Characteristics of Functionally Graded Bimetallic Aluminium Alloys by Sequential Casting Technique

2015 ◽  
Vol 830-831 ◽  
pp. 383-386 ◽  
Author(s):  
Akhil S. Karun ◽  
Hari Sanil ◽  
T.P.D. Rajan ◽  
Uma Thanu Subramonia Pillai ◽  
B.C. Pai
Keyword(s):  
Functionally Graded Materials ◽  
Aluminium Alloys ◽  
Functional Performance ◽  
Cast Alloy ◽  
Structural Materials ◽  
Functionally Graded ◽  
Effect Of Temperature ◽  
Graded Materials ◽  
Casting Technique ◽  
Alloy Cast

Light weight aluminium alloys and low-density materials have drawn the attention of researchers as potential structural materials for transportation sector due to the requirement of effective reduction in fuel consumption, stringent emission norms and higher payload capacity. Functionally Graded Materials (FGM) provides variation in properties and better functional performance within a component. Sequential casting is fairly a new technique to produce functionally graded materials and components by controlled mould filling process. Bimetallics of aluminium alloys are prepared by sequential casting using A390-A319 alloy (cast-cast alloy) and A390-A6061 alloy (cast-wrought alloy) combination and solidified under gravity. The effect of temperature of the two melts and gap between pouring of the melts on microstructure and properties of the bimetals are investigated. The microstructures show good interface bonding between the two different alloy metals. The hardness testing shows higher hardness at hypereutectic alloy region. The process described in this study shows potential and effective approach to create good bonding between two different aluminium alloys to develop advanced functional and structural materials which can be used in various automobile components to reduce the overall weight of the vehicle, by which better fuel efficiency and performance can be achieved.

Thermal Post-Buckling of Laminated Plates Comprising Functionally Graded Materials With Temperature-Dependent Properties

2004 ◽  
Vol 71 (6) ◽  
pp. 839-850 ◽  
Author(s):  
K. M. Liew ◽  
J. Yang ◽  
S. Kitipornchai
Keyword(s):  
Functionally Graded Materials ◽  
Differential Quadrature Method ◽  
Shear Deformation Theory ◽  
Functionally Graded ◽  
Laminated Plates ◽  
Effect Of Temperature ◽  
Temperature Dependent ◽  
Graded Materials ◽  
Post Buckling ◽  
Temperature Dependent Properties

This paper presents thermal buckling and post-buckling analyses for moderately thick laminated rectangular plates that contain functionally graded materials (FGMs) and subjected to a uniform temperature change. The theoretical formulation employs the first-order shear deformation theory and accounts for the effect of temperature-dependent thermoelastic properties of the constituent materials and initial geometric imperfection. The principle of minimum total potential energy, the differential quadrature method, and iterative algorithms are used to obtain critical buckling temperatures and the post-buckling temperature-deflection curves. The results are presented for both symmetrically and unsymmetrically laminated plates with ceramic/metal functionally graded layers, showing the effects of temperature-dependent properties, layup scheme, material composition, initial imperfection, geometric parameters, and boundary conditions on buckling temperature and thermal post-buckling behavior.

Application of Functionally Graded Materials for Solid Insulator: Fabrication, Optimization Design, and Surface Flashover of Prototype Samples

2013 ◽  
Vol 291-294 ◽  
pp. 2308-2312 ◽  
Author(s):  
Nan Li ◽  
Ji Huan Tian ◽  
Wei Deng ◽  
Hui Gang Sun
Keyword(s):  
Functionally Graded Materials ◽  
Optimization Design ◽  
Functionally Graded ◽  
Dielectric Constants ◽  
Layer By Layer ◽  
Graded Materials ◽  
Casting Technique ◽  
Surface Flashover ◽  
Solid Insulator ◽  
Lightning Impulse

The applicability of functionally graded materials (FGM) for solid insulator of gas insulated switchgear (GIS) was investigated. First, a new fabrication method based on layer-by-layer casting technique was demonstrated to prepare FGM insulator possessing spatial distribution of dielectric constants. Then, electric field strength in the FGM spacer model was calculated and optimized by using finite element method (FEM). Three types of truncated cone spacers were fabricated according to the optimization results. Finally, surface flashover tests were performed under AC voltage and lightning impulse voltage applications. Results in both circumstances indicated an evident improvement of flashover voltage when FGM insulator was employed. As a result, we verified the fabrication technique and the applicability of FGM insulator for enhancement of insulation performance in GIS device.

scholarly journals Development and Characterization of New Functionally Graded Aluminium Alloys

2021 ◽  
Author(s):  
Elisa Fracchia ◽  
Mario Rosso
Keyword(s):  
Aluminium Alloys ◽  
Compositional Analysis ◽  
Tensile Tests ◽  
Functionally Graded ◽  
Graded Materials ◽  
Casting Technique ◽  
Automotive Components ◽  
Metallurgical Bonding ◽  
Zn Addition

Nowadays, aluminium alloys are adopted mainly to produce engineering and automotive components. The present investigation aims to design, cast and characterize novel functionally graded materials (FGMs) produced using Al-Mg and Al-Si alloys by gravity casting technique. Alloys were sequentially cast into a mould to obtain an FGM to realizing great mechanical and metallurgical bonding. Zn addition was further performed in FGM to increase the mechanical properties, thanks to the nucleation of the intermetallic phases MgZn2. Castings were subsequently mechanically tested by tensile tests, bending tests, hardness and microhardness measures to assess the products\' quality. Microstructural characterizations were performed along the FGM to assess the metallurgical bonding and evaluate the microstructures obtained. Fracture, microstructural and compositional analysis will highlight the quality of this new FGM proposed. Possible applications of these materials are suggested, as automotive pistons or structural components.

Dynamic Analysis with Stress Recovery for Functionally Graded Materials: Numerical Simulation and Experimental Benchmarking

2014 ◽  
Vol 2 (1) ◽  
pp. 21
Author(s):  
Carlos Alberto Dutra Fraga Filho ◽  
Fernando César Meira Menandro ◽  
Rivânia Hermógenes Paulino de Romero ◽  
Juan Sérgio Romero Saenz
Keyword(s):  
Numerical Simulation ◽  
Dynamic Analysis ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Stress Recovery ◽  
Graded Materials
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