Hot deformation flow behavior of powder metallurgy based Al-SiC and Al-Al2O3 composite in a single step and two-step uni-axial compression (original) (raw)
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2021
The response of two different types of aluminium matrix composites (AMCs) reinforced with silicon carbide ceramic particulates or nickel metallic particulates to hot compression testing parameters was evaluated. The composites were produced via two-step stir-casting technique. Axisymmetric compression testing was performed on the samples at different deformation temperatures of 220 and 370 °Ϲ, 0.5 and 5 s−1 strain rates and total strains of 0.6 and 1.2. The initial and post-deformed microstructures were studied using optical and scanning electron microscopy. The results show that flow stress was significantly influenced by imposed deformation parameters and the type of reinforcements used in the AMCs. Nickel particulate reinforced aluminium matrix composite (AMC) showed superior resistance to deformation in comparison with silicon carbide reinforced AMC under the different testing conditions. In both AMCs, work hardening, dynamic recovery and dynamic recrystallisation influenced the...
A study on forging of aluminum-based metal matrix composites
International Journal of Material Forming, 2010
Due to its lightweight and high specific strength, aluminum-based metal matrix composites have drawn much attention from the forging industry for manufacturing structural components. In the present study, the forging formability of the aluminum-based metal matrix composites A6061/Al 2 O 3 was investigated with both the experimental approaches and the finite element analysis. The compression tests were conducted to obtain the stress-strain curves for the A6061/Al 2 O 3 composites at elevated temperatures ranging from the room temperature to 500°C under various strain rates of 0.05s-1 , 0.5s-1 and 5s-1 , respectively. The forging of a structural part with characteristic geometry features, including a circular cup at the top and a boss at the bottom, was also performed in the present study to investigate the forging formability of the A6061/Al 2 O 3 metal-matrix composites. The consistency between the experimental data and the finite element simulation results confirms the validity of the finite element analysis on the forging formability of the A6061/Al 2 O 3 metal-matrix composite and the die design proposed in the present study.
Effect of Forging Condition on Mechanical Properties of Al/SiC Metal Matrix Composites
International Journal of Engineering Research and, 2015
The objective of the research work to investigate effect of forging condition on mechanical properties of Al/SiC composites prepared in open die at the temperature of 450 °C with three different stages then specimens are aged at T6 conditions. Forged specimens subjected tensile, compression and hardness tests to evaluate effect of forging levels on Al/SiC composites. The effect of plastic deformation and high temperature during forging led to a recrystallization of the Al/SiC matrix with a grain refinement. At first and second stage higher grain refine could be seen but at third stage no further grain refinement could be absorbed. The modification of grain which was influenced an enhancement in the mechanical strength. The scanning electron microscope shows the brittle and ductile mixture failure was absorbed in all type of the specimens. Forging improve the mechanical properties with nominal loss of ductility.
Effect of Forging on Aluminum Matrix Nano Composites: A Review
Materials Today: Proceedings, 2017
The Aluminium matrix composites are finding widespread applications in engineering, automobile, aerospace, defence and recreation industries. For last two decades Nano composite, have emerged as high strength advanced materials for the industrial applications. The post processing like forging, rolling, extrusion of these composites further improves their properties in addition to the confirmation to the final shape and size. The present paper discusses the effect of forging of aluminium matrix Nano composites AMNCs. The forging process results in aligned grain flow pattern and smooth metal flow. The recent work reported on Aluminium matrix Nano composites developed by different fabrication processes and further forging process have been reviewed. It has been reported that the best result of forging of AMNCs with SiC reinforcement were found at temperature of 450 o C to 500 o C. The Powder metallurgy suggested for decent mixing of aluminium and Nano ceramic particle.
IJERT-Effect of Forging condition on Mechanical Properties of Al/SiC Metal Matrix Composites
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/effect-of-forging-condition-on-mechanical-properties-of-alsic-metal-matrix-composites https://www.ijert.org/research/effect-of-forging-condition-on-mechanical-properties-of-alsic-metal-matrix-composites-IJERTV4IS050635.pdf The objective of the research work to investigate effect of forging condition on mechanical properties of Al/SiC composites prepared in open die at the temperature of 450 °C with three different stages then specimens are aged at T6 conditions. Forged specimens subjected tensile, compression and hardness tests to evaluate effect of forging levels on Al/SiC composites. The effect of plastic deformation and high temperature during forging led to a recrystallization of the Al/SiC matrix with a grain refinement. At first and second stage higher grain refine could be seen but at third stage no further grain refinement could be absorbed. The modification of grain which was influenced an enhancement in the mechanical strength. The scanning electron microscope shows the brittle and ductile mixture failure was absorbed in all type of the specimens. Forging improve the mechanical properties with nominal loss of ductility.
