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Effects of rare-earth element addition and heat treatment on the microstructures and mechanical properties of Al-25 % Si alloy

Bo Dang, Zengyun Jian and Junfeng Xu


The effects of pouring temperature, the content of a rare earth (RE) metal modifier, and T6 heat treatment on the microstructure and mechanical properties of Al-25 % Si alloy were investigated. The results show that for the unmodified alloy, the morphology of primary Si was transformed from coarse polygons and platelets to fine polyhedral, and the average size decreased with increasing pouring temperature. The primary Si exhibited a small blocky morphology with an average size of 47 μm at an optimal content of 1.2 % RE. The tensile strength and elongation were enhanced by the addition of RE followed by the T6 heat treatment, and the maximum tensile strength and elongation (208.3 MPa and 1.01 %) were obtained for the sample modified with 1.2 % RE followed by the T6 heat treatment.

*Correspondence address, Prof. Zengyun Jian, The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xuefu Middle Road No. 2, Xi'an Shaanxi 710021, P. R. China, Tel.: +86-29-86173323, Fax: +86-29-86173323, E-mail:


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Received: 2016-11-01
Accepted: 2017-01-10
Published Online: 2017-03-31
Published in Print: 2017-04-13

© 2017, Carl Hanser Verlag, München