Multi-principal element alloys are considered a promising option for high-temperature applications due to their potential for excellent oxidation resistance. However, processing conditions play a crucial role in determining the final microstructure and, consequently, the material's properties. This study examines the impact of the microstructure on the mechanical properties and high-temperature oxidation behavior of a non-equiatomic AlCrCoFeNi2.1 eutectic multi-principal element alloy. The alloy was fabricated using traditional arc melting and a powder metallurgy (PM) technique, specifically, spark plasma sintering (SPS). While the fabrication method had a minimal effect on the primary phases present, it significantly impacted the microstructure morphology. All the samples consisted primarily of a mixture of body-centered cubic and face-centered cubic phases. However, the arc-melted alloy exhibited a typical lamellar structure, whereas the SPS samples displayed globular structures in certain regions. Using a PM method significantly refined the grain size. PM routes enabled the microstructure of the samples to be tailored to improve mechanical properties and oxidation resistance. During oxidation tests, the samples fabricated using PM exhibited more homogeneous oxide layers.
AliMMAbd ElmoamenSSGepreelMAH, et al.High temperature oxidation of non equi-atomic Al5Cr12Fe35Mn28Ni20high entropy alloy. Mater Res Express2021; 8: 036508. Epub ahead of print 1 March 2021.
BasukiEAAkbarMASyabihisAA, et al.High-Temperature Oxidation Behaviour of High Entropy Alloys. In: E3S Web of Conferences. EDP Sciences, 2024.Epub ahead of print 3 July 2024. DOI: 10.1051/e3sconf/202454303001
4.
JiaXXuZHeY, et al.Oxidation behavior of CoCrFeMnNi high-entropy alloy fabricated by selective laser melting. Met Mater Int2023; 29: 2895–2908.
5.
LaplancheGVolkertUFEggelerG, et al.Oxidation behavior of the CrMnFeCoNi high-entropy alloy. Oxid Met2016; 85: 629–645.
6.
DewanganSKMangishAKumarS, et al.A review on high-temperature applicability: a milestone for high entropy alloys. JESTECH2022; 35: 101211.
7.
KumarNFuscoMKomarasamyM, et al.Understanding effect of 3.5 wt.% NaCl on the corrosion of Al0.1CoCrFeNi high-entropy alloy. J Nucl Mater2017; 495: 154–163.
8.
DingWBauerT. Progress in research and development of molten chloride salt technology for next generation concentrated solar power plants. Engineering2021; 7: 334–347.
9.
GorrBAzimMChristHJ, et al.Phase equilibria, microstructure, and high temperature oxidation resistance of novel refractory high-entropy alloys. J Alloys Compd2015; 624: 270–278.
10.
ConwayPLJKlaverTPCSteggoJ, et al.High entropy alloys towards industrial applications: high-throughput screening and experimental investigation. Mater Sci Eng A2022; 830: 142297. Epub ahead of print 7 January 2022.
11.
HuangXZhanZZhaoQ, et al.Corrosion behavior of a dual-phase FeNiCrCuAl high entropy alloy in supercritical water. Corros Sci2022; 208: 110607. Epub ahead of print 1 November 2022.
12.
Socorro-PerdomoPPFlorido-SuárezNRVoiculescuI, et al.Comparative eis study of alxcocrfeni alloys in ringer’s solution for medical instruments. Metals (Basel)2021; 11: 928. Epub ahead of print 1 June 2021.
13.
LuYGaoXJiangL, et al.Directly cast bulk eutectic and near-eutectic high entropy alloys with balanced strength and ductility in a wide temperature range. Acta Mater2017; 124: 143–150.
14.
LuYDongYGuoS, et al.A promising new class of high-temperature alloys: eutectic high-entropy alloys. Sci Rep2014; 4: 6200. Epub ahead of print 27 August 2014.
15.
AsousheMHHanzakiAZAbediHR, et al.Thermal stability, microstructure and texture evolution of thermomechanical processed AlCoCrFeNi2.1 eutectic high entropy alloy. Mater Sci Eng A2021; 799: 140012. Epub ahead of print 2 January 2021.
16.
WeiLQinW.Corrosion mechanism of eutectic high-entropy alloy induced by micro-galvanic corrosion in sulfuric acid solution. Corros Sci2022; 206: 110525. Epub ahead of print 1 September 2022.
17.
CarbajalesRSobrinoCAlvaredoP.Multi-principal element alloys for concentrating solar power based on molten salt. Sol Energy Mater Sol Cells2024; 271: 112861. Epub ahead of print 1 July 2024.
18.
LuJZhangHChenY, et al.Y-doped AlCoCrFeNi2.1 eutectic high-entropy alloy with excellent oxidation resistance and structure stability at 1000°C and 1100°C. Corros Sci2021; 180: 109191. Epub ahead of print 1 March 2021.
