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The influence of in situ formed precipitates on the plasticity of Fe–Nb–B–Cu bulk metallic glasses

Published online by Cambridge University Press:  01 August 2011

Jin Man Park ,
Do Hyang Kim ,
Mihai Stoica ,
Norbert Mattern ,
Ran Li  and
Jürgen Eckert
Jin Man Park
Affiliation:
Institute for Complex Materials, Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany; and Department of Metallurgical Engineering, Center for Non-Crystalline Materials, Yonsei University, Seoul 120-749, Republic of Korea
Do Hyang Kim*
Affiliation:
Department of Metallurgical Engineering, Center for Non-Crystalline Materials, Yonsei University, Seoul 120-749, Republic of Korea
Mihai Stoica
Affiliation:
Institute for Complex Materials, Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany
Norbert Mattern
Affiliation:
Institute for Complex Materials, Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany
Ran Li
Affiliation:
Department of Materials Science and Engineering, Beihang University, 100191 Beijing, China
Jürgen Eckert
Affiliation:
Institute for Complex Materials, Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany; and Institute of Materials Science, Dresden University of Technology, D-01062 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Improved room temperature plasticity was achieved by microalloying Cu in a series of (Fe71Nb6B23)100−xCux (x = 0, 0.25, 0.5, 0.75, and 1) glass matrix alloys with tunable size and volume fraction of precipitates composed of α-Fe and Fe23B6 phases. When ∼10-nm-sized nano-scale precipitates are formed with a size comparable to the shear bandwidth by controlling the added content of Cu, the (Fe71Nb6B23)99.5Cu0.5 alloy exhibits a maximum plastic strain of 4.3 ± 0.8% with pronounced multiple shear banding. A further increase in the size of the precipitates up to micrometer scale results in catastrophic fracture accompanied with irregular cracks, revealing that the fracture mechanism of the different alloys is controlled by the precipitate size.

Keywords

AmorphousCuComposite
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 16 , 28 August 2011 , pp. 2080 - 2086
Copyright
Copyright © Materials Research Society 2011

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