Synthesis, Microstructures and Mechanical Behaviour of Cr0.21Fe0.20Al0.41Cu0.18 and Cr0.14Fe0.13Al0.26Cu0.11Si0.25Zn0.11 Nanocrystallite Entropy Alloys Prepared by Mechanical Alloying and Hot-Pressing

Alshataif, Yaser A.; Sivasankaran, S.; Al-Mufadi, Fahad A.; Alaboodi, Abdulaziz S.; Ammar, Hany R.

doi:10.1007/s12540-020-00660-6

Cited by 14 publications

(5 citation statements)

References 33 publications

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“…Various parameters, namely, Gibbs free energy (ΔG mix ), enthalpy of mixing (ΔH mix ), entropy of mixing (ΔS mix ), thermodynamic parameter (Ω), atomic size deviation ( δ ), valence electron concentration (VEC), and electro-negativity (ΔX), can be used for predicting the phase formation and the phase stability of the developed HEAMCs. All parameters were calculated based on Equations (11)–(19) [ 45 , 46 ]. ΔG mix = ΔH mix − TΔS mix …”

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

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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.

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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

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“…Among the three developed HEAs, FeCrCuMnTiVZn HEA3 exhibited a higher FWHM due to the easy dissolution of low-melting Zn atoms and hence this HEA3 produced more crystallite size reduction and more lattice strain (Table 1) compared to other HEAs. The order of dissolution of atoms depends on the melting point of each incorporated element [1]. The expected dissolution series of the three developed HEAs were Cu→Mn→Fe→Ti→Cr, Cu→Mn→Fe→Ti→Cr→V, and Zn→Cu→Mn→Fe→Ti→Cr→V for FeCrCuMnTi, FeCrCuMnTiV, and FeCrCuMnTiVZn HEAs, respectively.…”

Section: Phase Evolutions and Structural Characterization Using Xrdmentioning

confidence: 99%

“…High-entropy alloys (HEAs) have recently attracted all materials scientists and materials engineers as several new alloys could be developed through this concept. HEAs exhibit extensive properties owing to the mixing of high-configurational entropy and solid solutions with severe lattice distortion which cannot be obtained by conventional alloys [1]. In conventional alloys, one metallic element acts as a major constituent (solvent atom), and the other metallic elements (solute atoms) contribute to the improvement of their properties [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The results revealed that the formation of a solid solution with BCC and FCC structures was obtained in a 25 h HEA sample. Alshataif et al [1,27] HEAs can be easily synthesized by MA without any detrimental effects as obtained from the arc melting route. Mane et al [28] synthesized CoFeNi, CoFeNiCr, CoFeNiCrMn, and CoFeNiCrMnAl alloys and studied the densification rate with an increase in the number of elements during non-isothermal sintering.…”

Section: Introductionmentioning

confidence: 99%

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Influence of V and Zn in FeCrCuMnTi High-Entropy Alloys on Microstructures and Uniaxial Compaction Behavior Prepared by Mechanical Alloying

2021

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The densification behavior of FeCrCuMnTi (HEA1), FeCrCuMnTiV (HEA2), and FeCrCuMnTiVZn (HEA3) equiatomic high-entropy alloys (HEAs) was explored using different uniaxial quasi-static controlled compaction (1 mm/min). These HEAs were synthesized by mechanical alloying (MA, speed: 300 rpm, BPR: 10:1, time: 25 h). Various phase formations, structural characteristics (crystallite size, lattice strain, and lattice constant), thermo-dynamic calculations, powder surface morphologies, detailed microstructural evolutions, and chemical compositions were examined using X-ray diffraction, high-resolution scanning electron microscopy, and high-resolution transmission electron microscopy. The XRD results revealed the formation of multiple solid solutions (FCC, BCC, and HCP) due to the variation in entropy, and the presence of high-strength elements (Cr, Ti, and V) in the developed HEA alloys. The synthesized powders were consolidated into bulk green samples with different compaction pressures starting from 25 to 1100 MPa under as-milled and milled under stress recovery conditions (150 °C, 1 h). The incorporation of V in the FeCrCuMnTi HEA resulted in improved densification due to a greater reduction in particle size, and high configurational entropy. Furthermore, the stress-recovered powder samples produced more relative density owing to the elimination of lattice strain. Several linear and non-linear compaction models were applied to predict densification behavior. The non-linear Cooper and Eaton model produced the highest regression coefficients compared to the other models.

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“…The sintering process is one of the methods of producing parts from various types of metal, ceramic and composite powders [15]. Sintering can be done in different ways such as sintering inside a furnace [16], microwave sintering [17], hot press [18], spark plasma sintering (SPS), etc. [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of a novel Fe-based nanocomposite by mechanical alloying and spark plasma sintering

2021

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To improve low hardness and poor corrosion resistance of the Fe-based alloys, Fe-Ti-Al-B-Si-C-P-Cr novel alloy was prepared using mechanical alloying and spark plasma sintering (SPS). Two types of mills, including of high-energy planetary (HEP) and SPEX(S) ball mills (BM) were used to reach the solid solution. Mechanical alloying by the HEP route led to the formation of the Fe(α) phase after 60 h, while its milling after 15 h by high-energy SPEX mill led to the formation of the Fe(α) solid solution. After sintering of as-milled powders by SPS, the composite of Fe (α)/nanocrystalline was obtained. The micro-hardness of the HEP-SPS and the S-SPS samples obtained about 689.5 ± 0.15 and 2068.5 ± 0.18 HV 0.3 , respectively. The lowest corrosion current density and the highest polarization resistance were related to the HEP-SPS sample and was calculated to be 0.51 µA/cm 2 and 41.668 KHz/cm 2 , respectively.

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Synthesis, Microstructures and Mechanical Behaviour of Cr0.21Fe0.20Al0.41Cu0.18 and Cr0.14Fe0.13Al0.26Cu0.11Si0.25Zn0.11 Nanocrystallite Entropy Alloys Prepared by Mechanical Alloying and Hot-Pressing

Cited by 14 publications

References 33 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

Influence of V and Zn in FeCrCuMnTi High-Entropy Alloys on Microstructures and Uniaxial Compaction Behavior Prepared by Mechanical Alloying

Synthesis and characterisation of a novel Fe-based nanocomposite by mechanical alloying and spark plasma sintering

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