19.
GesmundoFGleesonB. Oxidation of multicomponent two-phase alloys. Oxid Met1995; 44: 211–237.
20.
WangGGleesonBDouglassDL. A diffusional analysis of the oxidation of binary multiphase alloys. Oxid Met1991; 35: 333–348.
21.
YehJWChenSKLinSJ, et al.Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Adv Eng Mater2004; 6: 299–303.
22.
CantorBChangITHKnightP, et al.Microstructural development in equiatomic multicomponent alloys. Mater Sci Eng A2004; 375–377: 213–218.
23.
ReverteECornideJLagosMA, et al.Microstructure evolution in a fast and ultrafast sintered non-equiatomic al/cu hea. Metals (Basel)2021; 11: 848. Epub ahead of print 1 June 2021.
24.
AlshataifYASivasankaranSFAAM, et al.Manufacturing methods, microstructural and mechanical properties evolutions of high-entropy alloys: a review. Met Mater Int2020; 26: 1099–1133.
25.
GallardoJMMontesJMSchubertT, et al.Preliminary Comparison of Hardmetals Obtained by SPS and by Electrical Resistance Sintering (ERS).
26.
GrassoSSakkaYMaizzaG.Electric current activated/assisted sintering (ECAS): a review of patents 1906-2008. Sci Technol Adv Mater2009; 10: 053001. Epub ahead of print 20 November 2009. DOI: 10.1088/1468-6996/10/5/053001.
27.
UrionabarrenetxeaEAvelloARivasA, et al.Experimental study of the influence of operational and geometric variables on the powders produced by close-coupled gas atomisation. Mater Des2021; 199: 109441. Epub ahead of print 1 February 2021.
28.
PanWFuPLiZ, et al.Microstructure and mechanical properties of AlCoCrFeNi2.1 eutectic high-entropy alloy synthesized by spark plasma sintering of gas-atomized powder. Intermetallics (Barking)2022; 144: 107523. Epub ahead of print 1 May 2022. DOI: 10.1016/j.intermet.2022.107523.
29.
GermanRM. Thermodynamic of sintering. In: FangZZ (ed.) Sintering of advanced materials. UK: Woodhead Publishing, 2010, pp.3–32.
30.
NaunheimYSchuhCA. Multicomponent alloys designed to sinter. Nat Commun2024; 15: 8028.
31.
MonchouxJP. Sintering mechanisms of metals under electric currents. In Spark plasma sintering of materials. Switzerland: Springer International Publishing, 2019, pp.93–115.
32.
TrzaskaZCoursRMonchouxJP. Densification of Ni and TiAl by SPS: kinetics and microscopic mechanisms. Metall Mater Trans A Phys Metall Mater Sci2018; 49: 4849–4859.
33.
TrzaskaZCouretAMonchouxJP. Spark plasma sintering mechanisms at the necks between TiAl powder particles. Acta Mater2016; 118: 100–108.
34.
DongHChenYZWangK, et al.Modeling remelting induced destabilization of lamellar eutectic structure in an undercooled Ni-18.7 at.% Sn eutectic alloy. J Alloys Compd2020; 826: 154018. Epub ahead of print 15 June 2020.
35.
YangJHuangYYueH, et al.Microstructure evolution and globularization mechanism of lamellar phases in Ti6.5Al2Zr1Mo1 V produced by electron beam melting. J Mater Res Technol2021; 14: 1921–1933.
36.
NassarAMullisACochraneR, et al.Rapid solidification of AlCoCrFeNi2.1 high-entropy alloy. J Alloys Compd2022; 900: 163350.
37.
MazurskiMISalishchewGA.Effect of Interface Energy Anisotropy on Thermal Stability and Transformation of Lamellar Structures Transformation of Lamellae 2. 1995.
38.
HossainRPahlevaniFQuadirMZ, et al.Stability of retained austenite in high carbon steel under compressive stress: an investigation from macro to nano scale. Sci Rep2016; 6: 34958. Epub ahead of print 11 October 2016.
39.
RuiSSHanQNWangX, et al.Correlations between two EBSD-based metrics kernel average misorientation and image quality on indicating dislocations of near-failure low alloy steels induced by tensile and cyclic deformations. Mater Today Commun2021; 27: 102245. Epub ahead of print 1 June 2021.
40.
LozinkoAZhangYMishinOV, et al.Microstructural characterization of eutectic and near-eutectic AlCoCrFeNi high-entropy alloys. J Alloys Compd2020; 822: 153558. Epub ahead of print 5 May 2020.
41.
López RíosMSocorro PerdomoPPVoiculescuI, et al.Effects of nickel content on the microstructure, microhardness and corrosion behavior of high-entropy AlCoCrFeNix alloys _ enhanced reader. Sci Rep2020; 10: 21119.
