The Influence of Reinforcement Purity on Corrosion Resistance of AM50/SiC Composites

2015 ◽  
Vol 227 ◽  
pp. 43-46 ◽  
Author(s):  
Kinga Kamieniak ◽  
Marcin A. Malik
Keyword(s):  
Silicon Carbide ◽  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Matrix Alloy ◽  
Technical Grade ◽  
Magnesium Matrix Composites ◽  
Sic Particles ◽  
The Matrix ◽  
Grade Silicon ◽  
The One

The microstructure and corrosion behaviour of AM50/SiC magnesium matrix composites reinforced with SiC particles were investigated. Composites containing 10 wt. % of SiC were fabricated by means of gravity casting. Technical grade silicon carbide used for the composites fabrication was subjected to a purification procedure leading to the removal of iron containing impurities from its surface. The corrosion resistance of the composite with purified SiC particles was compared to the corrosion resistance of the one containing crude technical grade silicon carbide as well as to the corrosion resistance of the matrix alloy. Voltammetry and an electrochemical noise technique as well as hydrogen evolution rate measurements were utilized for that purpose. Corrosion tests were performed in 0.5 mol dm3 NaCl saturated with Mg (OH)2. It has been demonstrated that the composite containing purified SiC was less susceptible to corrosion than the one containing crude SiC particles. Both composites were less resistant to corrosion than their matrix itself. Regardless of a purity level of SiC which was used for the composites fabrication, the same constituents were revealed in their microstructure, namely: α-phase (a solid solution of aluminium in magnesium), fully divorced eutectic α + γ (where γ-phase is Al12Mg17), intermetallic compound Al8Mn5 and SiC particles uniformly distributed in the whole volume of the matrix.

Influence of Particles Type and Shape on the Corrosion Resistance of Aluminium Hybrid Composites

2012 ◽  
Vol 191 ◽  
pp. 81-87 ◽  
Author(s):  
Anna J. Dolata ◽  
Maciej Dyzia ◽  
Witold Walke
Keyword(s):  
Corrosion Resistance ◽  
Hybrid Composites ◽  
Corrosion Behaviour ◽  
Matrix Alloy ◽  
Combustion Engines ◽  
Alloy Matrix ◽  
Nacl Concentration ◽  
The Matrix ◽  
Aluminium Alloy Matrix

AMCs due to good thermal and tribological properties, they are applied as the material for: pistons in modern combustion engines, drive shafts, shock absorber cylinders and brake nodes. Heavy-duty operation, especially under tribological conditions, frequently in corrosive environment, requires knowledge on their corrosion resistance. This paper presents the initial results of the research on susceptibility of aluminium alloy matrix composite material reinforced by SiC particles and mixture of SiC+C particles to corrosion. The purpose of the research was to determine the influence of reinforcing phases, their type and shape on corrosion behaviour in a typical corrosion environment, with low NaCl concentration, in relation to the matrix alloy. Determination of corrosion resistance of Al/SiC+C hybrid composite is a new issue and falls within the field of interest of the authors of this article.

Processing, Microstructure and Mechanical Properties of SiCp/AZ91 Mg Matrix Composites Fabricated by Squeeze Casting

2007 ◽  
Vol 546-549 ◽  
pp. 499-502
Author(s):  
X. Qiu ◽  
Xiao Jun Wang ◽  
Ming Yi Zheng ◽  
Kun Wu
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Squeeze Casting ◽  
Volume Fraction ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Magnesium Matrix Composites ◽  
The Matrix ◽  
Az91 Magnesium ◽  
Different Diameters

The fabrication processing, mechanical properties and fracture characters of SiCp/AZ91 magnesium matrix composites fabricated by squeeze casting were investigated. The SiC particles with different diameters (5μm, 20μm and 50μm) were employed as the reinforcement in the composites, the volume fraction of them was 50% in all cases. Experimental results showed that when the size of SiC particle decreased, the tensile properties of the composite increased. The tensile properties of SiCp/AZ91 composite with small particles are controlled by the properties of matrix alloy and the strength of the interface between the matrix and reinforcements, but the composites reinforced by large particles are controlled by the fracture of the particles.

Analysis of the Effects of Dynamic Alloying on the Structure of Aluminium and its Alloys

2021 ◽  
Vol 320 ◽  
pp. 8-13
Author(s):  
Yulia Usherenko ◽  
Viktor Mironov ◽  
Sergey Usherenko
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
High Speed ◽  
Matrix Material ◽  
Structure Change ◽  
Cosmic Dust ◽  
Structural Elements ◽  
High Speed Stream ◽  
Sic Particles ◽  
The Matrix

The dynamic alloying of aluminum and its alloy with a high-speed stream of silicon carbide (SiC) particles simulates the effect of a stream of cosmic dust on spacecraft materials. The study showed a structure change in the volume of aluminum and its alloy and the formation of new structural elements. The transformation of the structure during dynamic alloying leads to a change of the composition and mechanical properties of the matrix material.

