This work presented an upgraded high-entropy alloy by the addition of chromium to the conventional Ti-10V-2Fe-3Al alloy to fabricate equiatomic Ti20V20Al20Fe20Cr20 high-entropy alloy via spark plasma sintering powder processing at different temperature of 700 °C, 800 °C, 900 °C, 1000 °C, and 1100 °C respectively under a constant heating rate of 100 °C /min, the pressure of 40 MPa, and holding time of 5 min. The microstructure and phase transformation of the sintered alloyed were studied with a scanning electron microscope equipped with energy dispersive spectroscopy. The constituent phases present in the sintered high-entropy alloy were analyzed by X-ray diffraction and were found to show increased development of body-centered cubic solid solution alloys across the temperature gradients. The mechanical properties over a temperature range of 700 ≤ T °C ≤ 1100 generally show an increase in hardness from 3363 to 8480 MPa, tensile strength from 1097.17 to 2766.58 MPa, and yield strength from793.61 to 2001.13 MPa respectively. The SEM-EDS of Ti20V20Al20Fe20Cr20 equiatomic high-entropy alloys show the existence of a nano-net-like spinodal structure at the optimum temperature of 1100 °C, which are rich in body centered cubic structure. At this elevated temperature, the presence of strong body-centered cubic–forming elements such as Cr, Fe, and Al was established from the corresponding EDS. Ti20V20Al20Fe20Cr20 high-entropy equiatomic alloy has been successfully fabricated by spark plasma sintering. The effects of temperature on microstructural and mechanical properties of the sintered Ti20V20Al20Fe20Cr20 alloy demonstrated a general improvement of the alloys at the elevated region.
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Ladenberger L et al. (2017) Validation of the ABZ landing gear system using ProB. 19(2): p. 187-203
Murty BS et al. (2019) High-entropy alloys. : Elsevier
Aristeidakis IS, Tzini M-IT, P.J.H.E.A. (2016) Metallurgy, High entropy alloys
Yeh JW et al. (2004) Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. . 6(5): p. 299-303
Tung C-C et al. (2007) On the elemental effect of AlCoCrCuFeNi high-entropy alloy system.. 61(1): p. 1-5
Zhang Y et al. (2014) Guidelines in predicting phase formation of high-entropy alloys. . 4(2): p. 57-62
Ji W et al. (2015) Alloying behavior and novel properties of CoCrFeNiMn high-entropy alloy fabricated by mechanical alloying and spark plasma sintering. . 56: p. 24-27
Joo S-H et al. (2017) Tensile deformation behavior and deformation twinning of an equimolar CoCrFeMnNi high-entropy alloy. 689: p. 122-133
Senkov O, Miracle DB (2016) A new thermodynamic parameter to predict formation of solid solution or intermetallic phases in high entropy alloys. J Alloys Compd 658:603–607
Zhang W, Liaw PK, Zhang Y (2018) Science and technology in high-entropy alloys. Sci China Mater 61(1):2–22
Gludovatz B et al. (2014) A fracture-resistant high-entropy alloy for cryogenic applications. 345(6201): p. 1153-1158
Fang S et al. (2014) Microstructure and mechanical properties of twinned Al0. 5CrFeNiCo0.3C0.2 high entropy alloy processed by mechanical alloying and spark plasma sintering. 54: p. 973-979
Pan J et al. (2018) Microstructure and mechanical properties of Nb25Mo25Ta25W25 and Ti8Nb23Mo23Ta23W23 high entropy alloys prepared by mechanical alloying and spark plasma sintering. 738: p. 362-366
Mohanty S et al. (2017) Powder metallurgical processing of equiatomic AlCoCrFeNi high entropy alloy: microstructure and mechanical properties. 679: p. 299-313
Cahoon J, Broughton W, Kutzak AR (1971) The determination of yield strength from hardness measurements. Metall Trans 2(7):1979–1983
Huang H et al. (2017) Phase-transformation ductilization of brittle high-entropy alloys via metastability engineering. 29(30): p. 1701678
Guo S et al. (2011) Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys. 109(10): p. 103505.
Senkov O, Woodward C, Miracle DB (2014) Microstructure and properties of aluminum-containing refractory high-entropy alloys. JOM 66(10):2030–2042
Alcalá M et al. (2018) Effects of milling time, sintering temperature, Al content on the chemical nature, microhardness and microstructure of mechanochemically synthesized FeCoNiCrMn high entropy alloy. 749: p. 834-843
Yuan Y et al. (2012) Microstructure control and corrosion properties of AlCoCrFeNiTi0. 5 high-entropy alloy. 5
Wang W-R et al. (2014) Phases, microstructure and mechanical properties of AlxCoCrFeNi high-entropy alloys at elevated temperatures. 589: p. 143-152
Wang Y et al. (2013) Optimizing mechanical properties of AlCoCrFeNiTi x high-entropy alloys by tailoring microstructures. 26(3): p. 277-284
Pickering E, Jones NR (2016) High-entropy alloys: a critical assessment of their founding principles and future prospects. J Int Mater Rev 61(3):183–202
Jiao Z et al. (2016) Superior mechanical properties of AlCoCrFeNiTi x high-entropy alloys upon dynamic loading. 25(2): p. 451-456
Hart M (1969) High precision lattice parameter measurements by multiple Bragg reflexion diffractometry. Proc R Soc Lond A Math Phys Sci 309(1497):281–296
Praveen S, Murty B, Kottada RS (2013) Phase evolution and densification behavior of nanocrystalline multicomponent high entropy alloys during spark plasma sintering. JOM 65(12):1797–1804
Gao MC et al. (2017) Thermodynamics of concentrated solid solution alloys. 21(5): p. 238-251
Pi J et al. (2019) Effect of cold deformation and heat treatment on the microstructure and mechanical behavior of high entropy alloy CuCrFeNi2Al0.5. 28(1): p. 586-592
Zhisheng N et al. (2018) Thermal stability of AlCrFeNiTi high entropy alloy [J]. 47(01): p. 191-196
Zhang J.J.D.U.o.T. (2013) The microstructure and performance of high-entropy alloys Alx CoCrFeNiTi0.5 [D]
Chen J et al. (2018) Effect of sintering temperature on mechanical properties and microstructure OF FeAlCoCrNiTi0.5 alloy. (4): p. 56
The authors wish to express gratitude to Tshwane University of Technology, Pretoria, South Africa, for the financial and logistic supports provided during this work.
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Afolabi, A.E., Popoola, O., Popoola, A.P.I. et al. Temperature effects on microstructure and mechanical properties of sintered high-entropy equiatomic Ti20V20Al20Fe20Cr20 alloy for aero-gear application. Int J Adv Manuf Technol 108, 3563–3570 (2020). https://doi.org/10.1007/s00170-020-05501-9
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