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High-strength bulk Al-based bimodal ultrafine eutectic composite with enhanced plasticity

Published online by Cambridge University Press:  31 January 2011

Jin Man Park ,
Norbert Mattern ,
Uta Kühn ,
Jürgen Eckert ,
Ki Buem Kim ,
Won Tae Kim ,
Kamanio Chattopadhyay  and
Do Hyang Kim
Jin Man Park
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and Center for Non-Crystalline Materials, Yonsei University, Seoul 120-749, Republic of Korea
Uta Kühn
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, D-01171 Dresden, Germany
Jürgen Eckert*
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
Ki Buem Kim
Affiliation:
Department of Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea
Won Tae Kim
Affiliation:
Division of Applied Science, Cheongju University, Cheongju 360-764, Republic of Korea
Kamanio Chattopadhyay
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560-012, India
Do Hyang Kim*
Affiliation:
Center for Non-Crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Republic of Korea
*
a) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy
b) Address all correspondence to this author. e-mail:dohkim@yonsei.ac.kr
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Abstract

An in situ bulk ultrafine bimodal eutectic Al–Cu–Si composite was synthesized by solidification. This heterostructured composite with microstructural length scale hierarchy in the eutectic microstructure, which combines an ultrafine-scale binary cellular eutectic (α-Al + Al2Cu) and a nanometer-sized anomalous ternary eutectic (α-Al + Al2Cu + Si), exhibits high fracture strength (1.1 ± 0.1 GPa) and large compressive plastic strain (11 ± 2%) at room temperature. The improved compressive plasticity of the bimodal-nanoeutectic composite originates from homogeneous and uniform distribution of inhomogeneous plastic deformation (localized shear bands), together with strong interaction between shear bands in the spatially heterogeneous structure.

Keywords

AlDuctilityStrength
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2605 - 2609
Copyright
Copyright © Materials Research Society 2009

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