Partial substitution of Mn by Al in the CoCrFeNiMnXAl20-X (X=5, 10, 15) high entropy alloy prepared of mechanical alloying and spark plasma sintering

The dataset was used and is a supplement to the article "Partial substitution of Mn by Al in the CoCrFeNiMnXAl20-X (X=5, 10, 15) high entropy alloy prepared by mechanical alloying and spark plasma sintering". DOI: 10.21062/mft.2022.045.

The dataset includes results related to the basic characterization of CoCrFeNiMnXAl20-X (X=5, 10, 15) alloys prepared by powder metallurgy methods. Specifically, these are the results of chemical and phase composition analyses, as well as microstructure images from optical and scanning electron microscopy observations. Furthermore, the results of mechanical properties from compressive tests and HV 1 hardness measurements are included.

Naming convention

- for chemical composition: Alloy_XRF.txt

- for phase composition: Alloy_XRD.txt

- for microstructure images: Alloy_Preparation_Method_Magniffication.tiff (Preparation = MA/MA+SPS; Method = OM/SEM)

- for compressive tests results: Alloy_testX.csv (X is number of test)

- for hardness: Alloy_HV 1.txt

Preparation

All prepared alloys (CoCrFeNiMnXAl20-X (X=5, 10, 15)) were prepared via mechanical alloying (MA) and spark plasma sintering (SPS). The conditions for these processes are listed below.

MA - Retsch PM 100; milling jar - AISI 420; rotation speed 400 rpm; time 8 h; interval 30 min + breaktime 10 min; Ar atmosphere.

SPS - FCT Systeme HP D 10; speed of heating 200 °C/min; temperature 1000 °C; pressure 48 MPa; time 10 min; vacuum.

Experiment

The characterization of the materials consisted of analyses of chemical composition (XRF, X-ray fluorescence), phase composition (XRD, X-ray diffraction), microstructure (OM-optical/SEM-scanning electron microscopy) and compressive tests and HV 1 hardness measurements were also performed. Detailed information on the analyses is provided below.

Chemical composition (XRF)

The chemical composition was determined using the X-ray fluorescence - ARL XP 2400. Results were optimized to a total value of 100 hm. % and were saved in a .txt file, which also includes a detailed device setup.

Phase Composition (XRD)

The chemical composition was determined using the X-ray diffraction - PANalytical X'Pert Pro MPD. The Co cathode with a wavelenght of 1.78901x10^(-10) m was used for the measurement. The results were exported as intensity (I) versus position (2Theta) in an .txt file.

Microstructure

The microstructure of the prepared powders (MA) and compacts (MA+SPS) were observed on the metallographic cross-sections, which were ground on SiC abrasive papers and polishing on polycrystalline diamond suspensions with particle sizes 3 and 1 μm. Furthermore, the cross-sections were etched in aqua regia (HNO3 and HCl mixed in a ratio of 3:1) diluted with distilled H2O in a ratio of 1:1. The microstructure was observed using optical microscope Nikon Eclipse MA 200 (OM) and scanning electron microscope Tescan Lyra 3 (SEM). All images in .tiff format include scales and in the case of SEM images, an additional table with observation parameters is also included. All images were converted to grayscale mode 16 Bits/Chanel with a resolution of 300 pixels/inch using Adobe Photoshop CS2.

Compressive tests

The mechanical properties of the alloys were determined using the compressive stress-strain testing performed on the universal testing device LabTest 5.250SP1-VM with a strain speed of 0.001 s-1. For this purpose, quadrangular pris-matic samples, having a height of 1.5x the size of the base, were used. Other measurement conditions corresponded to DIN 50 106 and the results are included in the .csv file.

Hardness - HV 1

The compacts were examined using the Future-Tech FM-700 hardness measuring device for Vickers hardness using a 1 kg load with a dwell time 10 s. The measurement was performed a total of ten times for each material and the results were saved in .txt file.