Multimodal discontinuous reaction in Ni-Fe-Cr-Al alloy

SCRIPTA MATERIALIA

卷:194

Article

Lech, Sebastian^1,2  Polkowski, Wojciech³  Polkowska, Adelajda³  Cempura, Grzegorz^1,2  Kruk, Adam^1,2 

[1] AGH Univ Sci & Technol, Fac Met Engn & Ind Comp Sci, Krakow, Poland

[2] Int Ctr Electron Microscopy Mat Sci, Krakow, Poland

[3] Krakow Inst Technol, Lukasiewicz Res Network, Krakow, Poland

关键词: Nickel alloys;    Analytical electron microscopy;    Diffusion-induced grain boundary motion (DIGM);    Discontinuous precipitation;   

DOI  :  10.1016/j.scriptamat.2020.113657

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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