Papers by Keyword: Metal Matrix Composite (MMC)

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Authors: Zoltán Kálazi, Viktória Janó, Gábor Buza
Abstract: Tungsten (W) based alloy composite layer reinforced with TiC particles has been successfully prepared on unalloyed steel sample by LMI technology. In order to obtain in situ produced TiC reinforcement, pure titanium has been introduced to the melt pool. WC powder was added for increasing the carbon content of the layer in order to avoid the softening of the matrix (with low carbon content) during TiC formation. The present study aims to investigate the optimum amount of injected WC and Ti powder to improve wear resistance and hardness of the layer. Samples were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The maximum hardness of the layer has been reached ~900HV in case of 2-4wt% of titanium content. Ti has been collected all of the carbon from the matrix when titanium content was 9,6wt%, which resulted that the austenite and (Fe,W)6C phases have been disappeared. Only α-Fe and TiC phases were presented in the layer. The hardness of the layer reduced to the hardness of the base material.
Authors: Yan Feng Liang, Jing En Zhou, Sheng Quan Dong, Tong Yang
Abstract: Al-4.5 wt. % Cu matrix composites reinforced with in situ SiC particles were synthesized using direct reaction synthesis (DRS). The microstructure and tensile properties of the in situ composites were examined by optical microscopy (OM) and transmission electron microscopy (TEM). The results showed that the in situ SiC particles could be obtained through the appropriate control of the fabrication parameters. The heat released by the formation of TiC effectively promoted the formation of SiC. The size of the in situ SiC particles in the matrix was about 0.2 μm.
Authors: Guillaume Geandier, Moukrane Dehmas, Mickael Mourot, Elisabeth Aeby-Gautier, Sabine Denis, Olivier Martin, Nikhil Karnatak
Abstract: In situ high energy X-ray diffraction synchrotron was used to provide direct analysis of the transformation sequences in steel-based matrix composite (MMC) reinforced with TiC particles. Evolution of the phase fractions of the matrix and TiC particles as well as the mean cell parameters of each phase were determined by Rietveld refinement from high energy X-ray diffraction (ID15B, ESRF, Grenoble, France). In addition, some peaks were further analysed in order to obtain the X-ray strain during the cooling step. Non-linear strain evolutions of each phase are evidenced, which are either associated with differences in the coefficient of thermal expansion (CTE) between matrix and TiC particle or to the occurrence of phase transformation. Micromechanical calculations were performed through the finite element method to estimate the stress state in each phase and outline the effects of differences in CTE and of volume change associated with the matrix phase transformation. The calculated results led to a final compressive hydrostatic stress in the TiC reinforcement and tensile hydrostatic stress in the matrix area around the TiC particles. Besides, the tendencies measured from in situ synchrotron diffraction (mean cell parameters) matched with the numerical estimates.
Authors: Sravan Kumar Josyula, Suresh Kumar Reddy Narala
Abstract: Aluminum based Titanium carbide particulate reinforced metal matrix composite (Al-TiC PMMC) draws attention by many researchers & industries over alloy materials because of its excellent thermo-physical and mechanical characteristics. Despite of its superior properties of Al-TiC MMC, its complexity in manufacturing process and poor machinability has been the main deterrents to its application level. Controlling agglomeration of TiC particles is a challenging task to retain improved microstructure. The hard abrasive nature of carbide particles cause poor machinability and high machining cost. Therefore, in this paper an attempt has been made to study the various manufacturing techniques to achieve uniform distribution of TiC reinforcements in Al matrix.Further, the review follows the secondary manufacturing process of Al-TiC PMMC, which addressee’sthree topics: machining, forming & welding.
Authors: Hajime Iwasaki, Toru Mori, Mamoru Mabuchi, Kenji Higashi
Authors: Ákos Borsik, Katalin K. Kelemen, György Kaptay
Authors: G. Boitier, Jean-Louis Chermant, P. Goeuriot, Y. Laurent, B.L. Mordike, C. Troadec, P. Verdier, Jean Vicens
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