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

Autor:	Jain Long Horng, Mu Lin Tsai, Hui Yun Bor, Chih Ting Wu, Sheng Long Lee, Yu Chih Tzeng
Rok vydání:	2014
Předmět:	Acicular Materials science Mechanical Engineering Metallurgy chemistry.chemical_element Condensed Matter Physics chemistry Mechanics of Materials Impurity Phase (matter) Ultimate tensile strength General Materials Science Scandium Ductility Elastic modulus Tensile testing
Zdroj:	Materials Science and Engineering: A. 593:103-110
ISSN:	0921-5093
DOI:	10.1016/j.msea.2013.11.039
Popis:	Iron is the most deleterious impurity in aluminum alloys and can easily combine with aluminum to form an acicular β-Al 5 FeSi 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-Al 5 FeSi phase into a comparatively harmless nodular Sc–Fe phase (Al 12 Si 6 Fe 2 (Mg,Sc) 5 ). This Sc–Fe phase has a lower hardness and elastic modulus than the β-Al 5 FeSi 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 0.12 wt% 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0c4adadfe815a11cb7b6c52510eb9a7c https://doi.org/10.1016/j.msea.2013.11.039 Zobrazit plný text záznamu Full Text from ScienceDirect