The deformation characteristics during open-die forging of silicon carbide particulate reinforced aluminium metal matrix composites (SiC p AMC) at cold conditions are investigated. The material was fabricated by liquid stir casting method in which preheated SiC particles were mixed with molten LM6 aluminium casting alloy and casted in the silicon mould. Finally, preforms obtained were machined in required dimensions. Two separate cases of deformation, that is, open-die forging of solid disc and solid rectangular preforms, were considered. Both upper bound theoretical analysis and experimental investigations were performed followed by finite element simulation using DEFORM, considering composite interfacial friction law, barreling of preform vertical sides, and inertia effects, that is, effect of die velocity on various deformation characteristics like effective stress, strain, strain rate, forging load, energy dissipations, and height reduction. Results have been presented graphically and critically investigated to evaluate the concurrence among theoretical, experimental, and finite element based computational findings.
Microstructure and Mechanical Properties of Aluminum Processed by Multi-Axial Compression
Solid State Phenomena, 2011
In the present paper, Al-Al 2 O 3 composite strips are produced by the cold roll bonding process of anodised aluminium strips. This technique has the flexibility to control the volume fraction of metal matrix composites by varying the oxide layer thickness on the anodised aluminium strip. Microhardness, tensile strength and elongation of composite strips are investigated as a function of quantity of alumina and the applied production method. It is found that higher quantities of alumina improve microhardness and tensile strength, while the elongation value decreases negligibly. Furthermore, prerolling annealing is found to be the best method of producing this composite via the cold roll bonding process. Finally, it is found that both monolithic aluminium and aluminium/alumina composite exhibited a ductile fracture, having dimples and shear zones.
Journal of Materials Research and Technology, 2019
Metal matrix composites are an essential product used in engineering materials. This product has wide applications in automotive, aerospace, and other uses. In this paper, four different reinforced such as (MA), (MCA), (NFC) and (SA) with a constant rate of 5 wt. % for each reinforced element used and mixed with Al 6063 alloy to produced composite by using modified two-step mechanical stirrer and having three blades at each step. Coated carbide tool insert was carrying out the turning process. The chip volume ratio and chip shape style formation were performed within cutting speeds of 10 and 90 m/min, which appears in different length and shapes especially at 90 m/min. The chip volume ratio is not increased by all four types of reinforced metal but still maintain in the standard range according to the shape of chips. NFC increasing average chip length during cutting speed of 10 m/min, but within cutting speed of 90 m/min, MA has an important role to change the volume and formation style of a chip from discontinuous chip to continuous chip. It should be noted from the results, that the NFC has decreased surface roughness dramatically for all cutting speeds and followed by MCA, but the MA and SA have less effect compared to NFC and MCA. The mechanical properties such as yield ultimate tensile strength and hardness of the composites are much more than Al 6063 alloy especially when adding all four types of reinforcement together moreover the effect of NFC is very less compared with other types of reinforced materials. MA increase hardness more than the different types of reinforcement. Microstructure observation produces compact grain boundaries with strong grains of metal matrix composites compared to Al 6063 alloys.
Materials Sciences and …, 2010
The wide choice of materials, today's engineers are posed with a big challenge for the right selection of a material and as well as the right selection of a manufacturing process for an application. Aluminium Metal Matrix Composites is a relatively new material among all the engineering materials. It has proved its position in automobile, aerospace, and many other engineering applications due its wear resistance properties and due to its substantial hardness. One of the most important criteria is forgeability by which the workability of the material can be determined. The nature of distribution of reinforcing phase in the matrix greatly influenced the properties of Aluminum Metal Matrix Composites. The forgeability of Aluminum Metal Matrix Composites, which are produced by powder metallurgy method, are greatly depends on the size and percentage of reinforcement materials, compacting load, sintering temperature and soaking time etc. In this present work, the forgeability of Aluminum Metal Matrix Composites reinforced with silicon carbide (400 meshes) has investigated. A comparison have been made with different types of Aluminum Silicon Carbide Metal Matrix Composite materials contains 0%5%,10%,15%&20% by weight of silicon carbide. The mechanical properties like hardness of the different composites have also investigated. It is observed that the forgeabilty of the composites decreases with increasing the wt% of SiC but the mechanical properties like hardness enhanced on increasing the wt% of SiC.
— The deformation flow behavior of 2A14 aluminum alloys during multi-directional forging (MDF) under various cumulative strains (∑Δɛ) has been investigated by combining experiment with finite element method (FEM). The forging process has been performed at 450 o C with a deformation speed of 0.15 mms-1 and a pass strain (Δɛ) of 0.4. Numerical simulations of MDF using a commercial software (DEFORM-3D), have shown that the vortex, cross-flow and fold defect of flow lines of the forgings do not occur during deformation, and the degree of bent and inhomogeneity of flow lines also increase steadily with ∑Δɛ increases. The FEM analysis coincides well with experimental results. The effective strain in various areas of the forgings has been significantly enhanced during MDF. The dynamic recovery is dominant during deformation. The proportion of recrystallized grains and the degree of fragmentation of second phases in various areas of the annealed forgings increase with the increase of effective strain. Keywords— 2A14 aluminum alloy, Multi-directional forging, Flow behavior, Effective strain, DEFORM-3D.