Effects of scandium addition on iron-bearing phases and tensile properties of Al-7Si-0.6Mg alloys

Yu Chih Tzeng, Chih Ting Wu, Hui Yun Bor, Jain Long Horng, Mu Lin Tsai, Sheng Long Lee

研究成果: 雜誌貢獻期刊論文同行評審

67 引文 斯高帕斯(Scopus)

摘要

Iron is the most deleterious impurity in aluminum alloys and can easily combine with aluminum to form an acicular β-Al5FeSi phase that reduces ductility during the solidification of the molten metal. Adding scandium (Sc) to Al-7Si-0.6Mg alloys can transform the acicular β-Al5FeSi phase into a comparatively harmless nodular Sc-Fe phase (Al12Si6Fe2(Mg,Sc)5). This Sc-Fe phase has a lower hardness and elastic modulus than the β-Al5FeSi phase; it is thus less likely to initiate cracks in the Al matrix. Moreover, the nodular Sc-Fe phase can improve the fluidity of Al during solidification, reducing interdendritic shrinkage. Tensile testing measurements showed that the elongation of Al-7Si-0.6Mg alloys with 0.04 and 0.12wt% Sc can be respectively increased by 115% and 110% compared to Al-7Si-0.6Mg without Sc. The corresponding quality indices are increased by 17% and 19%, respectively, suggesting that the tensile properties of Al-7Si-0.6Mg alloys can be enhanced by adding scandium.

原文???core.languages.en_GB???
頁(從 - 到)103-110
頁數8
期刊Materials Science and Engineering A
593
DOIs
出版狀態已出版 - 21 1月 2014

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