Journal
SCRIPTA MATERIALIA
Volume 194, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.113657
Keywords
Nickel alloys; Analytical electron microscopy; Diffusion-induced grain boundary motion (DIGM); Discontinuous precipitation
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Funding
- AGH statutory project [16.16.110.663]
- European Union's Horizon 2020 Research and Innovation Program [823717]
- Polish National Science Centre [MINIATURA 3 -2019/03/X/ST5/00758, SONATA 12-UMO-2016/23/D/ST8/01269]
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The study of Ni-Fe-Cr-Al alloy revealed the presence of three different phases in the discontinuous precipitation zone, as well as discussed the development of multiple discontinuous reactions.
Ni-Fe-Cr-Al alloy has been subjected to 2 hours aging treatment between 600-900 degrees C, which influenced the mechanical properties and resulted in discontinuous precipitation at the grain boundaries. In this study, SEM, TEM and STEM-EDXS were applied to explore the relationship between the occurring grain boundary precipitation phenomena and mechanical behavior. Within the discontinuous precipitation zone, three different phases were recognized, namely gamma solid solution with lamellar M23C6 carbides and elongated gamma' precipitates at the reaction front. Coherency of the discontinuous precipitates was identified as they have shown a cube-on-cube orientation relationship. Furthermore, the development of multiple discontinuous reactions was discussed. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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