Effect of SiC Nanoparticles Content and Milling Time on the Characteristics of Al/SiC Nanocomposite Powders Produced via Mechanical Milling

2013 ◽  
Vol 829 ◽  
pp. 505-509 ◽  
Author(s):  
Farshad Akhlaghi ◽  
Sareh Mosleh-Shirazi
Keyword(s):  
Crystal Size ◽  
Milling Time ◽  
Matrix Alloy ◽  
High Energy ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Sic Nanoparticles ◽  
Sic Particles ◽  
The Matrix ◽  
Nanocomposite Powders

In the present study high energy ball milling was utilized to produce aluminum (Al-6061) matrix nanocomposite powders reinforced with nanosilicon carbide (SiC) particles. The starting materials containing different percentages (1,3 or 5 wt.%) of nanoSiC particles (25-50 nm) and Al (38-63 μm) were co-milled for different times (16, 20, 24 h) to achieve nanocomposite powders. The crystal size of powders were evaluated by quantitative XRD analysis. Laser particle size analysis was used to evaluate the size of powders during milling. The microstructure of powders and their microhardness values were evaluated by Scanning Electron Microscopy (SEM) and a microhardness tester respectively. The results indicated that the crystal size of the matrix alloy decreased by milling time. The increased SiC content up to 3% resulted in increased microhardness of the powders. However, further increase of SiC to 5% resulted in decreased microhardness due to agglomeration. It was concluded that the maximum microhardness together with a uniform distribution of SiC particles within the matrix alloy was obtained after 20 h milling of powder mixture containing 3% of SiC nanoparticles.

Effects of Destabilisation Heat Treatment on Microstructure, Hardness and Corrosion Behaviour of 18wt.%Cr and 25wt.%Cr Cast Irons

2015 ◽  
Vol 658 ◽  
pp. 76-80 ◽  
Author(s):  
Amporn Wiengmoon ◽  
Torranin Chairuangsri ◽  
John T.H. Pearce
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Eutectic Structure ◽  
Air Cooling ◽  
Cast Irons ◽  
Eutectic Carbides ◽  
The Matrix ◽  
Superior Corrosion Resistance ◽  
Dendritic Austenite

Effects of destabilisation heat treatment on microstructure, hardness and corrosion resistance of 18wt.%Cr and 25wt.%Cr irons have been investigated. The as-cast samples were heat-treated by destabilisation at 1000°C for 4 hour and then air cooling. The microstructure was investigated by light microscopy and scanning electron microscopy. The results show that the as-cast microstructure in 18wt.%Cr iron consists of pearlite, formed by decomposition of primary dendritic austenite, plus eutectic structure. In the 25wt.%Cr iron with lower hardness, the microstructure consists of primary dendritic austenite plus eutectic structure. The austenite had partly transformed to martensite, especially at areas adjacent to eutectic carbides. After destabilisation, the microstructure of both irons consists of eutectic and secondary carbides in a martensite matrix giving increased hardness. It was found that corrosion resistance of the irons was improved after destabilisation. The 25wt.%Cr showed superior corrosion resistance than the 18wt.%Cr iron due to greater residual Cr in the matrix to encourage passivity.

Effect of addition of SiC particles on the Microstructure and Hardness of Al-SiC composite

10.30544/590 ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 49-56
Author(s):  
Hareesha G ◽  
N Chikkanna ◽  
Saleemsab Doddamani ◽  
Anilkumar S Kallimani
Keyword(s):  
Silicon Carbide ◽  
Stir Casting ◽  
Age Hardening ◽  
Particulate Composites ◽  
Matrix Composites ◽  
Hardness Testing ◽  
Casting Technique ◽  
Sic Particles ◽  
The Matrix ◽  
Aluminum Silicon Carbide

This work aims to investigate the effect of the addition of silicon carbide particles on the microstructure and the hardness of the Al-SiC metal matrix composites. The said composite is prepared using the stir casting technique for different weight percentages of the SiC particles. The higher composition of the reinforcement causes the clustering of the particles in the matrix. Thus, research has to be carried out on the aluminum-silicon carbide composites with the reinforcement 3wt%, 6wt%, 9wt%, and 12wt% of SiC particles to obtain the optimized composition. In order to study the microstructure and the reinforcement distribution in the matrix, a scanning electron microscope is utilized. The hardness testing has been carried out using the Vickers’ indentation technique for the as-cast and age hardening conditions. From the microstructural study, it is observed that the microstructure of the said composite exhibits the uniform distribution of the reinforcement. The EDX results show the presence of the reinforcing elements in the Al-SiC composite. From the results obtained from the hardness testing, it is observed that the presence of the carbide element in the composite increases the hardness of the Al-SiC particulate composites.

