scholarly journals Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process

2021 ◽  
Vol 11 (4) ◽  
pp. 1625
Author(s):  
Ioan Milosan ◽  
Tibor Bedő ◽  
Camelia Gabor ◽  
Daniel Munteanu ◽  
Mihai Alin Pop ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Functionally Graded Materials ◽  
Centrifugal Casting ◽  
Metallic Copper ◽  
Casting Process ◽  
Aluminum Carbide ◽  
Functionally Graded ◽  
Graded Materials ◽  
Sic Particles ◽  
Molten Aluminum Alloy

The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from the consideration that the incorporation of SiC particles in the molten aluminum alloy can be difficult due to the very low wettability of SiC particles. In order to increase their wettability, SiC particles were covered with a layer of metallic copper. The incorporation of SiC particles into the aluminum alloy mass was performed by centrifugal casting. The secondary hypoeutectic Al-Si alloy used in this study was elaborated within the crucible of a resistors heated furnace. The metallic coating of SiC particles, in addition to the effect of increasing their wettability by molten metal, also has a role in preventing the formation of aluminum carbide in case of heating above 700 °C. A great amount of attention was paid to the parameters used during the centrifugal casting process. The results showed that adjusting the proportion of SiC particles within the composite allows us to obtain values of the thermal expansion coefficient within previously established limits. The present work demonstrates that the coating of SiC particles covered with a thin layer of metallic Cu creates the conditions to easily incorporate them into the molten Al mass, thus obtaining FGMs with controlled properties.

Investigation of the microstructure and thermo-mechanical properties of functionally graded materials fabricated by the vibrating centrifugal solid particle method

2021 ◽  
pp. 095440542110641
Author(s):  
Ali Hajisadeghian ◽  
Abolfazl Masoumi ◽  
Ali Parvizi
Keyword(s):  
Mechanical Properties ◽  
Solid Particle ◽  
Functionally Graded Materials ◽  
Centrifugal Casting ◽  
Particle Method ◽  
Outer Radius ◽  
Functionally Graded ◽  
Graded Materials ◽  
Sic Particles ◽  
Inner Radius

In this research, SiC/Al A413.1 functionally graded materials (FGMs) were fabricated by the vibrating centrifugal solid particle method (VCSPM), and the effects of the SiC particles on the microstructure and thermo-mechanical properties of an A413.1 aluminium alloy were investigated. The benefits of a vibration during centrifugal casting of FGMs are illustrated. After designing and fabricating the centrifugal casting machine, cylindrical FGM specimens were produced using the centrifugal solid particle method (CSPM) and VCSPM. This study used SiC particles with an average particle size from 50 to 62 μm as reinforcements to fabricate A413.1-10 wt% SiC functionally gradient composites at three annular mould speeds (900–1500 and 2100 rpm) and with or without a vibration of the mould. The Brinell hardness was measured; the yield strength (YS), ultimate tensile strength (UTS) and Young’s modulus (E) were determined by tensile testing; the density was determined by the Archimedes method; and the thermal expansion coefficients were measured with a dilatometer. A comparison of the samples produced by the conventional method and VCSPM shows a significant reduction in the porosity and an increase in the distribution gradient of the reinforcing particles for the VCSPM case. It can be concluded that in both processes, the mechanical and thermal properties improved in most cases by moving from the inner radius to the outer radius because of the movement of particles towards the outer radius from the centrifugal force. The results also show that the use of a vibration dramatically increased the rate and speed of migration of gas bubbles towards the inner radius, and the mechanical properties (hardness, YS, UTS and E) improved by moving from the inner to outer radius due to an increase in the percentage of silicon carbide particles. Upon increasing the velocity and using the VCSPM, the slope of these changes becomes steeper than those for the vibration-free mode and at low rotation speeds.

Effects of Particle Size on Fabrication of Al-TiO2 Functionally Graded Materials by Centrifugal Mixed-Powder Method

2016 ◽  
Vol 879 ◽  
pp. 1691-1697 ◽  
Author(s):  
Hisashi Sato ◽  
Junya Maeda ◽  
Motoko Yamada ◽  
Yoshimi Watanabe
Keyword(s):  
Particle Size ◽  
Wear Resistance ◽  
Functionally Graded Materials ◽  
Casting Process ◽  
Functionally Graded ◽  
The Other ◽  
Mixed Powder ◽  
Graded Materials ◽  
Powder Method ◽  
Al Matrix

As one of processing methods of functionally graded materials (FGMs), centrifugal mixed-powder method has been proposed. The centrifugal mixed-powder method is the casting process combined of centrifugal casting and powder metallurgy. This processing method has advantage that fine ceramics-particles, whose wettability with matrix melt is low, can be compounded into metallic material. However, effects of particle size on microstructure and mechanical properties of the FGMs fabricated by the centrifugal mixed-powder method are unclear. In this study, two kinds of Al-TiO2 FGMs rings are fabricated by the centrifugal mixed-powder method. One contains TiO2 particles having similar diameter with Al matrix particles (hereafter, small different-size (SD) TiO2 particles), and the other one compounds TiO2 particles with much smaller diameter than Al matrix particles (hereafter, large different-size (LD) TiO2 particles). In case of the Al-TiO2 FGMs ring containing SD-TiO2 particles, the TiO2 particles are homogeneously dispersed in Al matrix on outer surface of the ring. On the other hand, the TiO2 particles in the Al-TiO2 FGMs ring with LD-TiO2 particles are distributed along grain boundary of Al matrix. Moreover, Vickers-hardness and wear resistance around outer surface of the Al-TiO2 FGMs ring containing the SD-TiO2 particles is higher than that of the Al-TiO2 FGMs ring with LD-TiO2 particles. Since Al particles in the mixed-powder with LD-TiO2 particles are surrounded by the TiO2 particles, the Al particles can be hardly melted by heat of molten Al at casting process. As a result, the Al-TiO2 FGMs ring with LD-TiO2 particles has low hardness and wear resistance. Therefore, it is found that TiO2 particles having similar diameter with Al matrix particles are more suitable for fabrication of the Al-TiO2 FGMs rings.

