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Dislocation network in additive manufactured steel breaks strength-ductility trade-off
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 102018 (English)In: Materials Today, ISSN 1369-7021, E-ISSN 1873-4103, Vol. 21, no 4, p. 354-361Article in journal (Refereed) Published
Abstract [en]

Most mechanisms used for strengthening crystalline materials, e.g. introducing crystalline interfaces, lead to the reduction of ductility. An additive manufacturing process - selective laser melting breaks this trade-off by introducing dislocation network, which produces a stainless steel with both significantly enhanced strength and ductility. Systematic electron microscopy characterization reveals that the pre-existing dislocation network, which maintains its configuration during the entire plastic deformation, is an ideal modulator that is able to slow down but not entirely block the dislocation motion. It also promotes the formation of a high density of nano-twins during plastic deformation. This finding paves the way for developing high performance metals by tailoring the microstructure through additive manufacturing processes.

Place, publisher, year, edition, pages
2018. Vol. 21, no 4, p. 354-361
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Materials Engineering Chemical Sciences
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URN: urn:nbn:se:su:diva-157796DOI: 10.1016/j.mattod.2017.11.004ISI: 000433264200014OAI: oai:DiVA.org:su-157796DiVA, id: diva2:1235526
Available from: 2018-07-26 Created: 2018-07-26 Last updated: 2018-07-26Bibliographically approved

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Zhong, YuanZou, JiChiu, Yu-LungShen, Zhijian
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