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Microstructural evolution and mechanical properties of Mg–Cu–Zn ultrafine eutectic composites

Published online by Cambridge University Press:  31 January 2011

Gi A. Song ,
Wonhee Lee ,
Nae S. Lee ,
Ki B. Kim ,
Jin M. Park ,
Do H. Kim ,
Do H. Kim ,
Jaeseoul Lee  and
Jun-Sik Park
Ki B. Kim*
Affiliation:
Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Gwnagjin-gu, Seoul 143-747, Korea
Do H. Kim
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seodaemungu, Seoul 120-749, Korea
Jaeseoul Lee
Affiliation:
Korea Institute of Industrial Technology (KITECH), Buk-gu, Gwangju 500-480, Korea
Jun-Sik Park
Affiliation:
Division of Advanced Materials Engineering, Hanbat National University, Daejoen 305-719, Korea
*
a) Address all correspondence to this author. e-mail: kbkim@sejong.ac.kr
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Abstract

Novel ultrafine eutectic composites containing structural and spatial heterogeneities have been systematically developed in an Mg–Cu–Zn ternary system. Microstructural investigations of the ultrafine eutectic composites revealed that the bimodal eutectic structure consists of a mixture of cellular-type fine (α-Mg + MgZn2) and anomalous-type coarse (α-Mg + MgZn2 + MgCuZn) eutectic structures. An Mg72Cu5Zn23 alloy composed of the bimodal eutectic structure without micron-scale α-Mg dendrites presents a strong improvement of yield strength up to 455 MPa with a decent plastic strain of 5%. The rotation of the bimodal eutectic colony along the interfaces is considered to be an effective way to dissipate the stress localization thus enhancing the macroscopic plasticity.

Keywords

AlloyMicrostructureNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 9 , September 2009 , pp. 2892 - 2898
Copyright
Copyright © Materials Research Society 2009

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