Abstract
This paper presents scanning and transmission electron microscope investigations of the structure, phase composition, and morphology of a heat-resistant alloy modified by thermal treatment and additionally alloyed by rhenium. The rhenium alloy was obtained by using the directional crystallization technique. The structural investigations were carried out for two states of the alloy, i.e., (1) original (after the directional crystallization); (2) after the directional crystallization with 1150 °C annealing for 1 h and 1100 °C annealing for 480 h. It is shown that fcc-based γ- and γ′-phases are primary in all states of the alloy. The γ′-phase has an L12 structure, while γ-phase is a disordered phase. It was found that after directed crystallization, the volume fraction of the γ′ phase is ~85%, the fraction of the γ-phase is less than 10%. Annealing leads to an increase in the γ′- phase up to 90%, the proportion of the γ-phase practically does not change. Rhenium is a phase-formation element. The investigations show that high-temperature annealing modifies the structural and phase conditions of the heat-resistant alloy.
Highlights
The global political processes of the last century have triggered the emergence of materials used in the manufacture of the engine-related parts of jet aircrafts, i.e., superalloys
Some examples of these superalloys are those based on a mixture of γ0 - and γ-phases [1,2,3,4,5,6], where the γ-phase is a disordered fcc solid solution based on, e.g., nickel and aluminum, while the γ0 -phase is an ordered structure with an L12 superstructure [7,8,9]
Superalloys are often created on the basis of an alloy of nickel and aluminum alloyed with various refractory elements
Summary
The global political processes of the last century have triggered the emergence of materials used in the manufacture of the engine-related parts of jet aircrafts, i.e., superalloys. One of the promising directions is the development of superalloys containing intermetallic phases. Some examples of these superalloys are those based on a mixture of γ0 - and γ-phases [1,2,3,4,5,6], where the γ-phase is a disordered fcc solid solution based on, e.g., nickel and aluminum, while the γ0 -phase (in this case, Ni3 Al) is an ordered structure with an L12 superstructure [7,8,9]. Superalloys are often created on the basis of an alloy of nickel and aluminum alloyed with various refractory elements. In these modern superalloys, the γ0 -phase is the primary one. With the development and creation of superalloys, the proportion of the γ-phase in the superalloy decreases, while the proportion of the γ0 -phase increases (up to 90% or more)
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