Investigation of particle size and amount of alumina on microstructure and mechanical properties of Al matrix composite made by powder metallurgy

Rahimian, Mehdi; Parvin, Nader; Ehsani, N.

doi:10.1016/j.msea.2009.09.034

Cited by 249 publications

(90 citation statements)

References 22 publications

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“…A similar observation was made by M. Rahimian. 21 From Figure 6 it is observed that yield strength increases as the weight fraction of SiC increases. The yield strength of Al8011-6 % of mass fractions of SiC-63 μm (220 mesh) was observed to be 87 MPa which was 89 % higher than the unreinforced alloy.…”

Section: Resultsmentioning

confidence: 95%

“…The results reveal that the reinforcement of fine alumina particles exhibits a higher mechanical property than the intermediate and coarse particles. M. Rahimian et al 21 investigated the effect of particle size and weight fraction of alumina on the mechanical properties of aluminium matrix composite produced by powder metallurgy. Three different weight fractions (5, 10, 15) and three different particle sizes of alumina (3, 12, 48) μm were used as the reinforcement.…”

Section: Introductionmentioning

confidence: 99%

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Effect of particles size on the mechanical properties of SiC-reinforced aluminium 8011 composites

Ashok¹,

Palanisamy²

2017

Mater. Tehnol.

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The effects of the SiC particle size on the mechanical properties of aluminium 8011-SiC composites are reported. Three different particle sizes of SiC (63, 76, 89) μm with two different mass fractions of 2 % and 4 % reinforced with aluminium 8011 were processed using the stir-casting method. The mechanical properties, like hardness, tensile strength, yield strength, ductility, and toughness, of the composites and the unreinforced alloy were tested. It was observed that the hardness, tensile strength, yield strength, ductility, and toughness increase with a decrease in the particle size of the SiC. The increase in weight fraction of the SiC improves all the mechanical properties, except for the ductility and toughness of the composites. The results reveal that the fine 63 μm (220 mesh) SiC particles introduced superior mechanical properties compared to the intermediate 76 μm (180 mesh) SiC particles and the coarse 89 μm (150 mesh) SiC. Keywords: composites, particle size, stir casting method, weight fractions, mechanical properties Delo poro~a o u~inkih velikosti delcev SiC na mehanske lastnosti aluminijevih 8011 kompozitov. Tri razli~ne velikosti delcev SiC (63, 76, 89) μm z dvema razli~nima dele`ema te`e (2 in 4) %, oja~ane z aluminijem 8011, so bile obdelane z metodo me{anja in litja. Testirane so bile mehanske lastnosti, kot so: trdota, natezna trdnost, meja te~enja, duktilnost in`ilavost kompozitov in neoja~ane zlitine. Ugotovljeno je bilo, da se trdota, natezna trdnost, meja te~enja, duktilnost in`ilavost pove~ajo z zmanj{anjem velikosti delcev SiC. Pove~anje dele`a masnega odstotka SiC izbolj{uje vse mehanske lastnosti razen razteznosti in`ilavosti kompozitov. Rezultati ka`ejo, da drobni 63 μm (220 mesh) SiC delci poka`ejo nadpovpre~ne mehanske lastnosti v primerjavi z vmesnim 76 μm (180 mesh) SiC delci in grobimi 89 μm (150 mesh) SiC. Klju~ne besede: kompoziti, velikost delcev, metoda me{anja in litja, masni dele`i, mehanske lastnosti

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Effect of particles size on the mechanical properties of SiC-reinforced aluminium 8011 composites

Ashok¹,

Palanisamy²

2017

Mater. Tehnol.

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“…Her iki yaşlandırma işleminde de, matris yapıya ilave edilen partikül miktarının artışı, dağılım sertleşmesi mekanizması ile kompozitin sertlik değerlerinde artışa neden olmuştur. Kompozit malzemelerde artan sert faz içeriği kompozitin sertliğinde artış meydana getirdiği çeşitli çalışmalarda da rapor edilmiştir [13,[25][26][27][28][29][30]. Ancak, kompozitlerin sertliği yalnızca partikül içeriğine bağlı olmayıp, gözenek miktarı, şekli ve boyutu ile takviye elemanı boyutu, matristeki dağılımı ve topaklanması gibi birçok faktöre de bağlıdır [26].…”

Section: şEkil 7 T6 and T73 ıSıl Işlemli Numunelerin Sem Görüntüleriunclassified

Sıcak Ekstrüze Edilmiş AA7075-Sicp Kompozitlerin Tribolojik Karakteristiklerine Isıl İşlemin Etkisi

