scholarly journals Study of Mechanical Properties of Heat treated AL 7075/Graphite Powder/Baggasse Ash hybrid MMCs

2020 ◽  
pp. 203-211
Author(s):  
Meghashree K A ◽  
Puneeth P ◽  
Madhu M G ◽  
H K Shivananda
Keyword(s):  
Mechanical Properties ◽  
Compression Strength ◽  
Research Work ◽  
Testing Machine ◽  
Graphite Powder ◽  
Compression Tests ◽  
Standard Size ◽  
Casting Technique ◽  
Heat Treated ◽  
Al 7075

This research work investigated the influence of the graphite powder on the Mechanical behaviour of Aluminium 7075/Graphite Powder(Gr)/Bagasse Ash(BA) hybrid composite. This investigation reveals the effectiveness of incorporation of graphite powder in the composite for gaining enhancing mechanical properties. The Al7075 (Aluminium alloy 7075) reinforced with bagasse ash and graphite powder to form MMCs were investigated. The conventional liquid casting technique was used for the fabrication of the composite material and subject to T6 heat treatment. The composite was produced for different percentages of graphite powder and bagasse ash. The specimens were prepared as per ASTM standard size by turning and facing operations to conduct tensile tests, compression tests and hardness tests. The specimens for tensile and compression strength are tested using universal testing machine and for hardness they are tested using Brinell hardness testing machine. The reinforcement content was chosen as 2,4, 6wt.% of Graphite powder to identify its potential for self lubricating property under dry sliding conditions. Through the results, it is concluded that the MMC obtained has got better tensile strength, compression strength, yield strength and hardness properties when compared to non-heat-treated Al 7075 alone.

scholarly journals Investigations on Mechanical Properties of Heat-treated Aluminum 7075/Graphite Powder/Bagasse ash Hybrid Metal Matrix Composites

2019 ◽  
pp. 258-266
Author(s):  
Madhu M G ◽  
H K Shivanand ◽  
Prof Maibusab ◽  
Kiran R
Keyword(s):  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Compression Strength ◽  
Metal Matrix ◽  
Testing Machine ◽  
Graphite Powder ◽  
Matrix Composites ◽  
Astm Standard ◽  
Heat Treated ◽  
Al 7075

Metal Matrix Composites (MMC’s) consist of either pure metal or an alloy as the matrix material, while the reinforcement generally a ceramic material. Aluminium composites are considered as one of the advanced engineering materials which have attracted more and more benefits. Now a days these materials are widely used in space shuttle, commercial airlines, electronic substrates, bicycles, automobiles, etc., Among the MMC’s aluminium composites are predominant in use due to their low weight and high strength. The key features of MMC’s are specific strength and stiffness, excellent wear resistance, high electrical and thermal conductivity. Hence, it is proposed to form a new class of composite. Al 7075 alloy reinforced with Graphite Powder and Bagasse ash to form MMC using Stir casting. The MMC is obtained for different composition of Graphite powder and Bagasse ash particulates (varying Graphite powder with constant Bagasse ash and varying Bagasse ash with constant Graphite powder percentage). The test specimens are prepared as per ASTM standard size by turning and facing operations to conduct tensile tests, compression tests and hardness tests. The specimens are tested for tensile strength and compression strength as per ASTM standard E8 by using universal testing machine and hardness as per ASTM standard E10 at different loads by using Brinell hardness testing machine. Through the results, it is concluded that the MMC obtained has got better tensile strength, compression strength and hardness properties when compared to non-heat-treated Al 7075 alone.

scholarly journals Influence of Al and Ti Additions on Microstructure and Mechanical Properties of Leaded Brass Alloys

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Rajab Mohammed Hussein ◽  
Osama Ibrahim Abd
Keyword(s):  
Mechanical Properties ◽  
Compression Strength ◽  
Testing Machine ◽  
Optical Emission ◽  
Optical Microscope ◽  
Mechanical Tests ◽  
Compression Tests ◽  
Wear Properties ◽  
Microstructure And Mechanical Properties ◽  
Brass Alloys

