Development of Mg/Cu Nanocomposites Using Microwave Assisted Powder Metallurgy Technique

Materials ◽  
2005 ◽  
Author(s):  
W. L. E. Wong ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Physical And Mechanical Properties ◽  
Microstructural Characterization ◽  
Radiant Heat ◽  
Powder Metallurgy Technique ◽  
Microwave Assisted ◽  
The Matrix ◽  
Rapid Sintering ◽  
Nano Size

In the present study, magnesium composites containing different amount of nano-size copper particulates were successfully synthesized using powder metallurgy technique coupled with a novel microwave assisted rapid sintering. Mg/Cu nanocomposites were sintered using a hybrid heating method consisting of microwaves and radiant heat from external susceptors. The sintered specimens were hot extruded and characterized in terms of microstructural, physical and mechanical properties. Microstructural characterization revealed minimal porosity and the presence of a continuous network of nano-size Cu particulates decorating the particle boundaries of the metal matrix. Mechanical characterization revealed that the addition of nano-size Cu particulates lead to an increase in hardness, 0.2% yield strength (YS) and ultimate tensile strength (UTS) of the matrix. An attempt is made in the present study to correlate the effect of increasing presence of nano-size Cu reinforcement on the microstructural, physical and mechanical properties of monolithic magnesium.

Development of High Performance Mg/SiC Composites Containing Nano-Size SiC Using Microwave Assisted Rapid Sintering

Aerospace ◽  
2005 ◽  
Author(s):  
W. L. E. Wong ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Coefficient Of Thermal Expansion ◽  
Physical And Mechanical Properties ◽  
Microstructural Characterization ◽  
Microwave Assisted ◽  
The Matrix ◽  
Rapid Sintering ◽  
Sic Particulates ◽  
Sic Reinforcement ◽  
Nano Size

Magnesium composites containing nano-size silicon carbide (SiC) particulates were synthesized using powder metallurgy technique coupled with a novel microwave assisted rapid sintering. The sintered specimens were hot extruded and characterized in terms of microstructural, physical and mechanical properties. Microstructural characterization revealed minimal porosity and the presence of a continuous network of nano-size SiC particulates decorating the particle boundaries of the metal matrix. Thermal mechanical analysis revealed a marginal reduction in the average coefficient of thermal expansion (CTE) values of the matrix with the addition of nano-size SiC reinforcement. Mechanical characterization revealed that the addition of nano-size SiC particulates lead to an increase in microhardness, 0.2% yield strength (YS), ultimate tensile strength (UTS) and ductility of the matrix. Particular emphasis was placed to correlate the effects of nano-size SiC reinforcement on the microstructural, physical and mechanical properties of monolithic magnesium.

An investigation into the effect of ball milling of reinforcement on the enhanced mechanical response of magnesium

2011 ◽  
Vol 45 (24) ◽  
pp. 2483-2493 ◽  
Author(s):  
Meisam Kouhi Habibi ◽  
Khin Sandar Tun ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Mechanical Response ◽  
Failure Strain ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Microwave Assisted ◽  
The Matrix ◽  
Rapid Sintering ◽  
Powder Metallurgy Route ◽  
Magnesium Composites

Magnesium composites containing as-received and ball-milled (B) Al particles were synthesized through powder metallurgy route using microwave-assisted rapid sintering technique followed by hot extrusion. Microstructural characterization revealed fairly uniform distribution of both as-received and ball-milled (up to 1.626 vol.%) Al particles in the matrix and reduction in average matrix grain size. Compared to monolithic Mg, Mg/Al, and Mg/Al (B) composites exhibited significantly higher strengths and failure strains. The results revealed that strength and failure strain (up to 1.626 vol.% Al) of composites containing ball-milled Al particles remained higher compared to composites containing as-received Al particles. Compared to monolithic Mg, Mg/1.626Al (B) composite exhibited the best mechanical properties improvement with an increase of 78%, 79%, 87%, and 225%, in 0.2%YS, UTS, failure strain and WOF, respectively, while for Mg/1.626Al composite, the improvement was 51%, 53%, 65% and 142%, respectively. The effects of as-received and ball-milled Al particles contribution on the enhancement of mechanical properties of Mg is investigated in this article.

