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

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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.

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Acknowledgment

This work was supported by the Defense Acquisition Program Administration and the Agency for Defense Development, the Global Research Laboratory Program of the Korea Ministry of Science and Technology, and the Center for Advanced Materials Processing of the 21st Century Frontier R&D Program of the Korea Ministry of Knowledge Economy. Stimulating discussions with E. Fleury, J.H. Han, K.B. Kim, S. Pauly, S. Scudino, U. Kühn, and W.T. Kim are gratefully acknowledged.

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Correspondence to Do Hyang Kim.

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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-editor-manuscripts/

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Park, J.M., Kim, D.H., Stoica, M. et al. The influence of in situ formed precipitates on the plasticity of Fe-Nb-B-Cu bulk metallic glasses. Journal of Materials Research 26, 2080–2086 (2011). https://doi.org/10.1557/jmr.2011.202

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