Fluidity of aluminum alloys and composites: A review

Ravi, K.R.; Pillai, R. M.; Amaranathan, K.R.; Pai, B.C.; Chakraborty, M.

doi:10.1016/j.jallcom.2007.02.038

Cited by 201 publications

(88 citation statements)

References 30 publications

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“…The best way to reduce the effects of surface tension is to cover the surface of the mold which reduces the friction between the melt and mold wall by providing a smooth surface and reduced surface roughness of the mold. Some coatings improve fluidity through reactions that reduce the wettability of the melt/mold interface [9][10][11][12][13].…”

Section: Fig 1 Schematic View Of Porous Spongementioning

confidence: 99%

“…Several studies [4][5][6][7][8][9][10][11] have shown that increasing the cooling rate of the part reduces shrinkage defects or leads to finer and more uniform distribution of shrinkage defects. The radiographic image of 6 (d) shows a casting sample with a thickness of 2 mm in an uncoated sand mold.…”

Section: Fig 6 the Xrd Radiography Images Of Casting Samples (A) Tomentioning

confidence: 99%

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Evaluation of nano ceramic coating on radiographic defects of thin-walled AL4-4 aluminum alloy sand casting

Borouni¹,

Niroumand²,

Fathi³

2016

Metall Mater Eng

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Internal defects are among the problems in gravity casting of aluminum parts. The main internal volumetric defects are gas and shrinkage defects which form during solidification of the melt and drastically reduce the quality of the produced parts. These defects adversely affect the mechanical properties of thin walled castings parts. In this study, ceramic nanoparticles coatings were applied on the sand mold and the effect of mold coatings on the reduction of defects were investigated. X-ray radiography was used to detect defects in sand molds with ceramic nanoparticles coatings. For comparison, this test was performed on molds with micro-ceramic and graffiti coatings and uncoated sand mold. The results showed that the maximum amount of gas and shrinkage defects was observed in casting parts from AL4-1 alloy in uncoated molds. On the other hand, the minimum defects were found in molds coated with ceramic nanoparticles. It seems that the reduced defects in casting parts in molds coated with ceramic nanoparticles may be due to high thermal and chemical stability and higher heat transfer rate of the coating. These results can facilitate the production of high quality aluminum alloys parts using nanotechnology.

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Section: Fig 1 Schematic View Of Porous Spongementioning

confidence: 99%

Section: Fig 6 the Xrd Radiography Images Of Casting Samples (A) Tomentioning

confidence: 99%

Evaluation of nano ceramic coating on radiographic defects of thin-walled AL4-4 aluminum alloy sand casting

Borouni¹,

Niroumand²,

Fathi³

2016

Metall Mater Eng

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“…그러 나, Mg의 강한 산소친화력 때문에 용해 및 주조공정 중에 산 화 및 발화를 일으켜 사용이 제한적이다 [4,5]. 산화 및 발화 현상으로 인해 발생된 산화물은 공정 중에 용탕에 혼입되어 용탕의 유동성을 떨어뜨리고 최종 제품의 특성을 저하시킨다 [6]. 이와 같은 문제를 해결하기 위한 일반적인 방법으로 Be 첨가가 고려되어질 수 있다 [7,8].…”

Section: 서 론unclassified

Effect of Al<sub>2</sub>Ca on Oxidation Resistance and Tensile Property of Al-5Mg Alloy

Ha¹,

Yoon²,

Kim³

2014

Journal of Korea Foundry Society

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The effect of Al 2 Ca on the oxidation resistance and tensile property of Al-5Mg alloys was investigated. According to the TGA (Thermogravimetric analysis) result at 550 o C after 24hrs, the Al-5Mg alloy showed parabolic behavior with weight gain. On the other hand, there was almost no difference in the weight changes of the Al 2 Ca added Al-5Mg alloys during the oxidation. It was thought that the improvement of oxidation resistance in Al 2 Ca added Al-5Mg alloys might be due to the formation of a protective oxide layer with CaO and MgO on the surface. The microstructures of the alloys showed grain refinement with an increasing Al 2 Ca content. From the tensile test, the yield strength of the alloys were improved with an increasing Al 2 Ca content. The 0.07 mass%Al 2 Ca added Al-5Mg alloy showed similar elongation and increased strength, simultaneously. It was considered that the addition of Al 2 Ca, which was superior in the oxidation resistance of Al, reduced the formation of Mg oxides and inclusions during the alloying. This, partly led to the improvement of tensile properties. . 이와 같은 문제를 해결하기 위한 일반적인 방법으로 Be 첨가가 고려되어질 수 있다 [7,8]. 그러나, Be의 강한 독성 때 문에 대체방안이 요구된다 [7,8].한편, 한 연구보고에 따르면 합금원소로서 순Mg이 아닌

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“…한편 Al-Si 합금의 유동도에 미치는 소량의 용존가스의 영향은 미미 하다고 보고하였다 [11][12][13]. 반면, 용탕 내의 산화물 개재물은 특히 낮은 주입온도에서 유동도를 감소시킨다는 보고가 있다 [14].…”

Section: 서 론unclassified

Degassing of Molten A328 Aluminum Alloy by Ultrasonic Vibration

Choe¹,

Jang²,

Lim³

et al. 2011

Journal of the Korea Foundry Society

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A328 alloy is an attractive candidate for recycle-friendly aluminum alloy in the recycling of automotive components. In this study, A328 alloy melt was degassed by ultrasonic vibration and the effect of treatment time on the density, fluidity and mechanical properties was investigated. Experimental results reveal that a constant value of density can be reached after less than 180 seconds of ultrasonic treatment time, but the density decreased when the treatment time was 300 seconds. Ti which was dissolved from the horn during ultrasonic treatment reduced the fluidity of melt. After degassing by ultrasonic vibration for 180 seconds, tensile strength increased from 201MPa to 250MPa, and elongation increased from 2.38% to 3.50%, however, further treatment deteriorated the mechanical properties.Key words: Ultrasonic vibration, Degassing, Cavitation, Die-casting, A328 alloy.

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Fluidity of aluminum alloys and composites: A review

Cited by 201 publications

References 30 publications

Evaluation of nano ceramic coating on radiographic defects of thin-walled AL4-4 aluminum alloy sand casting

Evaluation of nano ceramic coating on radiographic defects of thin-walled AL4-4 aluminum alloy sand casting

Effect of Al<sub>2</sub>Ca on Oxidation Resistance and Tensile Property of Al-5Mg Alloy

Degassing of Molten A328 Aluminum Alloy by Ultrasonic Vibration

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