Abstract:This paper deals with a new concept that is Functionally Gradient Materials (FGM). The materials developed in this work are constituted by a 430L matrix core and composite materials with this matrix and gradient concentration with NbC reinforcement, from the core to the surface, through different steps. Composite powders of different content in NbC were produced through high energy milling in order to obtain the gradient composition. The morphology and microhardness of these powders were characterised and subs… Show more
“…Vapor deposition, thermal spraying, centrifugal casting, slip casting, tape casting, gel casting, laser deposition, sedimentation, electrochemical methods, and powder metallurgy (P/M) are the production techniques commonly used for FGMs [5,6]. P/M over other techniques, it has some advantages such as availability of good raw material, suitable for mass production, control of chemical composition, production of porous and complex shapes and metal matrix composites, which are very difficult to produce by casting method due to density difference [7]. In the last few years, among metal-based materials, Al, due to their good thermal and electrical conductivity, high tensile strength-to-weight ratio, high hardness, and ductility properties; is of great interest in structural and functional applications [8,9].…”
Functionally graded materials (FGMs) are advanced engineering materials developed due to their superior properties where traditional composite materials are not sufficient. Nowadays, the development and application of these materials for the potential areas have attracted much more attention. Aluminum (Al) is preferred for physical and mechanical properties such as lightweight, high specific strength, high specific modulus, and low thermal expansion coefficient in these potential applications. Graphene attracts great attention worldwide due to its superior mechanical, electrical and thermal properties. In the current study, fewlayered graphene (FLG) produced with high purity electric arc discharge method were used to reinforce the Al matrix using various (in wt%) of 0, 0.1, 0.2, 0.3, 0.5, and 0.7 FLG by mechanically alloying (MA). Composite powders were consolidated by cold pressing with a layer by layer under 450 MPa. Al-FGM composites were designed including six layers and they were subjected to sintering at approximately 590 °C under argon atmosphere. The microstructure of Al-FGM was investigated by optical microscopy and scanning electron microscopy (SEM). It was observed that the FLG placed between the grains and acts as a barrier through the gradation improving the mechanical properties of the Al-FGM. Hardness value of the layer with the highest graphene content was measured as 113 HV. An increase in the Vickers hardness by 18% was observed in the last layer with FLG content of 0.7 wt% compared to the first layer.
“…Vapor deposition, thermal spraying, centrifugal casting, slip casting, tape casting, gel casting, laser deposition, sedimentation, electrochemical methods, and powder metallurgy (P/M) are the production techniques commonly used for FGMs [5,6]. P/M over other techniques, it has some advantages such as availability of good raw material, suitable for mass production, control of chemical composition, production of porous and complex shapes and metal matrix composites, which are very difficult to produce by casting method due to density difference [7]. In the last few years, among metal-based materials, Al, due to their good thermal and electrical conductivity, high tensile strength-to-weight ratio, high hardness, and ductility properties; is of great interest in structural and functional applications [8,9].…”
Functionally graded materials (FGMs) are advanced engineering materials developed due to their superior properties where traditional composite materials are not sufficient. Nowadays, the development and application of these materials for the potential areas have attracted much more attention. Aluminum (Al) is preferred for physical and mechanical properties such as lightweight, high specific strength, high specific modulus, and low thermal expansion coefficient in these potential applications. Graphene attracts great attention worldwide due to its superior mechanical, electrical and thermal properties. In the current study, fewlayered graphene (FLG) produced with high purity electric arc discharge method were used to reinforce the Al matrix using various (in wt%) of 0, 0.1, 0.2, 0.3, 0.5, and 0.7 FLG by mechanically alloying (MA). Composite powders were consolidated by cold pressing with a layer by layer under 450 MPa. Al-FGM composites were designed including six layers and they were subjected to sintering at approximately 590 °C under argon atmosphere. The microstructure of Al-FGM was investigated by optical microscopy and scanning electron microscopy (SEM). It was observed that the FLG placed between the grains and acts as a barrier through the gradation improving the mechanical properties of the Al-FGM. Hardness value of the layer with the highest graphene content was measured as 113 HV. An increase in the Vickers hardness by 18% was observed in the last layer with FLG content of 0.7 wt% compared to the first layer.
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