Brass has an attractive combination of properties, namely, good corrosion resistance, good wear properties, and high thermal and electrical conductivity. In this study, influence of selected alloy additions (Al and Ti) on performance of leaded brass alloys (CuZn39pb3) was investigated. The observation of microstructures, compression tests, and hardness tests were performed. The results of metallographic and mechanical tests indicate some influence of small amount additives of Al and Ti. Optical emission spectrometer (OES), light optical microscope (LOM), micro-Vickers hardness tester, and compression testing machine were used in this investigation. Consequently, Al had a significant effect on microstructure and mechanical properties of CuZn39Pb3 alloy. A larger compression strength at 0.31% wt of Al was obtained, as compared with the other alloys. Adding of Al and Ti led to the modification of the microstructure; thus, the compression strength was increased.

scholarly journals Formation conditions and mechanical properties of aggregates produced in tephra–water–snow flows

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Hirofumi Niiya ◽  
Kenichi Oda ◽  
Daisuke Tsuji ◽  
Hiroaki Katsuragi
Keyword(s):  
Mechanical Properties ◽  
Mixing Time ◽  
Testing Machine ◽  
Small Scale ◽  
Scaling Analysis ◽  
Compression Tests ◽  
Ice Slurry ◽  
Experimental Conditions ◽  
Formation Conditions ◽  
Snow And Ice

Abstract The formation of aggregates consisting of snow, water, and tephra has been reported in small-scale experiments on three-phase flows containing tephra, water, and snow, representing lahars triggered by snowmelt. Such aggregates reduce the mobility of mud flow. However, the formation mechanism of such aggregates under various conditions has not been investigated. To elucidate the formation conditions and mechanical properties of the aggregates, we performed mixing experiments with materials on a rotating table and compression tests on the resulting aggregates with a universal testing machine in a low-temperature room at $$0\,^{\circ }\text {C}$$ 0 ∘ C . From experiments with varying component ratios of the mixture and tephra diameter, the following results were obtained: (i) the aggregate grew rapidly and reached maturity after a mixing time of 5 min; (ii) the mass of aggregates increased with snow concentration, exhibiting an approximately linear relationship; (iii) single aggregates with large mass formed at lower and higher tephra concentrations, whereas multiple aggregates with smaller mass were observed at intermediate concentrations; (iv) the shape of the aggregate satisfied the similarity law for an ellipsoid; (v) the compressive mechanical behavior could be modeled by an empirical nonlinear model. The obtained mechanical properties of the aggregates were independent of the experimental conditions; (vi) scaling analysis based on the Reynolds number and the strength of the aggregates showed that the aggregates cannot form in ice-slurry lahars. Our findings suggest that low-speed lahars containing snow and ice are likely to generate aggregates, but snow and ice in the ice-slurry lahars are dispersed without such aggregates.

scholarly journals Microstructure and Mechanical Properties of Hypo- and Hypereutectic Cast Mg/Mg2Si Composites

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3591
Author(s):  
Katarzyna N. Braszczyńska-Malik ◽  
Marcin A. Malik
Keyword(s):  
Mechanical Properties ◽  
Compression Strength ◽  
Eutectic Mixture ◽  
Weight Fraction ◽  
Uniaxial Tensile ◽  
Compression Tests ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Mg2si Phase ◽  
Microstructure And Mechanical Properties

In this paper, the microstructure and mechanical properties of two magnesium matrix composites—a hypoeutectic with 1.9 wt% Mg2Si phase and a hypereutectic with 19 wt% Mg2Si compound—were analyzed. The investigated materials were prepared using the gravity casting method. Microstructure analyses of the fabricated composites were carried out by XRD and light microscopy. The tensile and compression strength as well as yield strength of the composites were examined in both uniaxial tensile and compression tests. The microstructure of the hypoeutectic composite was in agreement with the phase diagram and composed of primary Mg dendrites and an Mg–Mg2Si eutectic mixture. For the hypereutectic composite, besides the primary Mg2Si phase and eutectic mixture, additional magnesium dendrites surrounding the Mg2Si compound were observed due to nonequilibrium solidification conditions. The composites exhibited a rise in the examined mechanical properties with an increase in the Mg2Si weight fraction and also a higher tensile and compression strength in comparison to the pure magnesium matrix (cast in the same conditions). Additionally, analyses of fracture surfaces of the composites carried out using scanning electron microscopy (SEM + EDX) are presented.

