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Solidification and Microstructure Control of Mg-rich Alloys in the Mg-Zn-Y Ternary Systemya

Published online by Cambridge University Press:  17 March 2011

E.S. Park ,
S. Yi ,
J.B. Ok ,
D.H. Bae ,
W.T. Kim  and
D.H. Kim
E.S. Park
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchondong Seodaemungu, Seoul, 120-749, Korea
S. Yi
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchondong Seodaemungu, Seoul, 120-749, Korea
J.B. Ok
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchondong Seodaemungu, Seoul, 120-749, Korea
D.H. Bae
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchondong Seodaemungu, Seoul, 120-749, Korea
W.T. Kim
Affiliation:
Center for Non-crystalline Materials, Department of Physics, Chongju University, 36 Naedokdong, Chongju, 360-764, Korea
D.H. Kim
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchondong Seodaemungu, Seoul, 120-749, Korea
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Abstract

Solidification microstructures of Mg rich Mg-Zn-Y alloys were studied by using optical microscopy, scanning electron microscopy and transmission electron microscopy. Pseudo eutectic reaction (Liquid→α-Mg + icosahedral phase) takes place during solidification. Alloys containing high Mg content solidifies by primary crystallization ofα-Mg followed by the eutectic reaction at interdendritic region. Mg68Zn28Y4 alloy solidifies by primary crystallization of I-phase followed by theeutectic reaction into a mixture of α-Mg and I-phase. Occasionally D-phase and Mg4Zn7 phases were observed to form with orientation relationships with previously formed I-phase and D-phase, respectively. Thestrength of the alloys increased with increasing the volume fraction of I-phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K2.5
Copyright
Copyright © Materials Research Society 2001

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