The role of strontium in modifying aluminium–silicon alloys

Small amounts of strontium can transform the morphology of the eutectic silicon phase present in Al–Si casting alloys from coarse plate-like to fine fibrous networks. In order to understand this industrially important but hitherto insufficiently understood effect, the strontium distribution was stud...

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Veröffentlicht in:Acta materialia 2012-05, Vol.60 (9), p.3920-3928
Hauptverfasser: Timpel, M., Wanderka, N., Schlesiger, R., Yamamoto, T., Lazarev, N., Isheim, D., Schmitz, G., Matsumura, S., Banhart, J.
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container_end_page 3928
container_issue 9
container_start_page 3920
container_title Acta materialia
container_volume 60
creator Timpel, M.
Wanderka, N.
Schlesiger, R.
Yamamoto, T.
Lazarev, N.
Isheim, D.
Schmitz, G.
Matsumura, S.
Banhart, J.
description Small amounts of strontium can transform the morphology of the eutectic silicon phase present in Al–Si casting alloys from coarse plate-like to fine fibrous networks. In order to understand this industrially important but hitherto insufficiently understood effect, the strontium distribution was studied in atomic resolution by atom probe tomography and in nanometre resolution by transmission electron microscopy. The combined investigations indicate that Sr co-segregates with Al and Si within the eutectic Si phase. Two types of segregations were found: (i) nanometre-thin rod-like co-segregations of type I are responsible for the formation of multiple twins in a Si crystal and enable its growth in different crystallographic directions; (ii) type II segregations come as more extended structures, restrict growth of a Si crystal and control its branching. We show how Sr enables both kinds of mechanisms previously postulated in the literature, namely “impurity-induced twinning” (via type I) and growth restriction of eutectic Si phase (via type II).
doi_str_mv 10.1016/j.actamat.2012.03.031
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source ScienceDirect Journals (5 years ago - present)
subjects Alloys
Aluminum
Al–Si-based alloys
Applied sciences
Atom probe tomography
Atomic force microscopy
Crystal structure
Eutectic modification
Eutectics
Exact sciences and technology
Metals. Metallurgy
Segregations
Silicon
Strontium
Transmission electron microscopy
title The role of strontium in modifying aluminium–silicon alloys
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