Phase stability and sigma (σ)-phase precipitation kinetics in a new wrought CrCoNi-based medium-entropy superalloy

This data set contains:

Figure 1 - Two backscatter electron (BSE) images of two microstructural states of the superalloy used for EDX analyses. Both alloys were annealed at 930°C for 900h starting with either a solution annealed + precipitation-hardened state (SA+PH) or a solution annealed + cold-rolled state (SA+CR). Each file in this dataset is named as follows: Alloy name_Initial heat treatment state_Temperature of annealing_Duration of annealing.

Figure 2 - Montage of 176 BSE images of a superalloy (in the SA+PH state) aged at 930°C for 3000h. This montage was used to segment the bright σ-phase.

Figure 3 - BSE image centered on a single grain of a superalloy aged at 930°C for 3000h. This BSE micrograph was used to segment the γ’-phase.

Figure 4 - This folder contains an Origin file (.opju) with the element concentrations at the γ/γ’-interfaces of the precipitation-hardened (SA+PH) state, obtained by APT measurements. Additionally, the isoconcentration profile obtained at 52at.% Ni is given as a (.tif) file.

Figure 5 - Origin file (.opju) of thermodynamic calculations (ThermoCalc / TCNI10) and experimental data of the volume percentages of the main phases.

Figure 6 - Origin file (.opju) of the EDX point measurements and thermodynamic calculations. This file is subdevided into folders for each phase and calculation.

Figure 7 - BSE images (.tif) of distinct locations of the microstructure within the superalloy aged at 950°C for 100h , illustrating the different morphologies of the σ-phase depending on the nucleation site: The file name format is: Alloy name_Initial heat treatment state_Temperature of annealing_Duration of annealing_Location.

Figure 8 - BSE images (.tif) of the isothermally aged SA+PH superalloy. The folder is organized in nine subfolders for each aging temperature.

Figure 9 - BSE images of the SA+PH superalloy aged at 930°C for durations between 10 and 100h to illustrate the development of hard impingement events of σ-discs within grains.

Figure 10 - Origin file (.opju) of the thickening and lengthening kinetics of σ-allotriomorphs.

Figure 11 - Origin file (.opju) of the σ-phase precipitation kinetics within grains and lengthening kinetics of σ-discs.

Figure 12 - Origin file (.opju) of data used to determine grain-size dependent TTT diagrams.

Data sets of the supplementary materials:

Figure S1 - TEM image and diffration pattern of the superalloy in the SA+PH state.

Figure S2 - Origin file (.opju) of APT / Partitioning data of the superalloy in the SA+PH state.

Figure S3 - Origin file (.opju) of an X-ray diffraction pattern of the SA+PH superalloy after aging at 870°C for 3000h.

Figure S4 - EBSD scans (as .ctf data set) of σ-precipitates in the superalloy aged at 930°C for 3000h.

Figure S5 - Origin file (.opju) of the overall σ-phase precipitation kinetics.