Effect of graphite and transition elements (Cu, Ni) on high temperature tensile behaviour of Al–Si Alloys

Rajaram, Gukan; Kumaran, S.; Rao, T. Srinivasa

doi:10.1016/j.matchemphys.2011.02.069

Cited by 35 publications

(8 citation statements)

References 20 publications

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“…This reveals a formation of polymer components in protective films of secondary structures. The areas in the polymer component of secondary structures (spectra 9,17,18,19,22,23,30) where the carbon content exceeds the concentration of oxygen, were not found.…”

Section: Study Of the Secondary Structures On The Worn Surface Of The...mentioning

confidence: 93%

“…These phases, usually (except for spectrum 19), are poorly carburized but contain a significant amount of oxygen. The thinner is the precipitation of soft phases, the higher the content of Al in the spectrum.…”

Section: Study Of the Secondary Structures On The Worn Surface Of The...mentioning

confidence: 99%

“…Low melting zinc phases show chemical activity that contributes to the formation of protective secondary structures on the rubbing surface, and increases the running-in ability and wear resistance [16,17]. Nickel is added to aluminum-copper and aluminum-silicon alloys to improve hardness and strength at elevated temperatures and to reduce the coefficient of thermal expansion [18,19]. Tin [20][21][22][23] and lead [24][25][26][27] are present as soft structural components in these alloys that act as solid lubricants.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the Mechanical and Tribological Properties of Aluminum-Based Alloys Fabricated by SPS and Alloyed with Mo and Cr

Grigoriev

Миронов

Kuznetsova

et al. 2021

Metals

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Multicomponent aluminum-based alloys doped with chromium (Cr) and molybdenum (Mo), fabricated by spark plasma sintering (SPS), derived from a powder mixture prepared by mechanical alloying, were studied in this work. The morphology of the pristine and worn surfaces was analyzed using a scanning electron microscope equipped with an energy-dispersive X-ray spectroscopy system. The obtained alloys exhibited higher hardness (73 and 72) for the Al–Mo and Al–Cr alloys, respectively, compared to reference bronze. Besides improved hardness, SPS-sintered alloys also showed a lower value of the weight and linear wear and the highest score-resistance compared to bronze. The enhanced tribological behavior is related to the formation of secondary structures on the friction surfaces of rubbing pairs, which in turn reduce wear. For the first time, the present research has demonstrated the effectiveness of the addition of Mo and Cr for the fabrication of sintered multicomponent Al-based alloys with a tailored microstructure that induces the formation of secondary structures on the tribosurfaces due to the self-organization processes during friction.

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Section: Study Of the Secondary Structures On The Worn Surface Of The...mentioning

confidence: 93%

Section: Study Of the Secondary Structures On The Worn Surface Of The...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancement of the Mechanical and Tribological Properties of Aluminum-Based Alloys Fabricated by SPS and Alloyed with Mo and Cr

Grigoriev

Миронов

Kuznetsova

et al. 2021

Metals

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“…As a summary, the last three terms of Equation 8, i.e., three strengthening effects, are greatly improved in high-temperature section. However due to the soft nature of aluminum matrix in high-temperature section [41], YS will decrease partially; the strengthening of YS mentioned above is offset by softening of aluminum matrix, therefore, YS of the alloy presents completely stability in high-temperature section.…”

Section: Mechanism Analysismentioning

confidence: 99%

Mechanical Performances of Al-Si-Mg Alloy with Dilute Sc and Sr Elements

et al. 2020

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Due to its excellent comprehensive performances, Al-Si-Mg alloy i widely used in automotive, transportation and other fields. In this work, tensile performances and fracture behavior of Al-Si-Mg alloy modified by dilute Sc and Sr elements (Al-7.12Si-0.36Mg-0.2Sc-0.005Sr) were investigated at the temperature of −60–200 °C for the first time, aiming to obtain a satisfactory thermal stability within a certain temperature range. The results showed that the new designed Al-Si-Mg alloy possessed a completely stable yield strength and a higher-level elongation under the present conditions. Fracture morphology analysis, fracture profile observation and strengthening mechanism analysis were applied to elucidate the evolution mechanisms of yield strength and elongation of the alloy. The fracture modes were significantly distinct in different temperature sections, and the reasons were discussed. In addition, the interaction among the nano precipitate phase particles, the deformation substructure and the dislocations were responsible for the thermal stability of the alloy within a certain temperature range.

