Critical temperature for grain refining of primary Si in hyper-eutectic Al-Si alloy with phosphorus addition.

Kattoh, Haruyasu; Hashimoto, Akio; Kitaoka, Sanji; Sayashi, Mamoru; Shioda, Masahiko

doi:10.2464/jilm.52.18

Cited by 9 publications

(2 citation statements)

References 10 publications

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“…3,4 For Al-Si hypoeutectic alloys, the alkali elements (including strontium and sodium) are commonly used as silicon modifi ers. 5 In the case of Al-Si hypereutectic alloys, phosphorous is usually added in the form of Al-P, Al-Cu-P, or Cu-8 wt.% P Al-Fe-P master alloys.…”

Section: Introductionmentioning

confidence: 99%

Novel image analysis to determine the si modification for hypoeutectic and hypereutectic Al-Si alloys

Hernández¹,

Sokolowski

2005

JOM

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Aluminum Alloys Research SummaryThe aim of this research is to develop a novel analytical approach to determine the level of modifi cation of silicon in Al-Si hypoeutectic and hypereutectic alloys. Two standards to determine the level of modifi cation of silicon particles were investigated: the AFS Si Modifi cation Standard and the Primary Si Grade. 1,2 The fi rst method can only be used for Al-Si hypoeutectic alloys and the second one for Al-Si hypereutectic alloys. In both methods, the determination of the level of modifi cation of silicon is carried out by comparing micrographs of the test sample with the respective standards by simple observation. This results in a method with a bias error and does not take advantage of the analytical accuracy made possible by modern image analysis techniques. This paper presents a method known as image-analysis-based silicon modifi cation level, which provides highly reliable results to determine the level of silicon modifi cation for Al-Si hypoeutectic and hypereutectic alloys.

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Section: Introductionmentioning

confidence: 99%

Novel image analysis to determine the si modification for hypoeutectic and hypereutectic Al-Si alloys

Hernández¹,

Sokolowski

2005

JOM

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“…The growth and the role of the primary Si phase in the Al-Si alloys were investigated intensively. [5][6][7][8][9][10][11][12][13] Many researchers attempted to control the precipitation and the size of the primary Si in the matrix using many processes such as casting, spray forming and powder metallurgical technique.…”

Section: Introductionmentioning

confidence: 99%

Al/Al-Si Nano-Composite Graded Coating Prepared by Supersonic Free-Jet PVD

et al. 2004

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Increase of Si content increases wear resistant properties of hypereutectic Al-Si alloys. However, large primary Si phase is inevitable in AlSi alloy when the alloy is produced by conventional casting processes, which deteriorate its machinability as well as its mechanical properties. The objective of this study is to produce graded Al/Al-Si nanocomposite coating onto an A1050 Al alloy substrate by mixing Al and Si nanoparticles with Supersonic Free-Jet PVD (SFJ-PVD). The SFJ-PVD has been developed as a new coating method in which a coating film is formed by depositing nanoparticles with very high velocity onto a substrate. This SFJ-PVD provides a high deposition rate and produces a mixture of different kinds of nanoparticles formed in different evaporation chambers on the substrate. The graded Al/Al-Si coating film is produced by depositing Al and Si nanoparticles formed in different evaporation chambers with the controlled evaporation rates of Al and Si respectively. A smooth, compact and defect-free microstructure is formed both at the interface between the substrate and the coating film and inside the coating film. The graded Al-Si coating film has very fine, varying from 10 to 20 nm in diameter, Si phases in Al matrix. It is confirmed with nano-indentation hardness tester that the graded Al/Al-Si coating film on A1050 substrate has graded hardness from 0.65 to 5.9 GPa corresponding to the gradual compositional change of Si up to Al-57.8 at%Si.

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