EXPERIMENTAL INVESTIGATIONS ON THE INFLUENCE OF TiC/GRAPHITE REINFORCEMENT IN WEAR BEHAVIOR OF Al 6061HYBRID COMPOSITES

2019 ◽  
Vol 26 (04) ◽  
pp. 1850173 ◽  
Author(s):  
S. JEYAPRAKASAM ◽  
R. VENKATACHALAM ◽  
C. VELMURUGAN
Keyword(s):  
Hybrid Composites ◽  
Wear Behavior ◽  
Research Work ◽  
Testing Machine ◽  
Wear Testing ◽  
Experimental Investigations ◽  
Sem Images ◽  
Weight Percentage ◽  
Casting Technique ◽  
Graphite Particles

This research work focuses about fabrication and investigation on the influence of Titanium Carbide (TiC)-graphite particles reinforcement in wear behavior of Aluminium Matrix Composites (AMC). The stir casting technique was used to fabricate AMC reinforced with various weight percentage of TiC and graphite particles. Wear tests were conducted by using pin-on-disc wear testing machine. The hardness of the hybrid composites were recorded on the test specimen. The worn out surfaces of composites were analyzed using Scanning Electron Microscope (SEM). Results reveal that the presence of TiC and graphite particles improved the wear resistance. The wear of composite is primarily due to delamination and abrasion. The graphite particles serve as the solid lubricant on the wear of composite. The hardness of composite is improved with the decrease in weight percentage of graphite. SEM images reveal that the reinforcement particles in the matrix are homogeneously distributed. Also, worn-out surfaces of the composite were studied to observe wear track and wear mechanisms like plowing grooves, crack or cutting, and fragmentation.

Effect of Sc on As-Cast Microstructures and Mechanical Properties of Al-Si-Mg-Cu-Ti Alloys

2017 ◽  
Vol 732 ◽  
pp. 32-37 ◽  
Author(s):  
Ming He Wang ◽  
Xiao Dong Du ◽  
Yu Kun Li ◽  
Zhen Zhang ◽  
Hai Lin Su ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Testing Machine ◽  
Ti Alloys ◽  
Universal Testing ◽  
Transmission Electron ◽  
Heat Treated ◽  
Eutectic Si ◽  
Microstructures And Mechanical Properties ◽  
Equiaxed Grain

The as-cast microstructures and mechanical properties of Al-Si-Mg-Cu-Ti alloys with and without Sc were investigated by metallographic microscope, field emission scanning electron microscope, energy spectrum analysis, transmission electron microscope and universal testing machine. The result shows that adding 0.20wt.% Sc into the casting alloy can refine the grain, change the growth morphology from dendrite to fine equiaxed grain, and the morphology of eutectic Si by rough laminar structure into fine fibrous. The tensile strength of alloy with 0.20wt.% Sc is up to 304.4 MPa after T6 heat treated, which is close to that of 6061 forging aluminum alloy.

The Effect of the Normalizing Rolling of S355J2G3 Steel Round Bars on the Selected Mechanical Properties of Finished Product

2010 ◽  
Vol 165 ◽  
pp. 294-299 ◽  
Author(s):  
Konrad Błażej Laber ◽  
Henryk Dyja
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Stress ◽  
Rolling Mill ◽  
Research Work ◽  
Testing Machine ◽  
Rolling Process ◽  
Constructional Steel ◽  
Steel Grade ◽  
Bar Rolling

The paper presents investigation results related to the effect of application of round plain bar normalizing rolling on the selected mechanical properties of finished product. The research was carried out for the process of rolling 38 mm-diameter plain round bars made of constructional steel S355J2G3, based on actual specifications used in industrial conditions in a continuous bar rolling mill. In the course of investigation the yield stress, YS, and the tensile strength, TS, were determined. With the aim of evaluating the effect of controlled (normalizing) rolling on the mechanical properties of the considered steel grade, Zwick Z/100 testing machine was employed and analytical relationships were used. On the basis of performed research work it was established that enhancement of mechanical properties of the considered steel can be obtained as a result of application of the normalizing rolling process.