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“…Wang ve Liu, AA7050 alaşımının ortogonal işlenmesinde 1000-5000 m/dak aralığındaki kesme hızlarında birincil deformasyon bölgesinde iş parçası malzemesinde sünek kırılma, 5000-7000 m/dak kesme hızlarında ise talaşta gevrek kırılmanın gerçekleştiğini, malzemenin kırılma ve deformasyon davranışının büyük gerilme hızları altında önemli derecede değiştiği ve bunun da talaş kaldırma mekanizmasını ve işlenmiş yüzey kalitesini doğrudan etkilediğini belirtmişlerdir [24]. Literatürde silisyumun (Si) alüminyum alaşımlarının dökülebilirlik ve mekanik özelliklerini [25], bakırın ise yüksek sıcaklık dayanımı ve mekanik özelikleri iyileştirdiği bilinmektedir [26]. Son yıllarda yapılan ar-ge çalışmaları neticesinde çinko içeren alüminyum esaslı malzemelerin kaymalı yataklarda üstün tribolojik özellikler sergilediği ve bronz, pirinç ve dökme demir gibi malzemelere alternatif olabileceği belirlenmiştir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Bakır ve Silisyum İlavelerinin Al-25Zn Alaşımının CVD Al2O3 Kaplamalı Takımlarla Tornalanmasında İşlenebilirliğe Etkisinin İncelenmesi

Bayraktar

Çamkerten

Salihoğlu

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, Al-25Zn-3Cu and Al-25Zn-3Cu-3Si alloys were obtained by adding Copper (Cu) and Silicon (Si) to Al-25Zn alloy using induction melting and permanent mold casting method. Microstructural and mechanical properties of alloys were determined. The internal structure of Al-25Zn consisted of α and η phases, while the internal structure of Al-25Zn-3Cu consisted of α, α + η and θ phases. In addition to these phases, eutectic and primary silicon particles were observed in the internal structure of Al-25Zn-3Cu-3Si. It was determined with the addition of Cu and Si that the hardness, yield and tensile strength of the alloy was increased and the breaking elongation was reduced. In addition, the machinability of these alloys in turning process was investigated experimentally and the effect of Cu and Si on machinability was revealed. As a result of cutting experiments, the highest cutting force was measured in Al-25Zn-3Cu-3Si alloy while the lowest cutting force was measured in Al-25Zn-3Cu alloy. The highest surface roughness value was measured in the Al-25Zn-3Cu-3Si alloy at all cutting speeds, while the lowest was in the Al-25Zn alloy. Figure A. Experimental setupPurpose: In this study, it was aimed to investigate the effect of Cu and Si on the machinability properties of Al-25Zn alloy.Theory and Methods: Firstly, microstructural and mechanical properties of alloys were determined by optical microscope and universal test methods, respectively. Cutting force and roughness values were measured with the Kistler dynamometer and surface roughness measuring device, respectively. The cutting performance of CVD-Al2O3 inserts was evaluated by imaging the adhesion formed at the insert with SEM (Scanning Electron Microscope).Results: The addition of Cu and Si to the Al-25Zn alloy increased the hardness, yield and tensile strength of the alloy, while reducing the breaking elongation. Si element was been found to worsen the machinability properties of alloy, but copper improved. Conclusion:In this study, the effect of Cu and Si on microstructural, mechanical and machinability properties of Al25-Zn alloy was presented. The results show that Cu and Si have a significant effect on the microstructural and mechanical properties and cutting performance of the alloy.

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Effect of graphite and transition elements (Cu, Ni) on high temperature tensile behaviour of Al–Si Alloys

Cited by 35 publications

References 20 publications

Enhancement of the Mechanical and Tribological Properties of Aluminum-Based Alloys Fabricated by SPS and Alloyed with Mo and Cr

Enhancement of the Mechanical and Tribological Properties of Aluminum-Based Alloys Fabricated by SPS and Alloyed with Mo and Cr

Mechanical Performances of Al-Si-Mg Alloy with Dilute Sc and Sr Elements

Bakır ve Silisyum İlavelerinin Al-25Zn Alaşımının CVD Al2O3 Kaplamalı Takımlarla Tornalanmasında İşlenebilirliğe Etkisinin İncelenmesi

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