scholarly journals MORE DETAILSABOUT IMPREGNATION OF CARBON GRAPHITE WITH ALUMINUM

2020 ◽  
pp. 77-82
Author(s):  
V. A. Gulevsky ◽  
N. Yu. Miroshkin ◽  
S. N. Tsurikhin ◽  
O. Yu. Gundrov
Keyword(s):  
Composite Material ◽  
Aluminum Alloy ◽  
Protective Coating ◽  
Open Porosity ◽  
Matrix Alloy ◽  
Lead Alloy ◽  
Inner Surface ◽  
The Matrix ◽  
Porous Frame ◽  
Constant Heating

The process of forming a composite material carbon - graphite-aluminum alloy by impregnation of a porous frame AG-1500 is studied. The technology of filling the open porosity of carbon graphite with a metal melt in a device for impregnation in the mode of constant heating of the furnace is described. The method of applying a protective coating to the inner surface of the pores is shown. It is possible to seal the matrix alloy AK12 in the pores of AG-1500 with lead. It is shown that such processing allows to compact the aluminum alloy and modify it due to the comprehensive pressure of the lead alloy.

scholarly journals Particularities of structure formation of aluminum-copper composite materials manufactured by casting technology

2020 ◽  
pp. 116-121
Author(s):  
V. A. Kalinichenko ◽  
A. S. Kalinichenko ◽  
S. V. Grigoriev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structure Formation ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Alloying Elements ◽  
Casting Technology ◽  
The Matrix ◽  
Reinforcing Material ◽  
Copper Composite

To create friction pairs operating in severe working conditions, composite materials are now increasingly used. Composite materials obtained with the use of casting technologies are of interest due to the possibility to manufacture wide range of compositions at low price compared to powder metallurgy. Despite the fact that many composite materials have been sufficiently studied, it is of interest to develop new areas of application and give them the properties required by the consumer. In the present work the composite materials on the basis of silumin reinforced with copper granules were considered. Attention was paid to the interaction between the matrix alloy and the reinforcing phase material as determining the properties of the composite material. The analysis of distribution of the basic alloying elements in volume of composite material and also in zones of the interphases interaction is carried out. The analysis of the possibility of obtaining a strong interphase zone of contact between the reinforcing component and the matrix material without significant dissolution of the reinforcing material is carried out.

Interaction of elements in carbon-graphite—Al—Mg—Zn—Cu melt system under combined action of temperature and pressure

2021 ◽  
pp. 514-518
Author(s):  
N.Yu. Miroshkin ◽  
V.A. Gulevsky ◽  
S.N. Tsurikhin ◽  
A.I. Bogdanov ◽  
L.M. Gurevich ◽  
...  
Keyword(s):  
Matrix Alloy ◽  
Impregnation Process ◽  
Active Elements ◽  
Cu Alloy ◽  
Inner Surface ◽  
The Matrix ◽  
Combined Action ◽  
Temperature And Pressure ◽  
The Difference ◽  
Titanium Compounds

Redistribution of chemically active elements is established on its inner surface of pores and at the interface with the alloy when impregnating carbon-graphite framework with Al—Mg—Zn—Cu alloy at temperature of 800 °C under pressure of up to 3 MPa. In this case, change in the solubility of melt elements in aluminum is possible as result of the combined action of temperature and pressure in the impregnation process, created due to the difference in the coefficients of thermal and thermal expansion of the matrix alloy, and the material of the impregnation device during impregnation. Titanium compounds are found in the pores filled with metal that are not added to the matrix alloy, but are formed as result of the contact of the matrix alloy melt with the walls of the impregnation device.

Precipitate phases in an Al-SiC composite

1984 ◽  
Vol 42 ◽  
pp. 490-491
Author(s):  
S.R. Nutt ◽  
R.W. Carpenter
Keyword(s):  
Fracture Toughness ◽  
Composite Material ◽  
Alloy Powder ◽  
Heat Treating ◽  
Matrix Alloy ◽  
Al Alloy ◽  
Unreinforced Alloy ◽  
The Matrix ◽  
Sic Whiskers ◽  
Sic Composites

The modulus of many aluminum alloys can be greatly increased by the addition of small amounts of silicon carbide. The resulting composite material is also stronger than the unreinforced alloy, but exhibits poor fracture toughness. The reason for the low ductility of Al-SiC composites is unknown, although results presented here indicate that embrittling phases present in the matrix alloy may be partially responsible. The purpose of this work has been to study the distribution of precipitate phases in Al-SiC composites, focusing particular attention on interface regions. The material studied was fabricated by adding SiC whiskers to a 2124 Al alloy powder, consolidating, then heat treating to a T6 temper.

