Hypereutectic Al-Si Alloy with Completely Nodular Eutectic Silicon: Microstructure and Process

Wang, Ruyao

doi:10.11648/j.ijmsa.20160506.17

Cited by 4 publications

(4 citation statements)

References 19 publications

(22 reference statements)

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“…This prediction has been confirmed by Chinese workers [ 25 , 26 ] using an Al–Si alloy that had been obtained directly from a mixed electrolysis of Chinese bauxite. They found they could retain the modified structure up to an amazing 16 wt.% Si.…”

Section: Eutectic Structure Of Al–si Cast Alloyssupporting

confidence: 62%

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A Personal View of Microstructure and Properties of Al Alloys

Campbell

2021

Materials

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This paper presents a personal view by the author of the role of bifilms in Al alloys. The mantra ‘microstructure determines properties’ is widely accepted as a truism, but is here critically assessed and found wanting. The case is made that bifilms from the casting process, while often invisible in the microstructure, are usually at least as important, if not of far greater importance, because they are often present as a dense population of cracks throughout the metal. The bifilm population controls the morphology of many features of cast and wrought structures. For cast alloys, bifilm control of pore morphology and Si morphology in Al–Si alloys is discussed, as is dendrite arm spacing (DAS). The tensile property benefits of grain refinement are seen to be mainly bifilm controlled. The properties ductility and fatigue appear to be especially dominated by bifilm content, as are invasive corrosion processes such as pitting, intergranular corrosion, hydrogen blistering and cracking. Bifilm control is proposed as a new concept permitting the improvement and control of metallurgical properties.

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Section: Eutectic Structure Of Al–si Cast Alloyssupporting

confidence: 62%

“…Suppliers of primary metal should be capable of supplying ingots of substantially clean Al and Al alloys; the potential for the profoundly different behaviour of clean alloys is illustrated by Wang [ 26 ]. However, it seems at this time producers seem unaware of any advantage to providing such supplies.…”

Section: Eutectic Structure Of Al–si Cast Alloysmentioning

confidence: 99%

A Personal View of Microstructure and Properties of Al Alloys

Campbell

2021

Materials

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“…In Ref. [25], aluminum alloys with silicon content from 13 to 18 wt.% and Cu content 1.0 wt.% obtained at cooling rate 1.0 K/s, had a structure, consisting of α-Al and eutectics.…”

Section: Resultsmentioning

confidence: 99%

Influence of the rate of directional crystallization and silicon content on the structure and strength of the Al-Si-Cu alloy

Nikanorov S.P.,

Osipov V. N.,

Timashov R. B.

et al. 2023

Technical Physics

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The structure and strength of AlxSi-2wt.%Cu (x = 15, 17 and 20 wt.%) alloys obtained by directional solidification at a rate of 0.1 and 0.8 mm/s are investigated. It is shown that the tensile strength increases with an increase in the rate of solidification due to a decrease in the size of eutectic silicon and the transformation of its crystal flake into a fine-fiber one. In addition, there was an increase in tensile strength due to an increase of the share of the intermetallic phase, exceeding the reduced tensile strength due to an increase in the amount of the α-Al phase. An increase in the silicon content in the samples during solidification at a rate of 0.1 mm/s does not lead to a change in structure and strength. At a higher rate of solidification, there is a reduction of the share of eutectic and a decrease in strength. Keywords: aluminum alloys, eutectic, structure, tensile strength.

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“…Silicon particle crystals are harder than any other phases, which can typically be found in aluminum casting alloys. Although the hypereutectic Al-Si alloy offers excellent wear resistance, lower density and thermal expansion coefficient, and superior dimensional stability at high temperature, the appearance of coarse primary Si crystals seriously impairs its strength, toughness and machinability, limiting its usage in industry [24] A. Microstructure…”

Section: Resultsmentioning

confidence: 99%

Microscopical Characterization of Cast Hypereutectic Al-Si Alloys Reinforced with Graphene Nanosheets

Alghamdi

Ramadan

Halim

et al. 2018

Eng. Technol. Appl. Sci. Res.

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This paper illustrates the effects of stirring and graphene nanosheet (GNS) addition on the microstructure and mechanical behaviour of 393 hypereutectic Al-Si alloys used in the diesel engine pistons. Two processing routes were applied to fabricate hypereutectic Al-Si alloys: The first route mainly depends on stirring Al-Si alloys for 12 minutes at 400 rpm. The second one involves stirring Al-Si alloys for 2 minutes and then adding graphene nanosheets into the vortex, and consequently continue stirring for 10 minutes at 400 rpm. Results show that the distribution of the primary silicon was improved significantly in stir casting at both the edge and the center of the samples with relative reduction of 34% and 37% in the average particle size respectively. This average primary silicon size was further reduced by 17% with the addition of 1 wt% GNSs. GNS embedding into Al-Si alloy matrix resulted in remarkable increase in hardness values of the nanocomposites compared to the cast alloy.

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Hypereutectic Al-Si Alloy with Completely Nodular Eutectic Silicon: Microstructure and Process

Cited by 4 publications

References 19 publications

A Personal View of Microstructure and Properties of Al Alloys

A Personal View of Microstructure and Properties of Al Alloys

Influence of the rate of directional crystallization and silicon content on the structure and strength of the Al-Si-Cu alloy

Microscopical Characterization of Cast Hypereutectic Al-Si Alloys Reinforced with Graphene Nanosheets

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