Structure-property relationships in hot forged AlxCoCrFeNi high entropy alloys

Sourav, Ayush; Yebaji, Sushil; Shanmugasundaram, T.

doi:10.1016/j.msea.2020.139877

Cited by 45 publications

(9 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed grain size started to decrease with the increase in Al 2 O 3 particles owing to the solid solution formation, dislocation pinning by Al 2 O 3 particles, high-configurational entropy, and structural refinement of MA and hot-forging processes. In addition, the observed matrix grain size was almost equiaxed in shape, indicating an isotropic nature [ 50 ]. The grain size distribution of the CrFeCuMnNi matrix based on the EBSD microstructures over the area fraction was determined and is shown in Figure 12 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Al2O3 (x = 0, 1, 2, and 3 vol.%) in CrFeCuMnNi-x High-Entropy Alloy Matrix Composites on Their Microstructure and Mechanical and Wear Performance

et al. 2023

View full text Add to dashboard Cite

This work aims to study the influence of Al2O3 in CrFeCuMnNi high-entropy alloy matrix composites (HEMCs) on their microstructure, phase changes, and mechanical and wear performances. CrFeCuMnNi-Al2O3 HEMCs were synthesized via mechanical alloying (MA) followed by hot compaction (550 °C at 550 MPa), medium frequency sintering (1200 °C), and hot forging (1000 °C at 50 MPa). The XRD results demonstrate the formation of both FCC and BCC phases in the synthesized powders, which were transformed into major stable FCC and minor ordered B2-BCC phases, as confirmed by HRSEM. The microstructural variation of HRSEM-EBSD, in terms of the coloured grain map (inverse pole figures), grain size distribution, and misorientation angle, was analysed and reported. The grain size of the matrix decreased with the increase in Al2O3 particles owing to the higher structural refinement by MA and zener pinning of the incorporated Al2O3 particles. The hot-forged CrFeCuMnNi-3 vol.% Al2O3 sample exhibited an ultimate compressive strength of 1.058 GPa, which was 21% higher than that of the unreinforced HEA matrix. Both the mechanical and wear performance of the bulk samples increased with an increase in Al2O3 content due to solid solution formation, high configurational mixing entropy, structural refinement, and the effective dispersion of the incorporated Al2O3 particles. The wear rate and coefficient of friction values decreased with the increase in Al2O3 content, indicating an improvement in wear resistance owing to the lower domination of abrasive and adhesive mechanisms, as evidenced by the SEM worn surface morphology.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Al2O3 (x = 0, 1, 2, and 3 vol.%) in CrFeCuMnNi-x High-Entropy Alloy Matrix Composites on Their Microstructure and Mechanical and Wear Performance

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The tensile strength of CoCrFeNi has reduced from 593 to 518 MPa after welding. Twins are known to act as a barrier to the movement of dislocations [28]. The absence of twins and larger grain size in WZ causes a reduction in strength in laser-welded CoCrFeNi alloy.…”

Section: Resultsmentioning

confidence: 99%

Effect of copper on microstructural evolution and mechanical properties of laser-welded CoCrFeNi high entropy alloy

Verma

Natu²,

Balasundar

et al. 2022

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

In this work, laser welding of CoCrFeNi and CoCrCuFeNi HEA was carried out. X-ray diffraction, electron backscattered diffraction, mechanical property and microstructural analyses were performed. In CoCrFeNi alloy, a face centred cubic (FCC) structure was observed in both base metal and laser-welded conditions. The addition of Cu in CoCrFeNi alloy is resulted in two FCC phases and has increased the tensile strength from 593 to 666 MPa. The fusion zone of both the welds shows coarser columnar grain and lower hardness compared to that of base metals. Post-welding results show 53% decrease in tensile strength in the alloy containing Cu (CoCrFeNiCu). Whereas only a marginal decrease in strength is observed in CoCrFeNi alloy.

show abstract

“…Properties of dual‐phase HEAs are often determined using the rule of mixtures. [ 39,40 ] For the first time, this work demonstrates the approach to predict phase fraction quantitatively using the aforementioned empirical and thermodynamic parameters.…”

Section: Discussionmentioning

confidence: 99%

“…However, there are contradictions to the phase fraction reported in the literature. [27,29,[37][38][39] Therefore, a series of Al x CoCrFeNi (x ¼ 0.3, 0.5, 0.7) alloys was synthesized and characterized by using XRD and EBSD to estimate the FCC/ BCC phase fraction of this alloy system. Figure 3 shows XRD patterns of the homogenized Al x CoCrFeNi (x ¼ 0.3, 0.5, 0.7) alloys.…”

Section: Experimental Validation Of Phase Fraction In Al X Cocrfenimentioning

confidence: 99%

Quantitative Phase Prediction in Dual‐Phase High‐Entropy Alloys: Computationally Aided Parametric Approach

Negi

Sourav

Heilmaier

et al. 2021

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

Dual‐phase high‐entropy alloys (HEAs) have shown remarkable mechanical properties. However, type and fraction of the secondary phase play a significant role in determining their physical and mechanical properties. CALPHAD is generally used to predict the phases and their fraction in HEAs. Herein, a parameter‐based empirical model is used to predict the phase fraction in dual‐phase HEAs. Valence electron concentration and various measures of atomic size mismatch are utilized for that purpose. A new parameter, namely, critical mismatch factor (δnormalC), is proposed in this work. Experimental verification is done on a series of AlxCoCrFeNi (x = 0.3, 0.5, 0.7) alloys synthesized by vacuum arc melting. Phase fraction is determined by X‐ray diffraction and electron backscatter diffraction analysis. The experimentally determined volume fraction of BCC phase in Al0.3, Al0.5, and Al0.7 is 0%, 6%, and 28–37%, respectively, which agrees closely with the predicted values proving the chosen approach useful.

show abstract

Structure-property relationships in hot forged AlxCoCrFeNi high entropy alloys

Cited by 45 publications

References 54 publications

Effect of Al2O3 (x = 0, 1, 2, and 3 vol.%) in CrFeCuMnNi-x High-Entropy Alloy Matrix Composites on Their Microstructure and Mechanical and Wear Performance

Effect of Al2O3 (x = 0, 1, 2, and 3 vol.%) in CrFeCuMnNi-x High-Entropy Alloy Matrix Composites on Their Microstructure and Mechanical and Wear Performance

Effect of copper on microstructural evolution and mechanical properties of laser-welded CoCrFeNi high entropy alloy

Quantitative Phase Prediction in Dual‐Phase High‐Entropy Alloys: Computationally Aided Parametric Approach

Contact Info

Product

Resources

About