Combined effects of cobalt addition and ultrasonic vibration on microstructure and mechanical properties of hypereutectic Al–Si alloys with 0.7% Fe

Sha, Meng; Wu, Shusen; Wan, Li

doi:10.1016/j.msea.2012.06.026

Cited by 40 publications

(14 citation statements)

References 16 publications

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“…Boron carbide and cow dung ash reinforcement phases are effectively formed in aluminium 7075 alloy which are analysed by x-ray diffraction analysis as shown in figure 3 for sample S3. The major elements present in cow dung ash is Si and predominant peaks (Al, B 4 C, Si and Ca) are observed which confirms the present of reinforced particles in the hybrid composite samples [45][46][47]. From the result it is clear that increase in weight percentage of CDA particles decreases the density of hybrid composites.…”

Section: Samplesupporting

confidence: 61%

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B₄C

Manikandan

2020

Mater. Res. Express

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This study focuses on fabricating aluminium hybrid metal matrix composites reinforced with ecofriendly agro waste, cow dung ash and boron carbide by two stage stir casting. Weight percentage of cow dung ash and boron carbide were added in ratios of 2.5:7.5, 5:5, and 7.5:2.5. The effects on mechanical properties like hardness, tensile strength, impact strength, flexural strength and wear behaviour were studied. SEM and EDX analysis were employed to study the fracture mechanism for tensile, impact and wear specimens. Optical microstructure images reveal uniform distribution of particles and XRD analysis confirms the presence of reinforcements. Increasing CDA particles has reduced the density of the hybrid composite up to 8%. A maximum increase in hardness, tensile strength and wear resistance was up to 30%, 56% and 56% respectively, and then a slight decrease in impact was found in increasing the CDA particles. Dimples, transgranular cleavage facets, cracks and micro ploughing, micro cuttings are revealed from the fractured specimens of tensile, impact and wear respectively.

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Section: Samplesupporting

confidence: 61%

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B₄C

Manikandan

2020

Mater. Res. Express

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“…Numerous approximate models have been proposed to explain the phenomena observed by experiments, such as the crystal defect model, quasi-crystalline model, and atomic clusters model (Bernal, 1959 ; Susskind and Becker, 1966 ; Schenk et al, 2002 ; Huang et al, 2011 ). It is widely accepted that metallic melts are composed of atomic clusters (Lou et al, 2013 ; Turnbull and Nagel, 1990 ; Bernal, 1959 ; Susskind and Becker, 1966 ; Li and Pederiva, 2003 ; Li et al, 2003 ; Xue et al, 2003 ; Huang et al, 2011 ; Schenk et al, 2002 ; Itami et al, 2003 ; Jakse and Pasturel, 2003 ; Shintani and Tanaka, 2006 ; Sreeja Kumari et al, 2007 ; Hwang et al, 2008 ; Hou et al, 2009 ; Seifeddine and Svensson, 2010 ; Vasisht et al, 2011 ; Sha et al, 2012 ; Li and Li, 2014 ; Zhai et al, 2014 ). According to this model, the metallic melts are composed of a large number of atomic clusters (short-range ordered) in the environment of free atoms (disordered), which is consistent with the results of the PDF in HTXRD.…”

Section: Introductionmentioning

confidence: 99%

Probing the Microstructure in Pure Al & Cu Melts: Theory Meets Experiment

et al. 2020

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In the present work, a new model of the atomic cluster structure, which is determined by metal Wulff construction with the crystal structure inside, is proposed to describe the structures of metallic melts. The shapes of the structures are determined by surface energies of different crystal plane groups, calculated from density functional theory (DFT), while the size is given by the pair distribution function (PDF) of the experimental high-temperature X-ray diffraction (HTXRD). Taking Aluminum (Al) and Copper (Cu) as the representative examples, we demonstrate that the simulated XRD curves from present models match the experimental results quite well, not only regarding the position and width of the peaks but also the relative intensity of the first and second peaks. These results indicate a successful model to describe the properties of metallic melts. The model also explains a main peak deviation phenomenon between the XRD of metallic melt and the solid ones in pure metal Al. Finally, a physical picture of metallic melt is given, which is mainly composed of atomic cluster structures and free atoms around them.

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“…The grain refinement mechanisms with ultrasonic treatment mainly consist of an increased nucleation rate and dendrite fragmentation [11,12]. In the former case, the collapse of cavity or bubble can generate extremely large pressure spikes to increase the freezing temperature of liquid, and the expansion of the cavity could also reduce the surface temperature of bubble; thus, nucleation could be promoted [13][14][15]. Moreover, cavitation could also improve the wettability of high-temperature stable particles that exist in the melt and turn them into nucleation sites [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasound on Heterogeneous Nucleation in TIG Welding of Al–Li Alloy

Chen

Lin

Yang

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The effect of ultrasound on heterogeneous nucleation in a tungsten inert gas (TIG) weld pool of 2195 Al-Li alloy has been investigated by a series of experiments. An ultrasonic vibration was imposed on the surface of base material before turning off the welding arc during the TIG welding implemented at a fixed point. The results suggest that ultrasound could promote heterogeneous nucleation in the TIG weld pool of 2195 Al-Li alloy. The grain around the fusion zone is changed from a column grain to an equiaxed grain after applying the ultrasonic treatment. To study the influencing mechanism of ultrasound on heterogeneous nucleation, further investigations were implemented where the welding arc was turned off after turning off the ultrasonic power. The results show that the equiaxed grain around the fusion zone disappeared gradually with an increase in heat input after turning off the ultrasonic power. It suggests that ultrasound could promote the heterogeneous nucleation particle to nucleate in advance before turning off the welding arc and the crystal nucleus could again be melted with an increase in heat input after turning off the ultrasonic power. Moreover, the effects of the welding current and ultrasonic amplitude on heterogeneous nucleation in the weld pool of 2195 Al-Li alloy were also investigated. Possible influencing mechanism of the welding current and ultrasonic amplitude on heterogeneous nucleation was discussed.

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Combined effects of cobalt addition and ultrasonic vibration on microstructure and mechanical properties of hypereutectic Al–Si alloys with 0.7% Fe

Cited by 40 publications

References 16 publications

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B₄C

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B₄C

Probing the Microstructure in Pure Al & Cu Melts: Theory Meets Experiment

Effect of Ultrasound on Heterogeneous Nucleation in TIG Welding of Al–Li Alloy

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Combined effects of cobalt addition and ultrasonic vibration on microstructure and mechanical properties of hypereutectic Al–Si alloys with 0.7% Fe

Cited by 40 publications

References 16 publications

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B4C

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B4C

Probing the Microstructure in Pure Al & Cu Melts: Theory Meets Experiment

Effect of Ultrasound on Heterogeneous Nucleation in TIG Welding of Al–Li Alloy

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Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B₄C

Mechanical and tribological behaviours of aluminium hybrid composites reinforced by CDA-B₄C