Effect of the Matrix and Reinforcement Sizes on the Microstructure, the Physical and Mechanical Properties of Al-SiC Composites

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
M. A. Salem ◽  
I. G. El-Batanony ◽  
M. Ghanem ◽  
Mohamed Ibrahim Abd ElAal
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Volume Fraction ◽  
Physical And Mechanical Properties ◽  
Particle Sizes ◽  
Matrix Composites ◽  
Volume Fractions ◽  
The Matrix ◽  
Sic Composites ◽  
Sic Particle

Different Al-SiC metal matrix composites (MMCs) with a different matrix, reinforcement sizes, and volume fractions were fabricated using ball milling (BM) and powder metallurgy (PM) techniques. Al and Al-SiC composites with different volume fractions were milled for 120 h. Then, the Al and Al-SiC composites were pressed under 125 MPa and finally sintered at 450 °C. Moreover, microsize and combination between micro and nano sizes Al-SiC samples were prepared by the same way. The effect of the Al matrix, SiC reinforcement sizes and the SiC volume fraction on the microstructure evolution, physical and mechanical properties of the produced composites was investigated. The BM and powder metallurgy techniques followed by sintering produce fully dense Al-SiC composite samples with different matrix and reinforcement sizes. The SiC particle size was observed to have a higher effect on the thermal conductivity, electrical resistivity, and microhardness of the produced composites than that of the SiC volume fraction. The decreasing of the Al and SiC particle sizes and increasing of the SiC volume fraction deteriorate the physical properties. On the other hand, the microhardness was enhanced with the decreasing of the Al, SiC particle sizes and the increasing of the SiC volume fraction.

Characterization of Mg/MgO Nanocomposites Synthesized Using Powder Metallurgy Technique

Materials ◽  
2005 ◽  
Author(s):  
C. S. Goh ◽  
J. Wei ◽  
M. Gupta
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Volume Fraction ◽  
Physical And Mechanical Properties ◽  
Thermomechanical Analysis ◽  
Powder Metallurgy Technique ◽  
Magnesium Matrix ◽  
Individual Particles ◽  
Threshold Amount

Magnesium nanocomposites with 0.1, 0.2, 0.3 and 0.4 volume percentages of MgO were synthesized using the powder metallurgy technique. The nanocomposite billets obtained were subsequently hot extruded at a temperature of 350 °C with an extrusion ratio of 20.25:1. The extruded nanocomposites were characterized for their microstructural, physical and mechanical properties. The microstructures of the nanocomposites showed individual particles of MgO uniformly distributed in the magnesium matrix. The thermomechanical analysis results revealed that a more thermally stable magnesium nanocomposite could be obtained with a threshold amount of MgO. The tensile properties results indicated that the yield strength peaks at 0.3 vol.% of reinforcement incorporated, with an improvement of approximately 17%. An attempt is made to correlate the volume fraction of the MgO with the resultant physical and mechanical properties of the magnesium nanocomposites.

scholarly journals Enhancing Microstructure and Mechanical Properties of AZ31-MWCNT Nanocomposites through Mechanical Alloying

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
J. Jayakumar ◽  
B. K. Raghunath ◽  
T. H. Rao
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Matrix Material ◽  
Multiwall Carbon Nanotubes ◽  
High Energy ◽  
Powder Metallurgy Technique ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Microstructure Density

Multiwall carbon nanotubes (MWCNTs) reinforced Mg alloy AZ31 nanocomposites were fabricated by mechanical alloying and powder metallurgy technique. The reinforcement material MWCNTs were blended in three weight fractions (0.33%, 0.66%, and 1%) with the matrix material AZ31 (Al-3%, zinc-1% rest Mg) and blended through mechanical alloying using a high energy planetary ball mill. Specimens of monolithic AZ31 and AZ31-MWCNT composites were fabricated through powder metallurgy technique. The microstructure, density, hardness, porosity, ductility, and tensile properties of monolithic AZ31 and AZ31-MWCNT nano composites were characterized and compared. The characterization reveals significant reduction in CNT (carbon nanoTube) agglomeration and enhancement in microstructure and mechanical properties due to mechanical alloying through ball milling.