Matik¹,

Tanattı²

2017

Journal of Polytechnic

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Sıcak ekstrüze edilmiş AA7075-Sicp kompozitlerin tribolojik karakteristiklerine ısıl işlemin etkisi Effect of heat treatments on tribological characteristics of hot-extruded AA7075-Sicp composites Yazar(lar) (Author(s)): Ulaş MATİK, Kübra TANATTIBu makaleye şu şekilde atıfta bulunabilirsiniz (To cite to this article): Matik U. ve Tanattı K., "Sıcak ekstrüze edilmiş AA7075-sicp kompozitlerin tribolojik karakteristiklerine ısıl işlemin etkisi", Politeknik Dergisi, 20(4): 807-814, (2017). Politeknik Dergisi, 2017; 20 (4) : 807-814 Journal of Polytechnic, 2017; 20 (4) ÖZToz metal kompaktların sıcak ekstrüzyonu ile üretilen ve farklı oranlarda 32 µm boyutlu SiC partiküller ile takviye edilen AA7075 Al matrisli kompozitlerin mikroyapı, sertlik ve tribolojik performansına T6 ve T73 ısıl işlemlerinin etkisi incelendi. Bu amaçla, soğuk olarak preslenmiş farklı SiC partikül içeriğine sahip AA7075 toz metal kompaktlar 480 °C'de, 12 mm çaplı çubuklar halinde ekstrüze edildi. T6 ve T73 ısıl işlemlerinin uygulandığı ekstrüze edilmiş numunelerin mikroyapı, sertlik ve tribolojik karakteristikleri tarama elektron mikroskobu (SEM), enerji dağınımlı x-ray analizör (EDX), brinell sertlik ve adhesif aşınma test ve analizleri ile incelendi. Deneysel sonuçlar, SiC partikül içeriğinin artmasına bağlı olarak kompozitin sertlik ve aşınma direncinin de arttığını göstermektedir. Ayrıca, T6 ısıl işlemli numunelerin T73 ısıl işlemli numunelere göre daha iyi sertlik, sürtünme ve aşınma performansı gösterdiği tespit edildi.Anahtar Kelimeler: AA7075, kompozit, ekstrüzyon, aşınma, sertlik. Effect of Heat Treatments on Tribological Characteristics of Hot-Extruded AA7075-SiC p Composites ABSTRACTThe effect of T6 and T73 tempers on microstructure, hardness and tribological performance of hot-extruded reinforced with 32 µm sized SiC particles reinforced AA7075 Al matrix composites produced by hot-extrusion of powder metal compacts was investigated. For this purpose, the cold pressed AA7075 powder metal compacts with various SiC contents were extruded into 12 mm rod bars at 480 °C. The microstructure, hardness and tribological characteristics of T6 and T73 tempered samples were examined with scanning electron microscopy (SEM), energy dispersive x-ray analyzer (EDX), brinell hardness and adhesive wear tests. The results showed that the hardness and wear resistance of composites increases depending on the increase of SiC particle content. It was also determined that T6 tempered samples showed better hardness, friction and wear performance compared to T73 tempered samples.

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“…The reason for this phenomenon can be due to their higher specific surface of finer particles in comparison with coarse particulates. 3,16) An increase in the specific surface leads to higher interparticle friction and thus leading to decreased particle distribution and so weakening of grain junctions occurs. 3,16) Presence of reinforcement seems to be rather uniform inside the grain and boundaries.…”

Section: Microstructural Evolutionsmentioning

confidence: 99%

“…4) Increased dislocation density and microstrain and also grain size refinement due to the milling process which leads to work hardening of the milled materials can be considered as other reasons for that phenomenon. 4,16) For hardness enhancement, it could be assumed that reinforcements act as a barrier to the dislocation movement within the matrix and exhibit greater resistance to the indentation of the hardness tester. The reason for that is mainly due to the decreased inter-particle distance of nanoparticle reinforcements, which results in more effectiveness action of Orowan mechanism.…”

Section: Microstructural Evolutionsmentioning

confidence: 99%

Hardness and Wear Properties of Al–4.5%Cu/Al<sub>3</sub>Mg<sub>2</sub> Nanocomposite Prepared by Mechanical Alloying

et al. 2012

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AlMg alloys close to ¢-Al 3 Mg 2 intermetallic phase were processed by neutral gas coverage melting process of pure elemental Al and Mg with the composition of Al40 mass% Mg. Mechanical milling was applied in order to convert the pre-alloyed ingots to nanocrystalline or amorphous alloy. X-ray diffraction and transmission electron microscopy (TEM) tests were carried out to investigate the formation of Al 3 Mg 2 single phase nanoparticle. Having prepared the single phase intermetallic, it was added to the pre-alloyed matrix powder of Al4.5 mass% Cu, in different contents. The effect of the reinforcing agent on the microhardness and wear behavior of the nanocopmosites were studied thoroughly with the aid of press-sinter methodology and quantitative data recorders via pin-on-disk wear test. The results of microhardness tests revealed that the hardness of nanocomposites is significantly improved with increasing reinforcement content with in the matrix. The coexisted wear mechanisms, mainly delamination and abrasive, of the consolidated nanocopmosites were investigated through scanning electron microscopy (SEM) and TEM observations.

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Investigation of particle size and amount of alumina on microstructure and mechanical properties of Al matrix composite made by powder metallurgy

Cited by 249 publications

References 22 publications

Effect of particles size on the mechanical properties of SiC-reinforced aluminium 8011 composites

Effect of particles size on the mechanical properties of SiC-reinforced aluminium 8011 composites

Sıcak Ekstrüze Edilmiş AA7075-Sicp Kompozitlerin Tribolojik Karakteristiklerine Isıl İşlemin Etkisi

Hardness and Wear Properties of Al–4.5%Cu/Al<sub>3</sub>Mg<sub>2</sub> Nanocomposite Prepared by Mechanical Alloying

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Investigation of particle size and amount of alumina on microstructure and mechanical properties of Al matrix composite made by powder metallurgy

Cited by 249 publications

References 22 publications

Effect of particles size on the mechanical properties of SiC-reinforced aluminium 8011 composites

Effect of particles size on the mechanical properties of SiC-reinforced aluminium 8011 composites

Sıcak Ekstrüze Edilmiş AA7075-Sicp Kompozitlerin Tribolojik Karakteristiklerine Isıl İşlemin Etkisi

Hardness and Wear Properties of Al&ndash;4.5%Cu/Al<sub>3</sub>Mg<sub>2</sub> Nanocomposite Prepared by Mechanical Alloying

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Hardness and Wear Properties of Al–4.5%Cu/Al<sub>3</sub>Mg<sub>2</sub> Nanocomposite Prepared by Mechanical Alloying