Bending Properties of AA7055 Aluminum Alloy Reinforced with In Situ TiB2 Particles

2012 ◽  
Vol 535-537 ◽  
pp. 1005-1010 ◽  
Author(s):  
Dong Chen ◽  
Zhe Chen ◽  
Peng Zhang ◽  
Yi Jie Zhang ◽  
Haiheng Ma ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Bending Strength ◽  
Matrix Alloy ◽  
Bending Properties ◽  
The Matrix ◽  
Dislocation Strengthening ◽  
Mixed Salts ◽  
Unreinforced Matrix

In-situ TiB2 particles reinforced AA7055 composites were fabricated through mixed-salts route and their bending properties were studied. The composites reinforced with 5 wt % and 10 wt% TiB2 exhibit higher bending strength than the unreinforced matrix alloy. The improvement in bending strength may be attributed to dislocation strengthening, Orowan strengthening, and grain strengthening. The good bonding between the reinforcements and the matrix also plays an important role.

The Effect of Aging and the Protective Coating on the Oxidation Behavior of 6061Al/SiC Composite at High Temperatures

2011 ◽  
Vol 462-463 ◽  
pp. 30-35
Author(s):  
S. Rajasekaran ◽  
N.K. Udayashankar ◽  
Jagannath Nayak
Keyword(s):  
Composite Material ◽  
Grain Boundary ◽  
Oxidation Resistance ◽  
High Temperatures ◽  
Protective Coating ◽  
Oxidation Behavior ◽  
Protective Coatings ◽  
Measurement Techniques ◽  
Aluminum Coating ◽  
The Matrix

This paper analyses the effect of ageing on the oxidation behavior of 6061Al/SiC composite material at temperatures ranging from 500 to 800 K. Also aluminum coating is employed as protective coating in order to improve the oxidation resistance of the composite. SEM, EDAX, XRD and stepped oxidation measurement techniques are used to study the oxidation behavior and to characterize the composite specimens. Oxidation of the composite material without protective coatings is seen to be very rapid during the initial stages of exposure to the high temperatures but subsequently slowed down due to the formation of a protective surface layer of oxide. Among the artificially aged composites, peak aged specimens are more prone to oxidation. The oxidation was especially severe above 600 K. The interface between the matrix and reinforcement particles and the grain boundary regions of the matrix enhance this oxidation process since they provided sites for oxidation initiation. Aluminum coating on the composite obtained by DC magnetron sputtering technique, reduce the oxidation rate effectively since the interface regions between the matrix and reinforcement, grain boundary regions of the matrix are unexposed to the atmosphere. Aluminum coating provides better oxidation resistance for the artificially aged composites.

Multi-Scale Strength Evaluations of SiC Particle Reinforced Aluminum Alloy by Using FEM Superposition Method

2008 ◽  
Vol 33-37 ◽  
pp. 731-736
Author(s):  
Maigefeireti Maitireyimu ◽  
Masanori Kikuchi ◽  
Mamtimin Gheni
Keyword(s):  
Composite Material ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Geometric Distribution ◽  
Interface Fracture ◽  
Superposition Method ◽  
Multi Scale ◽  
Material Analysis ◽  
The Matrix ◽  
Sic Particle

This article presents a modified FEM Superpostion method (S-FEM) for composite material analysis. Around the reinforcement body, failure and interface fracture may occur in the matrix. So the S-FEM was employed to detect the stress distribution around the reinforcement. One particle in big matrix is studied. Area of twice of particle radium is selected as local field.First, the feasibility of modified S-FEM is verified. And by symmetric analysis, geometric distribution of particle which may influence on the strength of composite material were discussed.

