Structure of rapidly solidified aluminium-silicon alloys

Bose, Surajit; Kumar, Ranjeet

doi:10.1007/bf02403532

Cited by 63 publications

(16 citation statements)

References 9 publications

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“…Significant changes in hardness occur and are attributed to changes in the microstructure. Similar correlations between the microstructure and hardness were made with Al-Si and Al-Ni series alloys [5,6,18,[23][24][25]36,37]. On the other hand, intermetallic crystallization contributed to an improvement to the hardness at the expense of its ductility [36][37][38].…”

Section: Changes In Microhardnesssupporting

confidence: 50%

“…In this study, the mechanical properties of rapidly solidified ribbons and their ingot counterparts were determined by Vickers microhardness measurements. As performed in preceding literature studies [13][14][15][16][17][18][19][20][21][22][23][24][25]36,37], we first used one applied load (0.098 N) to measure the Vickers hardness value (H V ) of both ingot and melt-spun specimens. The values were calculated using the standard Vickers formula,…”

Section: Changes In Microhardnessmentioning

confidence: 99%

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Microhardness and morphologic characteristics of rapidly solidified Al-12Si-8Ni-5Nd alloy

Karaköse

Keskín

2010

Met. Mater. Int.

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Al-Si-Ni-Nd alloys with a nominal composition of Al-12 wt.% Si-8 wt.% Ni-5 wt.% Nd alloy are prepared by a conventional casting (ingot) and melt spinning technique at different cooling rates (v). The effects of the rapid solidification rate on the microstructures and microhardness performances of the specimen alloys are investigated in detail. The results obtained by the XRD, SEM and DSC show that the ingot and melt spun alloys have a multiphase structure. When v is 5 m/s, the alloy consists of four phases namely α-Al, intermetallic Al 3 Ni, Al 11 Nd 3 , and fcc Si. The melt-spun ribbons are completely composed of α-Al and eutectic Si phases, and primary silicon is not observed when v increases to 20 m/s, 25 m/s, 30 m/s and 35 m/s. The XRD analysis indicated that the solubility of Si in the α-Al matrix increases greatly with the rapid solidification. The change in microhardness is discussed based on the microstructural observations. The microhardness values of the melt spun ribbons are about three times higher than those of ingot counterparts.

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Section: Changes In Microhardnesssupporting

confidence: 50%

Section: Changes In Microhardnessmentioning

confidence: 99%

Microhardness and morphologic characteristics of rapidly solidified Al-12Si-8Ni-5Nd alloy

Karaköse

Keskín

2010

Met. Mater. Int.

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“…Careful examination of the alloy side showed that Si (produced from silica reduction) has reacted with Al to form dendrites (marked A) similar to those observed in other studies. [46,47] The Si concentration in the dendritic region varies from 40 to 60 pct. Furthermore, some regions in the alloy side show very high Si concentration (>90 pct), which can be distinguished as plates (marked B).…”

Section: Resultsmentioning

confidence: 99%

Effect of Silica on High-Temperature Interfacial Phenomena of Monolithic Refractories with Al Alloy

Koshy

Gupta

Sahajwalla

et al. 2008

Metall Mater Trans B

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An experimental study was conducted to study the interfacial phenomena between monolithic refractories and Al alloy at 1250°C. Dynamic contact angles of monolithic substrates with varying silica levels were measured using the sessile drop technique, while phases present in the preheated monolithic samples and interfacial reaction products were characterized using X-ray diffraction (XRD) and an electron probe microanalyzer (EPMA). The contact angles in the Al alloy/silica system were found to change much more rapidly as compared to that of the alloy/ alumina system, clearly demonstrating the high wetting tendency of silica. Under the tested conditions, the corundum phase forms at the interface while Mg was found to vaporize from the alloy and accumulate at the bottom of the monolithic substrate. Both these phenomena are shown to influence the intensity of contact angle variations with time and, thereby, the wetting behavior of monolithic substrates. Based on dynamic contact angles and equilibrium calculations, monolithic refractories are further classified into three groups, such that the wetting characteristics of those with compositions in the ranges of 0 to 25 pct, 25 to 45 pct, and >45 pct silica were shown to be dictated by the presence of corundum, mullite, and free silica, respectively, as the predominant phase.

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“…The form of Si changes according to the cooling rate, such as quench modification, thermal modification, or chemical modification [45]. Rapid cooling decreases the amount of Si ejected into the liquid by extending its solubility in Al [46], so ɑ-Al solidifies first in the preferential cellular structure leaving the residual Si at the boundaries [47].…”

Section: Discussionmentioning

confidence: 99%

Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality

et al. 2016

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Selective laser melting (SLM) is being widely utilised to fabricate intricate structures used in various industries. Widening the range of applications that can benefit from such promising technology requires validating SLM parts in load bearing applications. Recent studies have mainly focussed on static loading, with minor attention to cyclic loading despite its vital importance in many applications.In this work, the fatigue performance of SLM AlSi10Mg was investigated considering the effects of surface quality and heat treatment. Compared to heat treatment, machining the samples played a minor role in improving the fatigue behaviour. This is potentially attractive to industries interested in latticed structures and topology-optimised parts where post-processing machining is not feasible. The characteristically fine microstructure in the as-built samples provided good fatigue crack propagation resistance but none of them survived nominal fatigue life of 3x10 7 cycles within the maximum stress range of 63-220 MPa. A specially-tailored heat treatment increased the material's ductility, significantly improving its fatigue performance. At 94 MPa, the heat-treated samples survived beyond the nominal fatigue life, outperforming the reference cast material. The combined effect of machining and heat treatment yielded parts with far superior fatigue properties, promoting the material for a wider range of applications.

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Structure of rapidly solidified aluminium-silicon alloys

Cited by 63 publications

References 9 publications

Microhardness and morphologic characteristics of rapidly solidified Al-12Si-8Ni-5Nd alloy

Microhardness and morphologic characteristics of rapidly solidified Al-12Si-8Ni-5Nd alloy

Effect of Silica on High-Temperature Interfacial Phenomena of Monolithic Refractories with Al Alloy

Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality

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