Microstructure and Mechanical Properties of Rapidly Solidified Al-Fe-Ni-Mg Alloys

2011 ◽  
Vol 674 ◽  
pp. 165-170 ◽  
Author(s):  
Anna Kula ◽  
Ludwik Blaz ◽  
Makoto Sugamata
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Rapid Solidification ◽  
Spray Deposition ◽  
Research Work ◽  
Mg Alloys ◽  
Solid Solution Hardening ◽  
Compression Tests ◽  
Microstructure And Mechanical Properties ◽  
Wide Range

Rapid solidification (RS) combined with following mechanical consolidation of RS powders is considered as a valuable commercial method for the production of a wide range of metallic materials having fine-grained structures. Reported research results for various alloys demonstrate better compositional homogeneity, smaller grain size and relatively fine precipitates distributed homogenously in RS alloys than that for the materials produced by conventional metallurgical processing. The effect of rapid solidification on the microstructure and mechanical properties of selected Al-Fe-Ni-Mg alloys have been investigated. The basic item of the research work was obtaining aluminum PM materials strengthened by highly-dispersed transition metal compounds and aluminum-magnesium solid solution. Rapid solidification (RS) of Al-4Fe-4Ni and Al-4Fe-4Ni-5Mg alloys was performed by means of gas atomizing of the molten alloy and the spray deposition on the rotating water-cooled copper roll. Using typical powder metallurgy (PM) methods, i.e. cold pressing, vacuum degassing and hot extrusion, the RS-flakes were consolidated to the bulk PMmaterials. For comparison purposes, the conventionally cast and hot extruded Al-4Fe-4Ni and Al-4Fe-4Ni-5Mg alloys were studied as well. Mechanical properties of as-extruded materials were examined by compression tests performed at 293 K – 873 K. It was found that relatively high strength of as-extruded PM materials was accompanied by high ductility of samples deformed by hot compression test. Structural observations confirmed beneficial influence of rapid solidification on effective refining of intermetallic compounds, although some inhomogeneity of fine precipitates distribution was observed. Nevertheless, it was considered that an effective increase of the microhardness and strength of tested RS materials mostly result from achieved dispersion of structural components and can be intensified by solid solution hardening due to Mg-addition.

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 Research into the Production of Tungsten Heavy Alloys with Specific Mechanical Properties

2019 ◽  
Vol 10 (4) ◽  
pp. 23-36
Author(s):  
Paweł SKOCZYLAS ◽  
Zbigniew GULBINOWICZ ◽  
Olgierd GOROCH ◽  
Katarzyna BARCZ ◽  
Mieczysław KACZOROWSKI
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Testing Machine ◽  
Development Project ◽  
Liquid Phase Sintering ◽  
Heavy Alloys ◽  
Heat Treated ◽  
Critical Technology ◽  
Two Stages ◽  
New Generation

The subject of the work discussed herein and carried out as a part of the Polish National Centre of Research and Development project titled ”Development and implementation of critical technology demonstrators for the new generation of 120 mm tank artillery ammunition” are the results of a research into the influence of LPS (Liquid Phase Sintering) parameters and heat treatment on the mechanical properties of W91Ni6Co3 and W91Ni6Co2.25Fe0.75 alloys, designated PR200 and PR201, respectively. The alloys, as LPS-processed and heat treated, were tested on a strength testing machine to determine their tensile strength (Rm), proof stress (Rp0.2) and elongation (A5). The analysis of the test results resulted in a proposal of manufacturing process parameters to have the alloys tested develop specified mechanical properties. It was found the ternary alloy with chemical composition W91Ni6Co3 and designated PR200 was more promising in the feasibility of producing specified mechanical properties. The alloy, once sintered and heat treated in two stages, could facilitate production of a material with a tensile strength Rm>1400 MPa, a yield strength Rp0.2 > 1350 MPa, a minimum elongation of 11%, and an impact strength > 115 J/cm2.

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