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Effects of minor additions of cerium, silicon and calcium on microstructure and mechanical properties of AZ91 magnesium alloy

  • Redeemina C. Bonnah , Yu Fu and Hai Hao


The effects of minor Ce, Si and Ca additions on the microstructure and mechanical properties of the as-cast and T6 state AZ91 alloy were analyzed and compared in this paper by means of optical microscopy, scanning electronic microscopy, X-ray diffraction and tensile testing. Results showed that the addition of Ce and Ca could effectively modify the β-phase and the average grain size was refined from 239.7 ± 16.9 μm in AZ91 alloy to 57.8 ± 1.4 μm in AZ91-1.0Ce-0.5Ca alloy. Accordingly, the as-cast AZ91-1.0Ce-0.5Ca alloy showed optimum yield strength of 119 MPa and elongation of 10.7 %. Furthermore, AZ91-1.0Ce-0.5Ca alloy possesses a higher effect in the reduction of the discontinuous precipitates after aging and the yield strength increased to 164 MPa with elongation of 11.8 %.

Correspondence address, Professor Hao Hai, Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Number 2 Linggong Road: High Technology Zone, Dalian 116024, P.R. China, Tel.: +86 411 8470 9458, E-mail:


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Received: 2019-02-20
Accepted: 2019-10-07
Published Online: 2020-03-16
Published in Print: 2020-03-11

© 2020, Carl Hanser Verlag, München

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