Structure Investigation of Ball Milled Composite Powder Based on AlSi5Cu2 Alloy Chips Modified by Sic Particles

2013 ◽  
Vol 58 (2) ◽  
pp. 437-441 ◽  
Author(s):  
M. Śusniak ◽  
J. Karwan-Baczewska ◽  
J. Dutkiewicz ◽  
M. Actis Grande ◽  
M. Rosso
Keyword(s):  
Silicon Carbide ◽  
Processing Time ◽  
Composite Powder ◽  
Homogeneous Distribution ◽  
Carbide Powder ◽  
Sic Particles ◽  
Aluminum Chips ◽  
The Matrix ◽  
Aluminum Solid Solution ◽  
Average Size

The paper is focused on the processing of aluminum alloy chips using powder metallurgy. Chips obtained from recycled AlSi5Cu2 alloy were ball milled with the addition of silicon carbide powder with an average size of 2μm. Mechanical alloying process was employed to obtain homogeneous composite powder. The effect of processing time (0 - 40h) on the homogeneity of the system was evaluated, as well as a detailed study of the microstructure of AlSi5Cu2 aluminum chips and SiC particles during MA was carried out. Addition of silicon carbide (10, 20wt%) to recycled aluminium chips and application of MA lead to fragmentation of the homogeneous composite powder down to particle size of about 3μm and spheroidization. The addition of hard SiC particles caused reinforcement and reduced the milling time. Higher content of silicon carbide and longer processing time allowed to obtain AlSi5Cu2/SiC powders with microhardness ∽500HV0,025. The results of MA were investigated with SEM, EDS, LOM, XRD and showed that relatively homogeneous distribution of SiC reinforcements in the matrix as well as grain refinement of aluminum solid solution down to 50nm can be obtained after 40h of processing.

Effect of Mg Content on the Characteristics of Al/SiC Nanocomposite Powders Produced via In Situ Powder Metallurgy Method

2011 ◽  
Vol 471-472 ◽  
pp. 420-425 ◽  
Author(s):  
Mohammad Moazami-Goudarzi ◽  
Farshad Akhlaghi
Keyword(s):  
Powder Metallurgy ◽  
Influencing Factor ◽  
Metallic Matrix ◽  
Matrix Alloy ◽  
Powder Metallurgy Method ◽  
Sic Particles ◽  
The Matrix ◽  
Average Size ◽  
Mg Content

In the present study the effect of Mg addition on the characteristics of Al/SiC nanocomposite powder particles produced via a relatively new method called in situ powder metallurgy (IPM) is investigated. Commercially pure Al and Al-Mg alloy melts containing different amounts of Mg were used as the matrix alloy. Nano-sized SiC particles with the average size of 60 nm were used as the reinforcing material. The effect of Mg content on the fluidity of the melt as an influencing factor affecting both the process yield and wettability of SiC with molten metal was investigated. The size distribution of produced powders was characterized using a laser particle size analyzer. Scanning electron microscopy was utilized to investigate the possibility of embedding of SiC nanoparticles within the metallic matrix. Results of microhardness measurements together with SEM micrographs and EDS analysis showed that nano-sized SiC particles could be embedded in the relatively coarse Al-Mg powders containing at least 1 wt.% Mg.

Study on Microstructure and Properties of Coating on the Surface of Fe14Mn6Si5Ni Alloy

2016 ◽  
Vol 693 ◽  
pp. 605-610
Author(s):  
Y. Shen ◽  
Hong Xiang Wang
Keyword(s):  
Solid Solution ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Matrix Alloy ◽  
Egg White ◽  
Pack Cementation ◽  
A Value ◽  
The Matrix ◽  
Order Of Magnitude ◽  
Al Powder

In this paper, the coating was prepared by the slurry pack cementation on the surface of Fe-14Mn-6Si-5Ni alloy at 900°C for 10 h. A slurry pack cementation mixture was composed of Cr2O3 used as chrominizing source, pure Al powder as reducer, an activator of NH4Cl and albumen (egg white) as cohesive agent. The microstructure, wear resistance and corrosion resistance of coating has been studied. The results showed that the microstructure of the coating is composed of solid solution with Al and Cr; the microhardness of coating with a value of 460 HV was 1.4 time than that of the matrix alloy, friction coefficient of the coating was 0.35, 1/2 of that of matrix alloy, and the rate of corrosion of coating was lower one order of magnitude than that of the FeMnSi based alloy.

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