The role of strontium in modifying aluminium-silicon alloys

M. Timpel, N. Wanderka, R. Schlesiger, T. Yamamoto, N. Lazarev, D. Isheim, G. Schmitz, S. Matsumura, J. Banhart

Research output: Contribution to journalArticle

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Abstract

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).

Original languageEnglish
Pages (from-to)3920-3928
Number of pages9
JournalActa Materialia
Volume60
Issue number9
DOIs
Publication statusPublished - May 1 2012

Fingerprint

Silicon alloys
Strontium
Eutectics
Aluminum alloys
Crystals
Twinning
Silicon
Tomography
Casting
Impurities
Transmission electron microscopy
Atoms

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Timpel, M., Wanderka, N., Schlesiger, R., Yamamoto, T., Lazarev, N., Isheim, D., ... Banhart, J. (2012). The role of strontium in modifying aluminium-silicon alloys. Acta Materialia, 60(9), 3920-3928. https://doi.org/10.1016/j.actamat.2012.03.031

The role of strontium in modifying aluminium-silicon alloys. / Timpel, M.; Wanderka, N.; Schlesiger, R.; Yamamoto, T.; Lazarev, N.; Isheim, D.; Schmitz, G.; Matsumura, S.; Banhart, J.

In: Acta Materialia, Vol. 60, No. 9, 01.05.2012, p. 3920-3928.

Research output: Contribution to journalArticle

Timpel, M, Wanderka, N, Schlesiger, R, Yamamoto, T, Lazarev, N, Isheim, D, Schmitz, G, Matsumura, S & Banhart, J 2012, 'The role of strontium in modifying aluminium-silicon alloys', Acta Materialia, vol. 60, no. 9, pp. 3920-3928. https://doi.org/10.1016/j.actamat.2012.03.031
Timpel M, Wanderka N, Schlesiger R, Yamamoto T, Lazarev N, Isheim D et al. The role of strontium in modifying aluminium-silicon alloys. Acta Materialia. 2012 May 1;60(9):3920-3928. https://doi.org/10.1016/j.actamat.2012.03.031
Timpel, M. ; Wanderka, N. ; Schlesiger, R. ; Yamamoto, T. ; Lazarev, N. ; Isheim, D. ; Schmitz, G. ; Matsumura, S. ; Banhart, J. / The role of strontium in modifying aluminium-silicon alloys. In: Acta Materialia. 2012 ; Vol. 60, No. 9. pp. 3920-3928.
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