Carbon nanotubes-reinforced aluminum alloy functionally graded materials fabricated by powder extrusion process

2019 ◽  
Vol 745 ◽  
pp. 379-389 ◽  
Author(s):  
Dasom Kim ◽  
Kwangjae Park ◽  
Kyungju Kim ◽  
Takamichi Miyazaki ◽  
Sungwook Joo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aluminum Alloy ◽  
Functionally Graded Materials ◽  
Extrusion Process ◽  
Functionally Graded ◽  
Graded Materials

Investigation of Particle Segregation and Solidification Time in FGM's Using Centrifuge Casting Technique

2015 ◽  
Vol 766-767 ◽  
pp. 956-961
Author(s):  
K.S. Chethan ◽  
S. Kiran Aithal ◽  
A. Madhusudan ◽  
Rao Shailesh
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Particle Distribution ◽  
Centrifugal Casting ◽  
Casting Process ◽  
Functionally Graded ◽  
Particle Segregation ◽  
Graded Materials ◽  
Influence Of Process Parameters ◽  
Casting Technique

Functionally Graded Materials (FGM) is a newly evolved concept to get desired properties in the material wherein the intermediate layer is transient since the particle size distribution gradually changes. Centrifugal casting [1] can produce only hollow shapes and Centrifuge casting can produce solid shape FGM very effectively. The study of particle distribution in a fluid using centrifuge casting process is carried out considering sand as particle and its distribution is studied under water, for different viscosity values and for viscosity varying with respect to temperature. Based on centrifugal force and density difference, an attempt has been made to mathematically model the centrifuge casting force to estimate the particle distribution over the length of the specimen and also to assess the influence of process parameters such as rotational speed (G-force) and density of the particles.

scholarly journals Characterization of Fabricated FG Pipe with Natural Fiber-Flyash-Epoxy using Centrifugal Casting

2019 ◽  
Vol 8 (11) ◽  
pp. 734-741 ◽  
Keyword(s):  
Fly Ash ◽  
Functionally Graded Materials ◽  
Natural Fiber ◽  
Centrifugal Casting ◽  
Functionally Graded ◽  
Powder Materials ◽  
Optimized Design ◽  
Cylindrical Pipe ◽  
Graded Materials ◽  
Banana Stem

This research presents the design of fabrication technique for hollow pipe made up of functionally graded materials and its characterization. In the first part, a horizontal centrifugal casting model is designed and developed using CATIA package. After getting an optimized design the fabrication work is performed in workshop. Different powder materials (Banana stem fiber, Jute fiber and Fly ash) are prepared by considering different chemical treatment and physical process. Different powder sizes (300µ, 150µ, 75µ, 53µ, 45µ) are considered to fabricate current functionally graded cylindrical pipe by altering their weight percentage. The different weight percentages (5%, 7.5%, 10%, 12.5%, 15% of Banana stem and 2.5%, 5%, 7.5%, 10%, 12.5% of Fly Ash) of constituents are considered for fabricating FGM cylindrical pipe. By altering the constituent of FGM material composition, twelve numbers of various functionally graded materials (FGMs) pipes are fabricated. In the second part, the material characterization is performed using different testing machines in Laboratories. Mechanical properties (Compression test and Micro hardness test) and physical properties (Density test, Water absorption test and thermal conductivity test) are investigated. Furthermore, the microstructures of the fabricated FGNF pipes are examined using Scanning Electron Microscope (SEM).

Computer Simulation of Centrifugal Casting Process Using FLOW-3D

2015 ◽  
Vol 830-831 ◽  
pp. 53-56
Author(s):  
J. Aneesh Kumar ◽  
K. Krishnakumar ◽  
S. Savithri
Keyword(s):  
Mold Wall ◽  
Centrifugal Casting ◽  
Casting Process ◽  
Functionally Graded ◽  
Complex Flow ◽  
Flow Process ◽  
Graded Materials ◽  
Filling Sequence ◽  
Cylindrical Casting ◽  
Manufacturing Techniques

Centrifugal casting process is one of the potential manufacturing techniques used for producing functionally graded materials viz., composite materials or metallic materials which have high differences of density among constituents. In this process, the fluid flow plays a major role and understanding the complex flow process is a must for the production of defect-free castings. Since the mold spins at a high velocity and the mold wall being opaque, it is impossible to visualise the flow patterns in real time. Hence, in the present work, the commercial CFD code FLOW-3DTM, has been used to simulate the mold filling sequence for a simple hollow cylindrical casting during vertical centrifugal casting process. Effect of various spinning velocities on the fill pattern during vertical centrifugal casting process is being investigated.

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