Enhanced cavitation erosion resistance of a friction stir processed high entropy alloy

Abstract

Friction stir processing of an Al_0.1CoCrFeNi high entropy alloy (HEA) was performed at controlled cooling conditions (ambient and liquid submerged). Microstructural and mechanical characterization of the processed and as-cast HEAs was evaluated using electron backscat-ter diffraction, micro-hardness testing and nanoindentation. HEA under the submerged cooling condition showed elongated grains (10 µm) with fine equiaxed grains (2 µm) along the boundary compared to the coarser grain (∼2 mm) of as-cast HEA. The hardness showed remarkable improvements with four (submerged cooling condition) and three (ambient cooling condition) times that of as-cast HEA (HV ∼150). The enhanced hardness is attributed to the significant grain refinement in the processed HEAs. Cavitation erosion behavior was observed for samples using an ultrasonication method. All of the HEAs showed better cavitation erosion resistance than the stainless steel 316L. The sample processed under a submerged liquid condition showed approximately 20 and 2 times greater erosion resistance than stainless steel 316L and as-cast HEA, respectively. The enhanced erosion resistances of the processed HEAs correlate to their increased hardness, resistance to plasticity, and better yield strength than the as-cast HEA. The surface of the tested samples showed nucleation and pit growth, and plastic deformation of the material followed by fatigue-controlled disintegration as the primary material removal mechanism.

Keywords

cavitation erosion / microstructure / mechanical properties / surface engineering

References

[1] Franc JP, Michel JM. Thess A. Fundamentals of cavitation. Fluid Mechanics and Its Applications, 2005, Netherlands, Springer

[2] Grewal HS, Agrawal A, Singh H, Arora HS. Cavitation erosion studies on friction stir processed hydroturbine steel. Trans. Indian Inst. Met., 2012, 65(6): 731.

[3] Stachowiak GW, Batchelor AW. Engineering Tribology, 2013, 4th ed., Oxford, Butterworth-Heinemann

[4] Tsai MH, Yeh JW. High-entropy alloys: A critical review. Mater. Res. Lett., 2014, 2(3): 107.

[5] Murty BS, Yeh JW, Ranganathan S. High-Entropy Alloys, 2014, 1st ed., Oxford, Butterworth-Heinemann

[6] Miracle DB, Senkov ON. A critical review of high entropy alloys and related concepts. Acta Mater., 2017, 122, 448.

[7] Cantor B, Chang ITH, Knight P, Vincent AJB. Micro-structural development in equiatomic multicomponent alloys. Mater. Sci. Eng. A, 2004, 375–377, 213.

[8] Yeh JW, Chen SK, Lin SJ, Gan JY, Chin TS, Shun TT, Tsau CH, Chang SY. Nanostructured high-entropy alloys with multiple principal elements: Novel alloy design concepts and outcomes. Adv. Eng. Mater., 2004, 6(5): 299.

[9] Tsai MH. Physical properties of high entropy alloys. Entropy, 2013, 15(12): 5338.

[10] Yu PF, Cheng H, Zhang LJ, Zhang H, Jing Q, Ma MZ, Liaw PK, Li G, Liu RP. Effects of high pressure torsion on microstructures and properties of an Al_0.1CoCrFeNi high-entropy alloy. Mater. Sci. Eng. A, 2016, 655, 283.

[11] Wu SW, Wang G, Yi J, Jia YD, Hussain I, Zhai QJ, Liaw PK. Strong grain-size effect on deformation twinning of an Al_0.1CoCrFeNi high-entropy alloy. Mater. Res. Lett., 2017, 5(4): 276.

[12] Shi YZ, Yang B, Xie X, Brechtl J, Dahmen KA, Liaw PK. Corrosion of AL_xCoCrFeNi high-entropy alloys: Al-content and potential scan-rate dependent pitting behavior. Corros. Sci., 2017, 119, 33.

[13] Lee CP, Chang CC, Chen YY, Yeh JW, Shih HC. Effect of the aluminium content of Al_xCrFe_1.5MnNi_0.5 high-entropy alloys on the corrosion behaviour in aqueous environments. Corros. Sci., 2008, 50(7): 2053.

[14] Zhao JH, Ji XL, Shan YP, Fu Y, Yao Z. On the micro-structure and erosion-corrosion resistance of AlCrFeCoNiCu high-entropy alloy via annealing treatment. Mater. Sci. Technol., 2016, 32(12): 1271.

