Microstructure and mechanical properties of Al-7075/B4C composites fabricated by plasma activated sintering

Shen, Qiang; Wu, Chaohua; Luo, Guoqiang; Fang, Pan; Li, Chenzhang; Wang, Yiyu; Zhang, Lianmeng

doi:10.1016/j.jallcom.2013.11.089

Cited by 82 publications

(32 citation statements)

References 24 publications

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“…Further similar works were addressed by K.M. Shorewardi et al [6], with SiC, Al2O3, B4C (0-20 %), Sener Karabulut et al [7], AA7039/ Al2O3MMCs used powder technology and milling parameters were analysed. Most of the researchers used stir casting process and successfully obtained good results.…”

Section: Introductionmentioning

confidence: 79%

Comparative Investigations on Al7075 MMC reinforced with wt. %6 Al2O3 and B4C

Venkatesh

Basavaraj

Venkataramana

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Investigations on mechanical behavior of Al7075 -nano B4C composites T H Manjunatha, Dr. Yadavalli Basavaraj, Madeva Nagaral et al. Abstract. MMCs are finding greater applications in aerospace, auto industries owing to their typical properties with respect to wear, mechanical and temperature resistance. The present study involves evaluation of microstructure, drilling, mechanical properties for Al7075 reinforced with Al2O3 content of wt.% 6.MMC and compare with Al7075 -6% B4C composite for showing effect of reinforcement on drilling, mechanical properties. The composite samples were examined for mechanical, bending strength, hardness, elongation behaviour. Results revealed that uniform circulation of particulates in matrix structure with great bonding. Al7075 reinforced with 6% B4Cdisplays high mechanical strength, better elongation, high surface quality and low hardness is seen. Surface roughness test was carried on the basis of Taguchi's L9 orthogonal, and analysed by ANOVA, results specify maximum influence on surface roughness is due to speed for Al2O3. Further with B4C the surface roughness is affected by material, confirmation tests were also conducted for validation of process parameters.

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Section: Introductionmentioning

confidence: 79%

Comparative Investigations on Al7075 MMC reinforced with wt. %6 Al2O3 and B4C

Venkatesh

Basavaraj

Venkataramana

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Alaşım ve kompozit numunelerin mikroyapı görüntülerde çatlak oluşumuna rastlanmazken gözenek ve topaklanmalar tespit edilmiştir (Şekil 5). Kompozitlerde tespit edilen bu gözenek ve topaklanmalar mekanik özellikleri zayıflatmaktadır [7,[21][22][23]. Kompozit numuneye ait SEM imajı ve çizgisel EDX analizi Şekil 6'da verilmiştir.…”

Section: şEkilunclassified

“…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]. Matris yapıya ilave edilen partikül miktarı kritik sınır üzerine çıktığında ise takviye elemanlarında meydana gelen topaklanmalar kompozitin sertliğinin düşmesine neden olmaktadır [7]. Şekil 8'de görüldüğü gibi %5 ve %10'luk partikül ilavesi kompozitin sertliğinde kayda değer bir artış meydana getirirken, %15 ve %20 partikül ilaveli kompozitlerde artış eğilimi aynı şekilde devam etmeyip yataya yakın bir seyir göstermiştir.…”

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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“…Due to these desirable properties, AMCs are widely applied as structural materials in many industries, such as automobiles, aerospace, as well as drill pipe material used in extra-deep oil drilling [3][4][5][6]. Among aluminum alloys, 7000-series aluminum alloys possess the highest strength-to-weight ratio, which makes them an attractive candidate for reinforcement by a second phase to further improve their properties [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Reinforced 7075 Al Matrix Composites: Powder Synthesis and Mechanical Properties

Sun

Zhang

Лиу

et al. 2017

Metals

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Abstract:Reduced graphene oxide (rGO) reinforced 7075 Al matrix composites were fabricated by electrostatic self-assembly and powder metallurgy. 7075 Al powders were surface modified by introducing a cetyl trimethyl ammonium bromide (CTAB) membrane on the surface, which was able to form a strong bonding with graphene oxide (GO) through electrostatic interaction. During the vacuum sintering process, CTAB was effectively removed and GO was thermally reduced into rGO. Morphologies of GO nanosheets, GO/7075 Al powders, microstructures, and tensile fractographs of the composites were observed. The effect of rGO content on mechanical properties of rGO/7075 Al composites was investigated. The results show that a good bonding between rGO and matrix is achieved. With the rGO content increasing, the hardness increases gradually, while the ultimate tensile strength and yield strength initially increase and later decrease. The improvement in strength of rGO/7075 Al composites was attributed to stress transfer and dislocation strengthening. With rGO content reaching 0.50 wt %, the excessive addition of rGO gave rise to a weakening in the enhancement of the tensile properties due to the increasing amounts of brittle Al 4 C 3 and cracks.

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Microstructure and mechanical properties of Al-7075/B4C composites fabricated by plasma activated sintering

Cited by 82 publications

References 24 publications

Comparative Investigations on Al7075 MMC reinforced with wt. %6 Al2O3 and B4C

Comparative Investigations on Al7075 MMC reinforced with wt. %6 Al2O3 and B4C

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

Reduced Graphene Oxide Reinforced 7075 Al Matrix Composites: Powder Synthesis and Mechanical Properties

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