Determination of Eutectic Solidification Mode in Sr-modified Hypoeutectic Al-Si Alloys by EBSD
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- Nogita Kazuhiro
- Department of Mining, Minerals and Materials Engineering, The University of Queensland
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- Dahle Arne Kristian
- Department of Mining, Minerals and Materials Engineering, The University of Queensland
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The effect of eutectic modification by strontium on nucleation and growth of the eutectic in hypoeutectic Al–Si foundry alloys has been investigated by electron back-scattering diffraction (EBSD) mapping. Specimens were prepared from three hypoeutectic Al–Si base alloys with 5, 7 and 10 mass%Si and with different strontium contents up to 740 ppm for modification of eutectic silicon. By comparing the orientation of the aluminium in the eutectic to that of the surrounding primary aluminium dendrites, the growth mode of the eutectic could be determined. The mapping results indicate that the eutectic grew from the primary phase in unmodified alloys. When the eutectic was modified by strontium, eutectic grains nucleated separately from the primary dendrites. However, in alloys with high strontium levels, the eutectic again grew from the primary phase. These observed effects of strontium additions on the eutectic solidification mode are independent of silicon content in the range between 5 and 10 mass%Si.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 42 (2), 207-214, 2001
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001204246548352
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- NII論文ID
- 10006546781
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD3MXis1ehtrk%3D
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 5718791
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可