[15] Nair RB, Selvam K, Arora HS, Mukherjee S, Singh H, Grewal HS. Slurry erosion behavior of high entropy alloys. Wear, 2017, 386–387, 230.

[16] Nair RB, Arora HS, Mukherjee S, Singh S, Singh H, Grewal HS. Exceptionally high cavitation erosion and corrosion resistance of a high entropy alloy. Ultrason. Sonochem., 2018, 41, 252.

[17] Wu CL, Zhang S, Zhang CH, Zhang H, Dong SY. Phase evolution and cavitation erosion-corrosion behavior of FeCoCrAlNiTi_x high entropy alloy coatings on 304 stainless steel by laser surface alloying. J. Alloys Compd., 2017, 698, 761.

[18] Toma D, Brandl W, Marginean G. Wear and corrosion behaviour of thermally sprayed cermet coatings. Surf. Coat. Technol., 2001, 138(2–3): 149.

[19] Choy KL. Chemical vapour deposition of coatings. Prog. Mater. Sci., 2003, 48(2): 57.

[20] Souza VAD, Neville A. Aspects of microstructure on the synergy and overall material loss of thermal spray coatings in erosion—corrosion environments. Wear, 2007, 263(1–6): 339.

[21] Grewal HS, Arora HS, Singh H, Agrawal A. Surface modification of hydroturbine steel using friction stir processing. Appl. Surf. Sci., 2013, 268, 547.

[22] Charit I, Mishra RS. High strain rate superplasticity in a commercial 2024 Al alloy via friction stir processing. Mater. Sci. Eng. A, 2003, 359(1–2): 290.

[23] Escobar JD, Velásquez E, Santos TFA, Ramirez AJ, López D. Improvement of cavitation erosion resistance of a duplex stainless steel through friction stir processing (FSP). Wear, 2013, 297(1–2): 998.

[24] Hajian M, Abdollah-zadeh A, Rezaei-Nejad SS, Assadi H, Hadavi SMM, Chung K, Shokouhimehr M. Microstructure and mechanical properties of friction stir processed AISI 316L stainless steel. Mater. Des., 2015, 67, 82.

[25] Hajian M, Abdollah-zadeh A, Rezaei-Nejad SS, Assadi H, Hadavi SMM, Chung K, Shokouhimehr M. Improvement in cavitation erosion resistance of AISI 316L stainless steel by friction stir processing. Appl. Surf. Sci., 2014, 308, 184.

[26] Kumar N, Komarasamy M, Nelaturu P, Tang Z, Liaw PK, Mishra RS. Friction stir processing of a high entropy alloy Al_0.1CoCrFeNi. JOM, 2015, 67(5): 1007.

[27] Komarasamy M, Kumar N, Tang Z, Mishra RS, Liaw PK. Effect of microstructure on the deformation mechanism of friction stir-processed Al_0.1CoCrFeNi high entropy alloy. Mater. Res. Lett., 2015, 3(1): 30.

[28] Selvam K, Rakesh BS, Grewal HS, Arora HS, Singh H. High strain deformation of austenitic steel for enhancing erosion resistance. Wear, 2017, 376–377, 1021.

[29] Oliver WC, Pharr GM. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J. Mater. Res., 1992, 7(6): 1564.

[30] Kumar N, Ying Q, Nie X, Mishra RS, Tang Z, Liaw PK, Brennan RE, Doherty KJ, Cho KC. High strain-rate compressive deformation behavior of the Al_0.1CrFeCoNi high entropy alloy. Mater. Des., 2015, 86, 598.

[31] H.S. Arora, A. Ayyagari, J. Saini, K. Selvam, S. Riyadh, M. Pole, H.S. Grewal, and S. Mukherjee, High tensile ductility and strength in dual-phase bimodal steel through stationary friction stir processing, Sci. Rep., 9(2019), No. 1, art. No. 1976.

[32] Humphreys FJ, Hatherly M. Recrysstallization and Related Annealing Phenomena, 2004, 2nd ed., Oxford, Pergamon

[33] Liu SF, Wu Y, Wang HT, He JY, Liu JB, Chen CX, Liu XJ, Wang H, Lu ZP. Stacking fault energy of face-centered-cubic high entropy alloys. Intermetallics, 2018, 93, 269.

