The structure of heat-resisting alloy modified by thermal treatment and alloyed by rhenium and lanthanum

International Conference and Youth Scientific School on "Materials and Technologies of New Generations in Modern Materials Science"

Kozlov, E.V.^1 ; Popova, N.A.^1 ; Nikonenko, E.L.^1,2 ; Kondratyuk, A.A.^2 ; Kuznetsov, M.E.^1 ; Klopotov, A.A.^1,3

Tomsk State University of Architecture and Building, Solyanaya Sq., 2, Tomsk

634003, Russia^1

National Research Tomsk Polytechnic University, Lenin Ave., 30, Tomsk

634050, Russia^2

National Research Tomsk State University, Lenin Ave., 36, Tomsk

634050, Russia^3

关键词: Directional crystallization;    Disordered phase;    Heat-resisting alloys;    High-temperature annealing;    Phase conditions;    Phase forming;    Scanning and transmission electron microscopes;    Structural investigation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/156/1/012036/pdf
DOI  :  10.1088/1757-899X/156/1/012036

来源: IOP

【 摘 要 】

The paper presents the scanning and transmission electron microscope investigations of the structure, phase composition, and morphology of heat-resisting alloy modified by thermal treatment and additionally alloyed by rhenium and lanthanum. Rhenium alloy is obtained by the directional crystallization technique. The structural investigations are carried out for three alloy states, i.e. 1) original (after the directional crystallization); 2) 1150°C annealing during 1 h and 1100°C annealing during 480 h; 3) 1150°C annealing during 1 h and 1100°C annealing during 1430 h. It is shown that fcc-based γ- and γ'-phases are primary in all states of the alloy. γ'-phase has L12 structure, while γ-phase is a disordered phase. Rhenium and lanthanum are phase-forming elements. Investigations show that high-temperature annealing modifies the structural and phase conditions of the heat-resisting alloy.