Synergy of nano carbon black inoculation and high intensity ultrasonic processing in cast magnesium alloys

Bhingole, P.P.; Chaudhari, G.P.

doi:10.1016/j.msea.2012.07.104

Cited by 33 publications

(23 citation statements)

References 30 publications

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“…These result in improved distribution of in situ formed hard oxide particles in the UST processed MMCs. Other work on the ultrasonic processing of MMCs supports this hypothesis [19][20][21][22]27,28].…”

Section: Distribution Of In Situ Formed Oxidesmentioning

confidence: 87%

“…This results in enhanced wetting of in situ formed insoluble non-metallic particles that may be normally not wettable by the alloy melt [18,27]. Under the action of high-pressure pulses, their wettability is improved by filling of the micro cracks and defects present on their surfaces [18,28]. Improved wettability promotes the incorporation of particles in the melt.…”

Section: Distribution Of In Situ Formed Oxidesmentioning

confidence: 99%

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Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

Bhingole

Chaudhari

Nath

2014

Composites Part A: Applied Science and Manufacturing

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Section: Distribution Of In Situ Formed Oxidesmentioning

confidence: 87%

Section: Distribution Of In Situ Formed Oxidesmentioning

confidence: 99%

Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

Bhingole

Chaudhari

Nath

2014

Composites Part A: Applied Science and Manufacturing

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“…Recent work on ultrasonic refinement of binary Mg-Al and Mg-Zn alloys [142,147] and commercial magnesium alloys [146,148,149] has further confirmed that the inverse growth restriction model applies to microstructural refinement by intensive ultrasonication.…”

Section: Grain Refinement Of Mg-al Alloys Via Ultrasonic Treatmentmentioning

confidence: 90%

Grain Refinement of Magnesium Alloys: A Review of Recent Research, Theoretical Developments, and Their Application

StJohn

Easton

Qian

et al. 2012

Metall Mater Trans A

211

114

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This paper builds on the ''Grain Refinement of Mg Alloys'' published in 2005 and reviews the grain refinement research on Mg alloys that has been undertaken since then with an emphasis on the theoretical and analytical methods that have been developed. Consideration of recent research results and current theoretical knowledge has highlighted two important factors that affect an alloy's as-cast grain size. The first factor applies to commercial Mg-Al alloys where it is concluded that impurity and minor elements such as Fe and Mn have a substantially negative impact on grain size because, in combination with Al, intermetallic phases can be formed that tend to poison the more potent native or deliberately added nucleant particles present in the melt. This factor appears to explain the contradictory experimental outcomes reported in the literature and suggests that the search for a more potent and reliable grain refining technology may need to take a different approach. The second factor applies to all alloys and is related to the role of constitutional supercooling which, on the one hand, promotes grain nucleation and, on the other hand, forms a nucleation-free zone preventing further nucleation within this zone, consequently limiting the grain refinement achievable, particularly in low solute-containing alloys. Strategies to reduce the negative impact of these two factors are discussed. Further, the Interdependence model has been shown to apply to a broad range of casting methods from slow cooling gravity die casting to fast cooling high pressure die casting and dynamic methods such as ultrasonic treatment.

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“…Other variations include a niobium sonotrode [25] and in some cases titanium sonotrodes are coated with a boron nitride layer to prevent attack by aluminium alloys. In addition, recent work on ultrasonication of Mg-Al and Mg-Zn alloys [26,27] and of aluminium alloys [25] has shown that ultrasonic grain refinement depends significantly on alloy chemistry (i.e. solute type and solute content).…”

Section: Discussionmentioning

confidence: 99%

The role of ultrasonic treatment in refining the as-cast grain structure during the solidification of an Al–2Cu alloy

Wang¹,

Dargusch²,

Qian³

et al. 2014

Journal of Crystal Growth

118

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Abstract. The effect of Ultrasonic Treatment (UT) over selected temperature ranges during cooling and solidification of an Al-2Cu alloy melt on the grain structure and cooling behaviour of the alloy has been investigated using a molybdenum sonotrode introduced without preheating. UT was applied over various temperature ranges before, during and after the nucleation of primary aluminium grains. It was found that ultrasonic grain refinement was achieved only when UT was applied from more than 20 o C above the liquidus temperature until below the liquidus temperature after nucleation has occurred. Applying UT from 40 o C or 60 o C above the liquidus to just above the liquidus brings the melt to a condition that favours nucleation, survival of the nucleated grains and their subsequent transport throughout the melt. Continuing to apply UT beyond the liquidus for a short time enhances both nucleation and convection thereby ensuring the formation of a fine, uniform equiaxed grain size throughout the casting. The lack of grain refinement when UT was applied from 20 o C above the liquidus temperature or from temperatures below the liquidus temperature is attributed to the formation of a strong solidified layer on the sonotrode which hinders the effective transmission of ultrasonic irradiation into the liquid metal. The application of a preheated sonotrode showed that formation of a solid layer can be prevented by preheating the sonotrode to 285 o C. Thus, an appropriate amount of superheat of the liquid metal or sufficient preheating of the sonotrode is necessary for ultrasonic grain refinement when a sonotrode is introduced into the melt.

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Synergy of nano carbon black inoculation and high intensity ultrasonic processing in cast magnesium alloys

Cited by 33 publications

References 30 publications

Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

Grain Refinement of Magnesium Alloys: A Review of Recent Research, Theoretical Developments, and Their Application

The role of ultrasonic treatment in refining the as-cast grain structure during the solidification of an Al–2Cu alloy

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