42.
HuangLSunYAmarA, et al.Microstructure evolution and mechanical properties of AlxCoCrFeNi high-entropy alloys by laser melting deposition. Vacuum2021; 183: 109875. Epub ahead of print 1 January 2021.
43.
TongCJChenYLChenSK, et al.Microstructure characterization of Al x CoCrCuFeNi high-entropy alloy system with multiprincipal elements. Metall Mater Transac A2005; 36: 881–893.
44.
SenkovONSenkovaSVWoodwardC. Effect of aluminum on the microstructure and properties of two refractory high-entropy alloys. Acta Mater2014; 68: 214–228.
45.
RittenhouseJLuebbeMHoffmanA, et al.Effect of grain refinement on high temperature steam oxidation of an FeCrAl alloy. Corros Sci2024; 226: 111688. Epub ahead of print 1 January 2024.
46.
KeRHuCZhongM, et al.Grain refinement strengthening mechanism of an austenitic stainless steel: critically analyze the impacts of grain interior and grain boundary. J Mater Res Technol2022; 17: 2999–3012.
47.
LiHShenWChenW, et al.Microstructural evolution and mechanical properties of AlCoCrFeNi high-entropy alloy joints brazed using a novel Ni-based filler. J Alloys Compd2021; 860: 157926. Epub ahead of print 15 April 2021.
48.
MaKWenHHuT, et al.Mechanical behavior and strengthening mechanisms in ultrafine grain precipitation-strengthened aluminum alloy. Acta Mater2014; 62: 141–155.
49.
LozinkoAMishinOVYuT, et al.Quantification of microstructure in a eutectic high entropy alloy AlCoCrFeNi2.1. In: IOP conference series: Materials science and engineering, paper no. 580 012039, 2019. IOP Publishing Ltd. DOI: https://doi.org/10.1088/1757-899X/580/1/012039.
50.
EsmailyMQiuYBigdeliS, et al.High-temperature oxidation behaviour of al x FeCrCoNi and AlTiVCr compositionally complex alloys. npj Mater Degrad2020; 4: 25. Epub ahead of print 2020. DOI: 10.1038/s41529-020-00129-2.
51.
GrewalHSSanjivRMAroraHS, et al.Activation energy and high temperature oxidation behavior of multi-principal element alloy. Adv Eng Mater2017; 19: 1700182. Epub ahead of print 1 November 2017.
52.
MohamedLZAbd ElMoamenSSYooSJ, et al.Oxidation of Fe35Mn21Ni20Cr12Al12 high entropy alloy in dry air. Alloys2024; 3: 43–58.
53.
MortazaviNGeersCEsmailyM, et al.Interplay of water and reactive elements in oxidation of alumina-forming alloys. Nat Mater2018; 17: 610–617.
54.
GrabkeHJStraussSVogelD. Nitridation in NH3-H2O-mixtures. Mater Corros2003; 54: 895–902.
55.
SourabhKSinghJBRavikanthKV, et al.Internal nitridation of alloy 690 during creep deformation at 1100 °C. Mater Sci Eng A2023; 867: 144719. Epub ahead of print 3 March 2023.
56.
SequeiraCAC. Nitridation 10.1 Introduction. In: High temperature corrosion: fundamentals and engineering. USA: John Wiley & Sons, Inc., 2019, pp.264–275.
57.
BradyMPGleesonBWrightIG. Alloy design strategies for promoting protective oxide-scale formation. J Miner, Met Mater Soc2000; 52: 16–21.
58.
LuoLZhangHChenY, et al.Effects of the β phase size and shape on the oxidation behavior of NiCoCrAlY coating. Corros Sci2018; 145: 262–270.
59.
ChenYZhaoXXiaoP. Effect of microstructure on early oxidation of MCrAlY coatings. Acta Mater2018; 159: 150–162.
60.
YoungDJ. Chapter 7 alloy oxidation III:multiphase scales. In: High temperature oxidation and corrosion of metals. Corrosion Series, Volume 1. Oxford, UK: Elsevier Science, 2008, pp.315–360.
61.
ChenRYouXRenK, et al.Initial oxidation behavior of AlCoCrFeNi high-entropy coating produced by atmospheric plasma spraying in the range of 650 °C to 1000 °C. Materials (Basel)2024; 17: 550. Epub ahead of print 1 February 2024.
62.
BradyMPYamamotoYSantellaML, et al.The development of alumina-forming austenitic stainless steels for high-temperature structural use. JOM2008; 60: 12–18.
63.
QiaoYWangJZhangZ, et al.Improved oxidation resistance of a new aluminum-containing austenitic stainless steel at 800 °C in air. Oxid Met2017; 88: 301–314.