[34] Zaddach AJ, Niu C, Koch CC, Irving DL. Mechanical properties and stacking fault energies of NiFeCrCoMn high-entropy alloy. JOM, 2013, 65(12): 1780.

[35] Huang S, Li W, Lu S, Tian FY, Shen J, Holmström E, Vitos L. Temperature dependent stacking fault energy of FeCrCoNiMn high entropy alloy. Scripta Mater., 2015, 108, 44.

[36] Liu JB, Chen CX, Xu YQ, Wu SW, Wang G, Wang HT, Fang YT, Meng L. Deformation twinning behaviors of the low stacking fault energy high-entropy alloy: An in-sttu TEM study. Scripta Mater., 2017, 137, 9.

[37] Eleti RR, Bhattacharjee T, Zhao LJ, Bhattacharjee PP, Tsuji N. Hot deformation behavior of CoCrFeMnNi FCC high entropy alloy. Mater. Chem. Phys., 2018, 210, 176.

[38] Tsai K-Y, Tsai M-H, Yeh J-W. Sluggish diffusion in Co–Cr–Fe–Mn–Ni high-entropy alloys. Acta Mater., 2013, 61(13): 4887.

[39] H.S. Grewal, R.M. Sanjiv, H.S. Arora, R. Kumar, A. Ayyagari, S. Mukherjee, and H. Singh, Activation energy and high temperature oxidation behavior of multi-principal element alloy, Adv. Eng. Mater., 19(2017), No. 11, art. No. 1700182.

[40] Dieter GE. Mechanical Metallurgy, 1986, 3rd ed., New York, McGraw-hill

[41] Du LM, Lan LW, Zhu S, Yang HJ, Shi XH, Liaw PK, Qiao JW. Effects of temperature on the tribological behavior of Al_0.25CoCrFeNi high-entropy alloy. J. Mater. Sci. Technol., 2019, 35(5): 917.

[42] Cahoon JR, Broughton WH, Kutzak AR. The determination of yield strength from hardness measurements. Metall. Trans., 1971, 2(7): 1979.

[43] Giannakopoulos AE, Suresh S. Determination of elastoplastic properties by instrumented sharp indentation. Scripta Mater., 1999, 40(10): 1191.

[44] Zhang F, Huang MZ, Shi DK. The relationship between the strain-hardening exponent n and the microstructure of metals. Mater. Sci. Eng. A, 1989, 122(2): 211.

[45] Bregliozzi G, Di Schino A, Ahmed SI-U, Kenny JM, Haefke H. Cavitation wear behaviour of austenitic stainless steels with different grain sizes. Wear, 2005, 258(1–4): 503.

[46] Feller HG, Kharrazi Y. Cavitation erosion of metals and alloys. Wear, 1984, 93(3): 249.

[47] Selvam K, Saini J, Perumal G, Ayyagari A, Salloom R, Mondal R, Mukherjee S, Grewal HS, Arora HS. Exceptional cavitation erosion—corrosion behavior of dual-phase bimodal structure in austenitic stainless steel. Tribol. Int., 2019, 134, 77.

[48] Zhang TW, Ma SG, Zhao D, Wu YC, Zhang Y, Wang ZH, Qiao JW. Simultaneous enhancement of strength and ductility in a NiCoCrFe high-entropy alloy upon dynamic tension: Micromechanism and constitutive modeling. Int. J. Plast., 2020, 124, 226.

[49] M. Calcagnotto, D. Ponge, Y. Adachi, and D. Raabe, Effect of grain refinement on strength and ductility in dual-phase steels, [in] Proceedings of the 2nd International Symposium on Steel Science, Kyoto, 2009.

[50] Zhang S, Wu CL, Zhang CH, Guan M, Tan JZ. Laser surface alloying of FeCoCrAlNi high-entropy alloy on 304 stainless steel to enhance corrosion and cavitation erosion resistance. Opt. Laser Technol., 2016, 84, 23.

[51] Selvam K, Mandal P, Grewal HS, Arora HS. Ultrasonic cavitation erosion—corrosion behavior of friction stir processed stainless steel. Ultrason. Sonochem., 2018, 44, 331.

[52] Komarasamy M, Alagarsamy K, Mishra RS. Serration behavior and negative strain rate sensitivity of Al_0.1CoCrFeNi high entropy alloy. Intermetallics, 2017, 84, 20.