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Modification of near-eutectic Al–Si alloys with rare earth element samarium

Published online by Cambridge University Press:  09 June 2014

Hongxu Qiu ,
Hong Yan  and
Zhi Hu
Hongxu Qiu
Affiliation:
Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing, Nanchang, Nanchang 330031, China
Hong Yan*
Affiliation:
Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing, Nanchang, Nanchang 330031, China
Zhi Hu
Affiliation:
Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China; and Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330031, China
*
a) Address all correspondence to this author. e-mail: hyan@ncu.edu.cn
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Abstract

The modification of near-eutectic Al–Si alloy with samarium additions (0–0.9 wt.% content) has been studied. The thermal analysis results indicated that the addition of Sm in Al–12Si alloy caused a depression of eutectic temperature (∆T E). And it was found that Sm was capable of breaking down the primary α-A1 phases, giving rise to an increment in the number of dendrites. Simultaneous primary Si refinement and eutectic modification were achieved by Sm addition. When 0.6 wt.% Sm was added to the alloy, the silicon in Al–12Si alloy was best refined and showed a fully modified, fine fibrous eutectic structure; the primary α-Al phase appears as a slightly dual dendritic-cellular nature and a pine-tree structure. Moreover, the mechanical properties were investigated by the tensile test. A good combination of ultimate tensile strength (217 MPa) and elongation (1.3%) was obtained when the addition of Sm was up to 0.6 wt.%.

Keywords

SmAl–12Si alloymicrostructuremechanical propertiestransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 11 , 14 June 2014 , pp. 1270 - 1277
Copyright
Copyright © Materials Research Society 2014 

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