Phase composition of heat-resisting alloy modified by ageing and alloyed by rhenium

Nina Koneva, Elena Nikonenko, Natalya Popova, Ivan Gibert, Eduard Kozlov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper presents the transmission electron microscope (TEM) investigations of the structure of Ni-Al-Cr-based superalloy which is obtained by directional crystallization technique. The structural TEM investigations are carried out in two stages: 1) annealing at 1150°C for 1 h and 2) annealing at 1100°C for 480 h. The qualitative and quantitative analysis is given for the structure, phase composition and morphology of heat-resisting alloy additionally alloyed by rhenium Re both in the original state and after thermal treatment. The heat-resisting alloy comprises ∼70 at % Ni, ∼17 at % Al and ∼5 at % Cr. The total amount of the primary alloying elements of Mo, W, Ta, Ti, Co, La was ∼7 at % and 0.4 at % Re. It is shown that the structure of the superalloy is represented by (γ + γ′)-phase mixture which has a morphologically correct crystallographic orientation and quasi-monocrystalline structure. σ-phase is formed in this superalloy due to rhenium. Since Re distribution in the alloy is not uniform, only a part of (γ + γ′)-phase quasi-cuboids is distorted. It is shown that Re modification distorts the ideal structure of (γ + γ′)-phase quasi-cuboids and results in the formation of β-, χ-and σ-phases.

Original languageEnglish
Title of host publicationAdvanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016
Subtitle of host publicationProceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016
PublisherAmerican Institute of Physics Inc.
Volume1783
ISBN (Electronic)9780735414457
DOIs
Publication statusPublished - 10 Nov 2016
EventInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016 - Tomsk, Russian Federation
Duration: 19 Sep 201623 Sep 2016

Conference

ConferenceInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016
CountryRussian Federation
CityTomsk
Period19.9.1623.9.16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Koneva, N., Nikonenko, E., Popova, N., Gibert, I., & Kozlov, E. (2016). Phase composition of heat-resisting alloy modified by ageing and alloyed by rhenium. In Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016 (Vol. 1783). [020096] American Institute of Physics Inc.. https://doi.org/10.1063/1.4966389