scholarly journals Effect of Remelting Temperature and Soaking Time on Microstructure and Mechanical Properties of the Thixoformed Part of Nano-Sized SiCp/7075 Composite

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 709
Author(s):  
Jufu Jiang ◽  
Guanfei Xiao ◽  
Yingze Liu ◽  
Ying Wang ◽  
Xi Nie
Keyword(s):  
Mechanical Properties ◽  
Aluminum Matrix ◽  
Side Wall ◽  
Aluminum Matrix Composite ◽  
Transgranular Fracture ◽  
Composite Part ◽  
Soaking Time ◽  
Ultrasonic Assisted ◽  
Bottom Side ◽  
Side Walls

Semisolid billet of the 7075 aluminum matrix composite reinforced with nano-sized SiC particles was first fabricated by an ultrasonic-assisted semisolid stirring method and rheoforming technology. Then it was thixoformed into a cylinder part under different remelting temperatures and soak times. The effects of the remelting temperature and soaking time on the mechanical properties and microstructure of the thixoformed composite part were investigated. The results show that parts of good quality were thixoformed successfully. The microstructure of the top side wall of the thixoformed part consisted of near spheroidal grains. A large quantity of elongated grains occurred in the medium and bottom side walls and the bottom itself. With increasing remelting temperatures, the size of the solid grains of the thixoformed parts showed a trend of first to increase and afterwards to decrease. High density dislocations were found in the microstructure when the remelting temperatures were 590 °C and 600 °C. When the soaking time was 15 min, the severest deformation occurred in the thixoformed part. High mechanical properties of the thixoformed parts were achieved under conditions such as a remelting temperature between 590 °C and 600 °C and a soaking time between 10 min and 15 min. The fracture mode of the thixoformed part changed from transgranular fracture to intergranular fracture when the remelting temperature was elevated from 580 °C to 610 °C. After the thixoformed parts were treated by T6, the ultimate tensile strength (UTS) and elongation of the side wall were improved to 552 MPa and 7.9%, respectively. Dispersed MgZn2 precipitates created by T6 heat treatment led to an improvement of the mechanical properties.

Copper Effect on Mechanical Properties of Al-CNF Composite Material Elaborated by Liquid Metallurgy with Induction Melting

2018 ◽  
Vol 941 ◽  
pp. 2018-2023
Author(s):  
Paul Royes ◽  
Nicolas Masquelier ◽  
Thierry Breville ◽  
David Balloy
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Carbon Nanofibers ◽  
Aluminum Matrix ◽  
Casting Process ◽  
Stir Casting ◽  
Aluminum Matrix Composite ◽  
Strength Increase ◽  
Induction Melting ◽  
Coated Carbon

Aluminum-Carbon nanoFibers (CNF) composites produce by stir casting process present a yield strengths (YS) and an ultimate tensile strength (UTS) improved up to 33%. The hardening of the Al-CNF composite was considered as the sum of elementary contributions of effects: natural hardness of pure Al; grain size; dislocation density; elements in solid solution; CNF. In order to quantify CNF effect, calculation was performed to quantify the contribution to yield strength of each other’s mechanisms. This theoretical calculation was compared to experimental results and the real effect of CNF on yield strength increase was estimated between 10 and 16%. Figure SEQ Figure \* ARABIC 1: Graphical Abstract (copper dots on CNF / stir casting process / contributions to hardening) Keywords: Aluminum matrix composite; copper-coated carbon nanofibers; liquid metallurgy elaboration; mechanical properties; hardening effect

scholarly journals ULTRASONIC ASSISTED CASTING OF ALUMINUM MATRIX COMPOSITE

2013 ◽  
pp. 246-250
Author(s):  
RAHUL GUPTA ◽  
B.S.S. DANIEL ◽  
G.P. CHAUDHARI
Keyword(s):  
Carbon Black ◽  
Matrix Composite ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Aluminium Matrix Composite ◽  
Mechanical Stirring ◽  
Ultrasonic Assisted ◽  
And Control ◽  
Melting Experiments ◽  
Ultrasonic Stirring

