Influence of Ti, B and Sr on the microstructure and mechanical properties of A356 alloy

Mallapur, D.G.; Kori, S.A.; Udupa, K. Rajendra

doi:10.1007/s10853-010-4977-3

Cited by 43 publications

(24 citation statements)

References 14 publications

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“…While Al-B master alloys were shown to be more effective with Al-Si alloys [10,13,14,[18][19][20], the industrial practice today relies almost entirely on the AlTi5B1 grain refiner. The search for alternative grain refiners and more effective grain refinement practices has intensified in recent years [21][22][23][24]. The present work was undertaken to investigate the potential of AlB3 master alloy in the grain refinement of AlSi10Mg and AlSi12Cu foundry alloys.…”

Section: Introductionmentioning

confidence: 99%

AlB3 master alloy to grain refine AlSi10Mg and AlSi12Cu aluminium foundry alloys

Birol

2012

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

AlB3 master alloy to grain refine AlSi10Mg and AlSi12Cu aluminium foundry alloys

Birol

2012

Journal of Alloys and Compounds

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“…The impact of B and Sr additions on grain refinement and modification has been reported by several investigators [29][30][31][32][33][34]. The present paper reports the results of additional experiments where B and Sr are added to the popular AlSi7Mg0.3 alloy either individually or together in an effort to identify a sound and cost-effective melt treatment practice for hypoeutectic Al-Si-based foundry alloys.…”

Section: Introductionmentioning

confidence: 65%

Melt treatment of Al–Si foundry alloys with B and Sr additions

Birol

2017

J Mater Sci

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Individual Sr and B additions to Al-Si alloy melts fail to provide either grain refinement or modification. Sr and B must be used together to achieve both features for high-quality sound castings. Sr and B solutes in addition to insoluble SrB 6 particles are introduced to the melt when Sr and B are used together. SrB 6 particles and B solutes, which form the AlB 2 particles later during solidification, are believed to be responsible for the marked improvement in grain refinement in the co-addition practice. Sr atoms in liquid solution, on the other hand, are adsorbed on the surface of the Si plates leading to twinning once the melt cools to the eutectic solidification temperature. A series of experiments have shown that a very fine grained matrix and a fine fibrous eutectic are readily obtained when the AlSi7Mg0.3 alloy is inoculated with 100 ppm B and 150 ppm Sr.

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“…In particular, Ti is widely used for grain refinement, notably through added Al-Ti-B grain-refining master alloys [30]. Even though the exact mechanisms of grain refinement in aluminium wrought and casting alloys are not yet fully understood, it is known that operative phases are TiAl 3 and TiB 2 [31,32] (the EDXS analysis in this work unfortunately cannot detect B).…”

Section: Discussionmentioning

confidence: 86%

Silicon particle pinhole defects in aluminium–silicon alloys

2016

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It was recently shown that silicon particles in heat-treated Al-Si casting alloys can contain flaws such as surface pinholes and grooves, which cause varying degrees of reduction in the in situ particle fracture strength and hence influence the mechanical properties of this class of alloys. In this work, we show that the formation of one class of such strength-limiting flaws in solidified and coarsened Si particles, namely surface pinholes, is caused by alloy impurities such as Fe and Ti in both binary eutectic Al-Si alloys and also in casting alloy A356. This is evidenced by using Focused Ion Beam serial sectioning tomography coupled with Energy-Dispersive X-Ray Spectroscopy, and confirmed by the observation that a high-purity Al-Si alloy presents a significantly lower proportion of pinholes along the surface of the silicon phase than does an alloy of commercial purity. A similar correlation between alloy purity and the formation of another, more severe strength-limiting particle defect, namely grooved interfaces, was on the other hand not found.

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Influence of Ti, B and Sr on the microstructure and mechanical properties of A356 alloy

Cited by 43 publications

References 14 publications

AlB3 master alloy to grain refine AlSi10Mg and AlSi12Cu aluminium foundry alloys

AlB3 master alloy to grain refine AlSi10Mg and AlSi12Cu aluminium foundry alloys

Melt treatment of Al–Si foundry alloys with B and Sr additions

Silicon particle pinhole defects in aluminium–silicon alloys

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