Tensile Properties of 15wt. %TiB2/7055 Composite Fabricated by In Situ Method

2013 ◽  
Vol 842 ◽  
pp. 165-169 ◽  
Author(s):  
Dong Chen ◽  
Cong Zou ◽  
Yi Jie Zhang ◽  
Nai Heng Ma ◽  
Hao Wei Wang
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Matrix Alloy ◽  
In Situ Method ◽  
The Matrix ◽  
7055 Aluminum Alloy

7055 aluminum alloy reinforced with 15wt. % TiB2 particulates was synthesized by in situ method, the microstructure and tensile properties were investigated. There are a few particulate clusters in the matrix. The elastic modulus and hardness of the composite are higher than that of the matrix alloy, but the yield strength and ultimate tensile strength decrease. The decrease of strength is attributed to the presence of TiB2 particulate cluster and residual reaction slag.

scholarly journals FEATURES OF CARBON GRAPHITE IMPREGNATION WITH ALUMINUM ALLOY

2020 ◽  
pp. 61-65
Author(s):  
V. A. Gulevsky ◽  
N. Yu. Miroshkin ◽  
S. N. Tsurikhin ◽  
N. A. Kidalov
Keyword(s):  
Composite Material ◽  
Electronic Structure ◽  
Aluminum Alloy ◽  
Pore Surface ◽  
Aluminum Melt ◽  
Impregnation Process ◽  
Conduction Electrons ◽  
Nickel Chromium ◽  
Combined Action ◽  
Porous Frame

The process of forming a composite material carbon-graphite-aluminum by impregnating a porous frame AG-1500 with aluminum melt at a temperature of 650С is studied. The redistribution of elements of the impregnating alloy is established. it is shown that the transition of silicon, Nickel, chromium, and iron from the aluminum melt to the «melt - pore surface of carbon graphite» is determined not by the mechanism of chemical localization of conduction electrons, but by the rearrangement of the electronic structure of components during crystallization. In this case, it is possible to change the solubility of the melt elements in aluminum, as a result of the combined action of pressure and temperature on it during the impregnation process.

scholarly journals Experimental Studies on Mechanical Properties of Carbon Nanotube Reinforced Aluminum 7075 Composite Material

2021 ◽  
Vol 53 (6) ◽  
pp. 210611
Author(s):  
Mahendra Kumar Chidananda Swamy ◽  
Raghavendra Bommanahalli Venkatagiriyappa
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Compression Strength ◽  
Experimental Studies ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Multiwalled Carbon ◽  
Casting Technique ◽  
The Matrix ◽  
Aluminum 7075

In the present work multiwalled carbon nanotubes were  added as  reinforcement to aluminum 7075 matrix at 0.5%, 0.75% and 1.25% by weight proportion through stir casting technique. The mechanical properties of the produced composite were studied. The composite has considerably good tensile and wear resistance properties and hence finds its best suited application in aircraft frame and wings structures. Microstructure analysis through SEM showed a uniform distribution of the reinforcement material in the matrix. XRD graphs were taken at selected points during microscopic studies to determine the chemical composition of the matrix alloy, the reinforcement and the composite. The experimental results showed that 1.25% reinforcement in the composite material exhibited a tensile strength of 560 N/mm2 and a compression strength of  649.6 N/mm2 as the highest among the compositions. Thus,  the reinforcement addition at 1.25% improved the tensile and compression strength of the composite material.

Microstructure of graphite fibre reinforced aluminum matrix composites

1988 ◽  
Vol 46 ◽  
pp. 988-989
Author(s):  
K.-T. Chang ◽  
J.H. Mazur
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Composite Material ◽  
Aluminum Alloy ◽  
Graphite Fiber ◽  
Fiber Reinforced ◽  
Alloy Matrix ◽  
6061 Aluminum Alloy ◽  
The Matrix ◽  
Aluminum Alloy Matrix

The mechanical properties of fiber reinforced materials are determined by the mechanical properties of the individual components (i.e., the fiber and the matrix) and by the nature of the interface between these components. The interface is responsible for the transfer of the stress between the fiber and the matrix and, consequently, an understanding of the microstructure is essential in order to predict the performance of the composite system.In this work we report our preliminary investigations of the microstructure of graphite fiber reinforced 6061 aluminum alloy matrix composite material. The composite material was prepared in the form of a wire 0.65 mm in diameter from mesophase pitch base graphite fiber embedded in 6061 aluminum alloy matrix (A1 97.87%, Si 0.6%, Cu 0.28%, Mg 1.0%, Cr 0.2%, other trace elements 0.05%). Observations of the microstructure were performed on longitudinal and transverse sections of the composite material wire using light microscopy, scanning electron microscopy and transmission electron microscopy.

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