Development of high-performance A356/nano-Al2O3 composites

Mazahery, Ali; Abdizadeh, Hossein; Baharvandi, Hamid Reza

doi:10.1016/j.msea.2009.04.014

Cited by 369 publications

(163 citation statements)

References 8 publications

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“…It was attributed to greater agglomeration of Al2O3 nanoparticles that occurred in the composite due to a large volume fraction of Al2O3 nanoparticles [37]. A similar phenomenon was found in the research of Mazahery et al [41] and Su et al [37]. Mechanical properties in the present study were higher than those of Su et al [37].…”

Section: Influence Of Volume Fraction Of Al2o3 Nanoparticles On Mechasupporting

confidence: 87%

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Jiang

Xiao

Che

et al. 2018

Metals

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Abstract:The 2024 nanocomposite reinforced with Al 2 O 3 nanoparticles was fabricated by the ultrasonic assisted semisolid stirring (UASS) method and rheoformed into a cylinder component. Microstructure, mechanical properties, and wear behavior of the rheoformed composite components were investigated. The results showed that the composite components with complete filling status and a good surface were rheoformed successfully. The deformation of semisolid slurries was mainly dominated by flow of liquid incorporating solid grains (FLS), sliding between solid grains (SSG), and plastic deformation of solid grains (PDS). Mechanical properties of the rheoformed composite components were influenced by stirring temperature, stirring time, and volume fraction of Al 2 O 3 nanoparticles. The optimal ultimate tensile strength (UTS) of 358 MPa and YS of 245 MPa were obtained at the bottom of the rheoformed composite components after a 25-min stirring of composite semisolid slurry with 5% Al 2 O 3 nanoparticles at 620 • C. Enhancement of mechanical properties was attributed to high density dislocations and dislocation tangles and uniform dispersed Al 2 O 3 nanoparticles in the aluminum matrix. Natural ageing led to the occurrence of needle-like Al 2 CuMg phase and short-rod-like Al 2 Cu phase. UTS of 417 MPa and YS of 328 MPa of the rheoformed composite components were achieved after T6 heat treatment. Improvement of mechanical properties is due to the more precipitated needle-like Al 2 CuMg phase and short-rod-like Al 2 Cu phase. Wear resistance of the rheoformed composite components was higher than that of the rheoformed matrix component. Wear resistance of the rheoformed composite component increased with an increase in Al 2 O 3 nanoparticles from 1% to 7%. A slight decrease in wear rate resulted from 10% Al 2 O 3 nanoparticles due to greater agglomeration of Al 2 O 3 nanoparticles. A combination mechanism of adhesion and delamination was determined according to worn surface morphology.

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Section: Influence Of Volume Fraction Of Al2o3 Nanoparticles On Mechasupporting

confidence: 87%

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Jiang

Xiao

Che

et al. 2018

Metals

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“…Compared with traditional micron-sized SiC p /Al composites, the higher tensile strength and good ductility of the nano-sized SiC p /Al composites entitle them to have more competitive ability for advanced structural applications such as in automotive and aerospace industries and the military [10]. In the past decades, several processing techniques have been developed for fabricating Al matrix composites reinforced with nano-sized particles such as high-energy milling, powder metallurgy, and nano-sintering, and liquid-state solidification processing (e.g., stir casting) [11][12][13][14][15][16][17][18][19]. In these techniques, the semisolid stirring process has some important advantages such as low cost, capability of producing products with complex shapes, and processing simplicity [14].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Tensile Properties of Al–Cu Matrix Composites Reinforced with Nano-Sized SiCp Fabricated by Semisolid Stirring Process

Qiu

Gao

Tang

et al. 2017

Metals

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Abstract:The nano-sized SiC p /Al-Cu composites were successfully fabricated by combining semisolid stirring with ball milling technology. Microstructures were examined by an olympus optical microscope (OM), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). Tensile properties were studied at room temperature. The results show that the α-Al dendrites of the composites were strongly refined, especially in the composite with 3 wt. % nano-sized SiC p , of which the morphology of the α-Al changes from 200 µm dendritic crystal to 90 µm much finer equiaxial grain. The strength and ductility of the composites are improved synchronously with the addition of nano-sized SiC p particles. The as-cast 3 wt. % nano-sized SiC p /Al-Cu composite displays the best tensile properties, i.e., the yield strength, ultimate tensile strength (UTS) and fracture strain increase from 175 MPa, 310 MPa and 4.1% of the as-cast Al-Cu alloy to 220 MPa, 410 MPa and 6.3%, respectively. The significant improvement in the tensile properties of the composites is mainly due to the refinement of the α-Al dendrites, nano-sized SiC p strengthening, and good interface combination between the SiC p and Al-Cu alloys.

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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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Development of high-performance A356/nano-Al2O3 composites

Cited by 369 publications

References 8 publications

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Microstructures and Tensile Properties of Al–Cu Matrix Composites Reinforced with Nano-Sized SiCp Fabricated by Semisolid Stirring Process

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

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