scholarly journals Manufacturing and Mechanical Behavior of (Al/SiC) Functionally Graded Material using Powder Metallurgy Technique

2019 ◽  
Vol 8 (9) ◽  
pp. 1835-1839 ◽  
Keyword(s):  
Powder Metallurgy ◽  
Functionally Graded Materials ◽  
Pure Aluminum ◽  
Weight Ratio ◽  
Mesh Size ◽  
High Hardness ◽  
High Strength ◽  
Functionally Graded ◽  
Graded Materials ◽  
Wide Range

This research focuses on manufacturing and mechanical characterization of functionally graded materials using powder metallurgy techniques. Owing to its low density and high strength to weight ratio, pure aluminum with mesh size No. 200 is chosen as the matrix. Silicon carbide with mesh size No. 220, which has a wide range of applications due to its high hardness, is selected as reinforcement. Specimens of two functionally graded materials(FGM) with 4 layers (0%, 3%, 7%, 10%)(FGM-1) and 5 layers (10%, 20%, 30%, 40%, 50%) (FGM-2) are sintered by varying the SiC composition from layer to layer. From the microstructure, it is clearly evident that four layered specimens achieved more homogeneous mixture than five layered. Also, mechanical properties of four layered specimens attained better results than five layered specimens.

Modeling of functionally graded materials to estimate effective thermo-mechanical properties

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Royal Madan ◽  
Shubhankar Bhowmick
Keyword(s):  
Experimental Data ◽  
Functionally Graded Materials ◽  
Coefficient Of Thermal Expansion ◽  
Functionally Graded ◽  
Graded Materials ◽  
Content Type ◽  
Wide Range ◽  
Metal Metal ◽  
Novel Material ◽  
First Time

Purpose Functionally graded materials are a special class of composites in which material are graded either continuously or layered wise depending upon its applications. With such variations of materials, the properties of structure vary either lengthwise or thickness wise. This paper aims to investigate models for effective estimation of material properties, as it is necessary for industries to identify the properties of composites or functionally graded materials (FGM’s) before manufacturing and also to develop novel material combinations. Design/methodology/approach Available models were compared for different material combinations and tested with experimental data for properties such as Young’s modulus, density, coefficient of thermal expansion (CTE) and thermal conductivity. Combinations of metal–ceramic and metal–metal were selected such that their ratios cover a wide range of materials. Findings This study reveals different models will be required depending on the material used and properties to be identified. Practical implications The results of the present work will help researchers in the effective modeling of composites or FGM’s for any analysis. Originality/value This paper presents a comparison and review of various analytical methods with experimental data graphically to find out the best suitable method. For the first time, the Halpin-Tsai model was extended in the analysis of the CTE which shows good approximations.

Neutron Diffraction Studies of Residual Stresses in Functionally Graded Alumina/Zirconia Ceramics

2008 ◽  
Vol 571-572 ◽  
pp. 309-314 ◽  
Author(s):  
Petr Lukáš ◽  
Miroslav Vrána ◽  
Jef Vleugels ◽  
Guy Anné ◽  
Omer Van der Biest
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
High Performance ◽  
Construction Material ◽  
High Hardness ◽  
High Strength ◽  
Functionally Graded ◽  
Graded Materials ◽  
Lattice Strains ◽  
Constituent Phase

Graded Al2O3/Y-ZrO2 ceramics are developed to receive a construction material combining favourable properties of both constituent components, alumina (low wear rate, high hardness) and zirconia (high strength and toughness). The high performance of this material can be reached by optimising the internal residual stress distribution resulting mainly from phase specific stresses after cooling from the sintering temperature. For this purpose, non-destructive neutron diffraction mapping of residual stresses has been employed. However, the application of the conventional method does not provide straightforward results on macroscopic residual stresses. This experimental technique uses the crystal lattice plane as a built in microscopic strain gauge and the measured quantities are then lattice strains detected in each constituent phase separately. Based on these experimental resources, the paper proposes a procedure of separation of the residual macroscopic stress from phase specific stresses. The application of the presented method is demonstrated on functionally graded materials (FGM) prepared by electrophoretic deposition (EPD).

Tungsten/Copper Functionally Graded Materials: Possible Applications and Processing through the Powder Metallurgy Route

2007 ◽  
Vol 534-536 ◽  
pp. 1569-1572 ◽  
Author(s):  
O. Ozer ◽  
J.M. Missiaen ◽  
Celine Pascal ◽  
Sabine Lay ◽  
Jean Marc Chaix ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Composition Gradient ◽  
Graded Materials ◽  
Layer Material ◽  
Cu Migration ◽  
Sintering Behaviour ◽  
Powder Metallurgy Route

Processing of W-Cu graded materials from attritor-milled W-CuO mixtures is described. The powder reduction steps are investigated by TG and XRD analyses and by microstructural observations (SEM, TEM). Sintering of reduced powder with different compositions is analysed by dilatometry. Sintering behaviour of the graded component processed by co-compaction of a 10/20/30wt%Cu multi-layer material is briefly discussed. Liquid Cu migration is observed and smoothes the composition gradient. Perspectives to control this migration are discussed.

Investigation for the Fracture Process of WCp/Cu Functionally Graded Materials under Three-Point-Bending

2013 ◽  
Vol 683 ◽  
pp. 17-20
Author(s):  
Hai Ting Xia ◽  
Rong Xin Guo ◽  
Feng Yan ◽  
Hai Yu ◽  
Yu Bo Zhang
Keyword(s):  
Powder Metallurgy ◽  
Functionally Graded Materials ◽  
Fracture Process ◽  
Bottom Layer ◽  
Functionally Graded ◽  
Graded Materials ◽  
Bending Tests ◽  
Bending Performance ◽  
Three Point Bending ◽  
Graded Layers

In this paper, the fracture process of WCp/Cu functionally graded materials(FGMs) was investigated. The used materials were fabricated by powder metallurgy using tungsten carbide(WC) particles and copper(Cu) matrix, and had functionally graded layers. In order to investigate the fracture process of the FGM, three-point-bending tests of rectangular specimens were carried out. From the results, it can be seen that the bending performance of FGM structures with increasing WC content from head layer to the bottom layer excels that of FGM structures with decreasing WC content in three-point-bending tests.

Controlling microstructure

Impact ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 46-47
Author(s):  
Takahiro Kunimine
Keyword(s):  
Mechanical Properties ◽  
Materials Science ◽  
High Hardness ◽  
High Strength ◽  
Assistant Professor ◽  
Functionally Graded ◽  
Japan Society ◽  
Graded Materials ◽  
Coarse Grains ◽  
Properties Of Materials

Most conventional materials have a microstructure comprised of minute, usually coarse, grains. One branch of materials science targets this microstructure as a means to manipulating the mechanical properties of materials to offer greater strength and hardness. Dr Takahiro Kunimine, an Assistant Professor from the Faculty of Mechanical Engineering at Kanazawa University, has recently completed a project focused on using severe plastic deformation (SPD) to develop nanostructured materials with high strength. His current project has been focusing on processing functionally graded materials with high hardness and toughness by additive manufacturing. These works, supported by Japan Society for the Promotion of Science (JSPS) KAKENHI grant, led to the development of much stronger materials.

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