Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Year 2024, , 25 - 31, 31.03.2024

Gökhan Polat , Hasan Kotan

https://doi.org/10.17350/HJSE19030000328

Abstract

The CoCrFeNi high entropy alloy (HEA) with face-centered cubic (FCC) crystal structure exhibits excellent ductility values even at cryogenic temperatures. However, since this HEA is relatively weak in strength, it may not meet the requirements of industrial applications in terms of strength-ductility trade-off. Therefore, the systematic addition of yttrium (Y) into CoCrFeNi HEA was investigated in the present study to increase the strength by solid solution and second phase strengthening. The HEAs were produced by vacuum arc melting, suction casting, and subsequent homogenization at 1150 °C for 24 h. The structural development of the HEAs was investigated by using the X-ray diffraction (XRD) technique revealing the formation of a solid solution phase and Ni3Y-type hexagonal structure (HS) second phase. The corresponding microstructure of the HEAs was examined under a scanning electron microscope (SEM) revealing the transformation of the microstructure from elongated grains to nearly equiaxed grains with the increase of Y content from 2 at. % to 4 at. %. The mechanical properties of the HEAs were investigated by using hardness and compression tests. The results exhibited a dramatic increase in the hardness from 143 (±2) HV to 335 (±7) HV and in the yield strength from 130 MPa to 1025 MPa with 4 at. % Y addition. Our study has revealed that the addition of rare earth Y element results in further development in the strength of the CoCrFeNi for potential engineering applications.

Keywords

high entropy alloys, strength, rare earth addition, second phase

Thanks

The authors would like to thank the Department of Metallurgical and Materials Engineering, Middle East Technical University for their support in the production of alloys.

