alloy. The separation fatigue life's of the A356-TiB2(5wt%) in-situ nano-composite and A356 alloy was found to be 15652 and 12350 cycles respectively. This is attributed due to the presence of minute TiB2 particles which obviously affected the microstructure, hardness, tensile strength and fatigue life of the composites compared to the base alloy. It is further noted that the LCF values of the present composites were found to be higher than those of the alloys reported in the literature. � 2019 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of International Conference on Nanotechnology: Ideas, Innovations & Initiatives-2017 (ICN:3i-2017).