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Precipitation and fracture behaviour of Fe-Mn-Ni-Al alloys

The effects of Al addition on the precipitation and fracture behaviour of Fe-Mn-Ni alloys were investigated. With the increasing of Al concentration, the matrix and grain boundary precipitates changed from L1 0 θ-MnNi to B2 Ni 2 MnAl phase, which is coherent and in cube-to-cube orientation relations...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2013-12, Vol.93 (36), p.4519-4531
Main Authors: Heo, Yoon-Uk, Lee, Hu-Chul
Format: Article
Language:English
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Summary:The effects of Al addition on the precipitation and fracture behaviour of Fe-Mn-Ni alloys were investigated. With the increasing of Al concentration, the matrix and grain boundary precipitates changed from L1 0 θ-MnNi to B2 Ni 2 MnAl phase, which is coherent and in cube-to-cube orientation relationship with the α′-matrix. Due to the suppression of the θ-MnNi precipitates at prior austenite grain boundaries (PAGBs), the fracture mode changed from intergranular to transgranular cleavage fracture. Further addition of Al resulted in the discontinuous growth of Ni 2 MnAl precipitates in the alloy containing 4.2 wt.% Al and fracture occurred by void growth and coalescence, i.e. by ductile dimple rupture. The transition of the fracture behaviour of the Fe-Mn-Ni-Al alloys is discussed in relation to the conversion of the precipitates and their discontinuous precipitation behaviour at PAGBs.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2013.834388