In this study, we have investigated the effect of ultrasonic stirring in aluminium matrix composite (A359 + 20 vol % SiC ) with the reinforcement of 1 mole % of carbon black. Melting experiments were performed by employing four different conditions. These were – carbon black addition accompanied with mechanical stirring, carbon black addition accompanied with ultrasonic stirring, ultrasonic stirring but no carbon black addition and control specimen (without ultrasonic stirring and no carbon black addition). Hardness comparisons between the samples casted at different condition were made. Sample which was ultrasonically treated (UST) and carbon inoculated had higher hardness than a sample which was neither ultrasonically treated nor carbon black inoculated and the samples which was either ultrasonically treated or carbon inoculated. Microstructure study revealed that a sample which was ultrasonically treated had fine dendrite structure and more uniform distribution of SiC particles than the other samples. Porosity was observed with those samples which were not ultrasonically treated. Al4SiC4 particles were observed but Al4C3 particles weren’t observed.

scholarly journals Study on Properties of Multi Walled Carbon Nanotube Reinforced Aluminum Matrix Composite through Casting Technique

2021 ◽  
Vol 18 (1) ◽  
pp. 97-101
Author(s):  
Shuib Pasha S A ◽  
Nayeem Ahmed M ◽  
Tilak S R ◽  
Anil Kumar B N
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Matrix Composite ◽  
Research Work ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Optical Microscope ◽  
Aluminum Matrix Composite ◽  
Casting Technique ◽  
Multi Walled Carbon Nanotubes

Composite materials are defined as material systems consisting of mixture of or combination of two or more micro constituents insoluble in each other and differing in form and or material composition. In this study Metal Matrix Composite (MMCs) has been produced using stir casting method for performing the mechanical properties. Most of the engineering industries want light and better mechanical properties of components; this can be achieved by MMCs of Aluminium because of its excellent performance. In this research work we fabricate the Aluminium by liquid route. Here Al 7075 is used as a base metal and Multi Walled Carbon Nanotubes (MWCNT) used as sub metal with various percentages. Experiments were conducted to analyze microstructure, hardness & tensile strength. By using optical microscope and Scanning Electron Microscope (SEM) we analyze the sample specimens are well dispersion in MWCNT with AA 7075. Hardness and tensile strength increases with increasing of wt. %. Hardness of material increases with increase in percentages of MWCNT, whereas tensile strength of the material increases with increase in percentages of MWCNT and Elongation reduces

scholarly journals ADDITION OF MAGNESIUM (Mg) WITH ALUMINA (AL2O3) REINFORCER IN ALUMINUM MATERIAL COMPOSITES ON THE MECHANICAL PROPERTIES AND MICRO STRUCTURES

2021 ◽  
Vol 2 (2) ◽  
pp. 7-13
Author(s):  
Basuki Widodo ◽  
Agung Panji Sasmito
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Matrix Composite ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Casting Process ◽  
Magnesium Content ◽  
Aluminum Matrix Composite ◽  
Aluminum Matrix Composites ◽  
Low Density

Aluminum is a widely used and applied material in daily life or in the industrial and automotive world. In order to improve the performance and properties of the application to be used, it needed an alloying element to improve the mechanical properties of the aluminum. Aluminum Matrix Composite (AMC) or better known as aluminum matrix composite is one type of material that has great potential to be developed, due to its good combination and properties such as high strength and hardness, low density, low density, capable of good machining, and its basic ingredients are easily found on the market and cheaper than other materials. This research was conducted using the stir casting process to be able to mix all the compositions contained in aluminum matrix composites and to help the distribution of alumina reinforcing particles (Al2O3) and aluminum matrices be evenly distributed. The parameters used in this casting process are varying the volume fraction of the Al2O3 amplifier by 0.5%; 1.5% and 2.5% plus the magnesium content remains 0.9%. The results showed that the addition of Al2O3 can increase the value of hardness and reduce the value of tensile strength. The highest hardness value was 75.3 HRB at the addition of Al2O3 by 2.5% and the lowest tensile strength value was 7.17 Kgf / mm2 with the percentage of Al2O3 addition of 0.5%.

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