Startseite The effect of cooling rate on the microstructure and mechanical properties of Mg–Zn–Gd-based alloys
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The effect of cooling rate on the microstructure and mechanical properties of Mg–Zn–Gd-based alloys

  • Yong Liu , Guangyin Yuan , Jian Yin , Chen Lu , Wenjiang Ding und J. Z. Jiang
Veröffentlicht/Copyright: 11. Juni 2013
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Abstract

The microstructure and mechanical properties of Mg3.5Zn0.6Gd and Mg3.5Zn0.6Gd1.5Cu alloys were investigated under different solidification conditions. The microstructure and phase constitutions of alloys were characterized using optical microscopy, scanning electron microscopy, X-ray diffraction and differential thermal analysis. The results indicate that the cooling rate plays an important role in grain refinement and phase constitutions of Mg – Zn – Gd alloys. In the cooling rate range from 4.8 K s− 1 to 18.5 K s− 1 for the Mg – Zn – Gd system, higher content of the icosahedral phase (I-phase) was obtained under the condition of higher cooling rate which accelerated the nucleation and growth of the I-phase. Under the cooling rate of 18.5 K s− 1, the mechanical properties of the Mg3.5Zn0.6Gd alloy were further improved by the high I-phase content due to its unique icosahedral structure, in addition to the contribution of grain refinement.


* Correspondence address, Dr. Yong Liu International Center for New-Structured Materials (ICNSM) Zhejiang University and Laboratory of New-Structured Materials, Department of Materials Science and Engineering Zhejiang University, Hangzhou 310027, PR China 38 Zheda Road, Hangzhou Tel.: +86 571 87951528 E-mail:

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Received: 2007-10-2
Accepted: 2008-5-16
Published Online: 2013-06-11
Published in Print: 2008-09-01

© 2008, Carl Hanser Verlag, München

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