Progress on phase equilibria of the Al Si Zr system at 700 and 900 °C

Ya, Liu; Tang, Maoyou; Wu, Changjun; Wang, Jianhua; Su, Xuping

doi:10.1016/j.jallcom.2016.09.142

Cited by 8 publications

(1 citation statement)

References 28 publications

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“…It is also known that silicon atoms can partially substitute aluminium in the compound Al 3 Zr [14]. Nevertheless, experimental information for the ternary Al-Si-Zr system is scarce and available only at temperatures above 700 • C [12,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

Kiradzhiyska

Vassilev

Mancheva

et al. 2021

Metals

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A typical modification technique of the functional properties of Al–Si based alloys is the addition of some third element in trace level. In the present work, ternary Al–Si–Zr bulk and ribbon alloys have been prepared. The kinetics of high-temperature surface oxidation has been studied by thermogravimetric method. It was found that at the start of the experiment the chemical reaction velocity is rate-controlling while for longer times the (oxygen) diffusion is the rate-controlling process. Activation energy of the two stages of oxidation has been obtained. Additional studies such as thermochemical analysis, optical and electron microscopy, and microhardness tests have been done.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

Kiradzhiyska

Vassilev

Mancheva

et al. 2021

Metals

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The Effect of Zr and Li on the Microstructure of AlMg5Si2Mn-Type Casting Alloys

Boyko,

Mykhalenkov,

Springer

et al. 2024

Inter Metalcast

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In the article, the authors present results of microstructural studies of Al-Mg-Si-Mn casting alloys with Zr, Li, and TiB2 additions on a broad scale. Zirconium content was set on two levels: 0.34 and 1.58 wt%, and Li was set 1.2 and 2.0 wt%. It was found that the addition of Zr shifts the eutectic melting temperature to a higher level, up to 611.3 °C at 1.6 wt% Zr. At the same time, Li addition leads to the depression of eutectic melting temperature: down to 587.2 °C at 2.0 wt% Li, what is a common effect of eutectic modification which was confirmed by means of structural examinations. The complex addition of Li and AlTi5B1 resulted in a eutectic melting temperature close to the equilibrium eutectic temperature for the Al-Mg-Si system (596.2 °C). The grain refinement effect of Zr is due to the nucleation of α-Al on the Zr(Al1−x, Six)3 phase. Crystals of this phase were detected in the grain centers of Zr-containing alloys. The Li addition does not affect α-Al grain size but changes the morphology of eutectic colonies from petal-like to fibrous. Observation of TiB2 particles inside the primary Mg2Si crystals gives direct experimental confirmation of nucleation of the primary phase on the surface of TiB2 in the alloy after adding Li and AlTi5B1. Natural aging of the alloys resulted in the formation of fine precipitates detected close to dislocations. The most apparent supposition is that the mechanism responsible for their formation is heterogeneous nucleation in the stress field of dislocations. Hardness tests showed adding 2.0 wt% of Li is very effective, increasing hardness up to 113 HV0.2 in naturally aged condition, which is nearly double that of commercial Al-Mg-Si die-casting alloy. Several effects were proposed which may synergistically contribute to the rise of hardness in Li-containing alloys, such as solid solution strengthening, formation of primary LiAlSi phase and natural aging.

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Impurity phases and their removal in Si purification with Al–Si alloy using transition metals as additives

Lei

et al. 2018

Journal of Alloys and Compounds

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Progress on phase equilibria of the Al Si Zr system at 700 and 900 °C

Cited by 8 publications

References 28 publications

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

The Effect of Zr and Li on the Microstructure of AlMg5Si2Mn-Type Casting Alloys

Impurity phases and their removal in Si purification with Al–Si alloy using transition metals as additives

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