Multimodal discontinuous reaction in Ni-Fe-Cr-Al alloy. (15th March 2021)

• Record Type: Journal Article
• Authors: Lech, Sebastian; Polkowski, Wojciech; Polkowska, Adelajda; Cempura, Grzegorz; Kruk, Adam
• Is Part Of: Scripta materialia. Number 194(2021)
• Publication Date: 2021-03-15
• Subjects: Nickel alloys -- Analytical electron microscopy -- Diffusion-induced grain boundary motion (DIGM) -- Discontinuous precipitation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.113657
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Ni-Fe-Cr-Al alloy has been subjected to 2 hours aging treatment between 600-900°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 γ solid solution with lamellar M23 C6 carbides and elongated γ' 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. Graphical abstract: Image, graphical abstract