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 |
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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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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).</description><identifier>ISSN: 1359-6454</identifier><identifier>EISSN: 1873-2453</identifier><identifier>DOI: 10.1016/j.actamat.2012.03.031</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Alloys ; Aluminum ; Al–Si-based alloys ; Applied sciences ; Atom probe tomography ; Atomic force microscopy ; Crystal structure ; Eutectic modification ; Eutectics ; Exact sciences and technology ; Metals. 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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).</description><subject>Alloys</subject><subject>Aluminum</subject><subject>Al–Si-based alloys</subject><subject>Applied sciences</subject><subject>Atom probe tomography</subject><subject>Atomic force microscopy</subject><subject>Crystal structure</subject><subject>Eutectic modification</subject><subject>Eutectics</subject><subject>Exact sciences and technology</subject><subject>Metals. 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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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