hypoeutectic alloy


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hypoeutectic alloy

[¦hī·pō·yü′tek·tik ′al‚ȯi]
(metallurgy)
Any binary alloy whose composition lies to the left of the eutectic.
References in periodicals archive ?
Alternative Modification of A356 Hypoeutectic Alloy by Ca-Si-Ba Additions" Alexandre Bois-Brochu and Marin Gheorghe, Centre de Metallurgie du Quebec, Trois-Rivieres, Quebec, Canada; Francis Breton, Rio Tinto, Arvida Research and Development Centre, Ontario, Canada
This chemical modification is used for Al-Si hypoeutectic alloys.
Figure 1b shows regularly-shaped graphite flakes in a hypoeutectic alloy with high C content.
14], the nucleation of Si during the solidification of Al-Si hypoeutectic alloys appears to result from a hierarchy of nucleating substrates operating at progressively lower temperatures: (1) AlP, whose generally particulate morphology can initiate the formation of compact Si particles as seen in hypereutectic alloys, (2) oxide bifilms alone, whose planar form creates plate-like Si morphologies, and (3) a currently unknown nucleant that initiates the coral eutectic growth morphology.
It was realized that, to have the thixoforming process of these hypoeutectic alloys correctly applied, it is necessary to achieve a temperature where AlFCC coexists with the liquid rich-silicon; nevertheless, the semisolid behaviour will depend on the remaining solid's morphology and shape.
As part of a larger program to establish statistically validated mechanical properties for E357-T6 sand castings, this weld repair study was designed to consolidate industry best practices to establish an AFS Recommended Practice for the in-process weld repair of aluminum-silicon hypoeutectic alloys, develop mechanical properties to demonstrate the efficacy of the practice, and develop statistical data that facilitates acceptance of the weld practice.
The research team will develop a practice for in-process weld repair of aluminum-silicon hypoeutectic alloys, track the mechanical properties to demonstrate the effectiveness of the practice and provide a statistical basis for acceptance.
For hypoeutectic alloys, liquidus (TL) should have a well-defined plateau indicating dendritic growth.
In aluminum-silicon (Al-Si) hypoeutectic alloys, strontium is often added for modification of the Si structure during the alloying process.