The Influence of Carbon Addition on the Physical and Mechanical Properties of WC-Co Sintered Powders

2012 ◽  
Vol 59 (2) ◽  
Author(s):  
Ahmad Aswad Mahaidin ◽  
Mohd Asri Selamat ◽  
Samsiah Abdul Manaf ◽  
Talib Ria Jaafar
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Powder Metallurgy ◽  
Grain Growth ◽  
Rupture Strength ◽  
Physical And Mechanical Properties ◽  
Cobalt Content ◽  
Powder Metallurgy Technique ◽  
Densification Process ◽  
Carbon Addition

The mechanical properties of WC-Co are highly dependent on its cobalt content, density and grain size of the WC particles. Addition of free carbon during the consolidation of process is said to improve the densification process and inhibit grain growth. However, there are still plenty of works needs to be done regarding this matter to support the fact. Therefore, this study is to evaluate the effect of carbon addition on the physical and mechanical properties of WC-Co-C sintered powders. The WC-Co-C sample is fabricated using powder metallurgy technique, in which the powders were uniaxially pressed at 625 MPa and cold-isostatic pressed at 200 MPa. Then, the sample is sintered in nitrogen-based atmosphere at temperature range of 1350-1450C. The physical and mechanical properties of the WC-Co sintered powders were analysed. It is found that WC-Co-C has a relatively higher density and hardness but exhibit lower transverse rupture strength compared to WC-Co.

Effect of Fabrication Techniques on the Properties of Carbon Nanotubes Reinforced Magnesium

2006 ◽  
Vol 111 ◽  
pp. 179-182 ◽  
Author(s):  
C.S. Goh ◽  
Jun Wei ◽  
L.C. Lee ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Powder Metallurgy ◽  
Physical And Mechanical Properties ◽  
Strengthening Effect ◽  
Powder Metallurgy Technique ◽  
Reinforcement Effect ◽  
Similar Weight ◽  
Hybrid Reinforcement

In this study, both liquid and powder metallurgy techniques were employed to fabricate Mg nanocomposites. Comparisons were made on the physical and mechanical properties of Mg nanocomposites using these two different fabrication techniques. When similar weight fractions of carbon nanotubes (CNTs) were added to Mg using these two different techniques, the nanocomposites fabricated using powder metallurgy technique were found to be thermally more stable and has higher yield and tensile strengths than those produced using liquid metallurgy technique. The higher yield and tensile strengths were due to the presence of MgO particles which were pre-existent in the Mg powders. The MgO particles cause a hybrid reinforcement effect in the Mg-CNT nanocomposites, which surpasses the strengthening effect of the CNTs alone.

Effect of Hybrid Length Scales (Micro + Nano) of SiC Reinforcement on the Properties of Magnesium

2006 ◽  
Vol 111 ◽  
pp. 91-94 ◽  
Author(s):  
W.L.Eugene Wong ◽  
Manoj Gupta
Keyword(s):  
Coefficient Of Thermal Expansion ◽  
Physical And Mechanical Properties ◽  
Microstructural Characterization ◽  
Mechanical Analysis ◽  
Pure Magnesium ◽  
Length Scales ◽  
The Matrix ◽  
Rapid Sintering ◽  
Thermal Mechanical Analysis ◽  
Sic Reinforcement

In this study, pure magnesium reinforced with micron, nano and micron + nano-size SiC particulates was synthesized using powder metallurgy technique coupled with a novel microwave assisted rapid sintering. The sintered billets were subsequently extruded and characterization studies were performed on the extruded specimens to assess the microstructural, physical and mechanical properties of the composites. Microstructural characterization revealed good interfacial integrity between the matrix and reinforcements. Results of thermal mechanical analysis indicate most significant decrease in the coefficient of thermal expansion of the magnesium matrix with the use of hybrid reinforcements. Mechanical characterization revealed that composite samples exhibited an increase in microhardness of the matrix and strength over that of pure magnesium while ductility was adversely affected. An attempt is made to correlate the effect of single length scale and mixed length scales of SiC reinforcement on the properties exhibited by pure magnesium.

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