References

• Senkov ON, Miracle DB, Chaput KJ, Couzinie JP. Development and exploration of refractory high entropy alloys—A review. Journal of Materials Research 2018 33:19. 2018; 33: 3092–3128.
• Zhang Y, Zuo TT, Tang Z, Gao MC, Dahmen KA, Liaw PK, Lu ZP. Microstructures and properties of high-entropy alloys. Progress in Materials Science. 2014; 61: 1–93.
• 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. Advanced Engineering Materials. 2004; 6: 299–303.
• Guo S, Ng C, Lu J, Liu CT. Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys. Journal of Applied Physics. 2011; 109: 103505.
• Ye YF, Wang Q, Lu J, Liu CT, Yang Y. High-entropy alloy: challenges and prospects. Materials Today. 2016; 19: 349–362.
• Gao MC, Zhang B, Guo SM, Qiao JW, Hawk JA. High-Entropy Alloys in Hexagonal Close-Packed Structure. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2016; 47: 3322–3332.
• Gludovatz B, Hohenwarter A, Catoor D, Chang EH, George EP, Ritchie RO. A fracture-resistant high-entropy alloy for cryogenic applications. Science. 2014; 345: 1153–1158.
• Liu J, Guo X, Lin Q, He Z, An X, Li L, Liaw PK, Liao X, Yu L, Lin J, Xie L, Ren J, Zhang Y. Excellent ductility and serration feature of metastable CoCrFeNi high-entropy alloy at extremely low temperatures. Science China Materials. 2019; 62: 853–863.
• Liu WH, Lu ZP, He JY, Luan JH, Wang ZJ, Liu B, Liu Y, Chen MW, Liu CT. Ductile CoCrFeNiMox high entropy alloys strengthened by hard intermetallic phases. Acta Materialia. 2016; 116: 332–342.
• Yang T, Zhao Y, Liu W, Kai J, Liu C. L12-strengthened high-entropy alloys for advanced structural applications. Journal of Materials Research. 2018; 33: 2983–2997.
• Liu WH, Yang T, Liu CT. Precipitation hardening in CoCrFeNi-based high entropy alloys. Materials Chemistry and Physics. 2018; 210: 2–11.
• Gao X, Chen R, Liu T, Fang H, Wang L, Su Y. High deformation ability induced by phase transformation through adjusting Cr content in Co-Fe-Ni-Cr high entropy alloys. J Alloy Compd. 2022; 895: 162564.
• Garcia Filho FDC, Ritchie RO, Meyers MA, Monteiro SN. Cantor-derived medium-entropy alloys: bridging the gap between traditional metallic and high-entropy alloys. Journal of Materials Research and Technology. 2022; 17: 1868–1895.
• He MY, Shen YF, Jia N, Liaw PK. C and N doping in high-entropy alloys: A pathway to achieve desired strength-ductility synergy. Applied Materials Today. 2021; 25: 101162.
• Zeng Z, Xiang M, Zhang D, Shi J, Wang W, Tang X, Tang W, Wang Y, Ma X, Chen Z, Ma W, Morita K. Mechanical properties of Cantor alloys driven by additional elements: a review. Journal of Materials Research and Technology. 2021; 15: 1920–1934.
• Tong C-J, Chen Y-L, Yeh J-W, Lin S-J, Chen S-K, Shun T-T, Tsau C-H, Chang S-Y. Mechanical Performance of the AlxCoCrCuFeNi High-Entropy Alloy System with Multiprincipal Elements. Metallurgical and Materials Transactions A. 2005; 36: 881–893.
• Tekin M, Polat G, Kotan H. An investigation of abnormal grain growth in Zr doped CoCrFeNi HEAs through in-situ formed oxide phases. Intermetallics. 2022; 146: 107588.
• Polat G, Teki̇n M, Kotan H. Role of yttrium addition and annealing temperature on thermal stability and hardness of nanocrystalline CoCrFeNi high entropy alloy. Intermetallics. 2022; 146: 107589.
• Tekin M, Polat G, Kalay YE, Kotan H. Grain size stabilization of oxide dispersion strengthened CoCrFeNi-Y2O3 high entropy alloys synthesized by mechanical alloying. Journal of Alloys and Compounds. 2021; 887: 161363.
• Zhu ZG, Ma KH, Wang Q, Shek CH. Compositional dependence of phase formation and mechanical properties in three CoCrFeNi-(Mn/Al/Cu) high entropy alloys. Intermetallics. 2016; 79: 1–11.
• Polat G, Atalay Kalsen TS. Al içeriğinin (CoCrFe)60AlXNi(40-X) yüksek entopili alaşımının yapısal ve mekanik özellikleri üzerindeki etkisi. Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi. 2023; 26: 812–822.
• Wang X, Zhang Z, Wang Z, Ren X. Microstructural Evolution and Tensile Properties of Al0.3CoCrFeNi High-Entropy Alloy Associated with B2 Precipitates. Materials. 2022; 15: 1215.
• Chen X, Qin G, Gao X, Chen R, Song Q, Cui H. Strengthening CoCrFeNi High Entropy Alloy by In-Situ Phases of Laves and ZrC. Metals and Materials International. 2023; 29: 1390–1398.
• Wang LM, Lin Q, Yue LJ, Liu L, Guo F, Wang FM. Study of application of rare earth elements in advanced low alloy steels. Journal of Alloys and Compounds. 2008; 451: 534–537.
• Zhao Y, Wang J, Zhou S, Wang X. Effects of rare earth addition on microstructure and mechanical properties of a Fe–15Mn–1.5Al–0.6C TWIP steel. Materials Science and Engineering: A. 2014; 608: 106–113.
• Zhang LJ, Zhang MD, Zhou Z, Fan JT, Cui P, Yu PF, Jing Q, Ma MZ, Liaw PK, Li G, Liu RP. Effects of rare-earth element, Y, additions on the microstructure and mechanical properties of CoCrFeNi high entropy alloy. Materials Science and Engineering: A. 2018; 725: 437–446.
• Atas MS, Yildirim M. Structural properties and cyclic oxidation behavior of Ni-Al-Y superalloys. Kovove Materialy. 2022; 60: 281–292.
• Yildirim M, Atas MS, Akdeniz MV, Mekhrabov AO. Effect of Y Addition on the Structural Properties and Oxidation Behavior of Fe60Al40-nYn Alloys (n= 1, 3, and 5 at.%). Materials at High Temperatures. 2022; 39: 220–230.
• Cullty B., Stock SR. Elements of X-Ray Diffraction: Third Edition. New York: Prentice-Hall, 2014.
• John R, Karati A, Garlapati MM, Vaidya M, Bhattacharya R, Fabijanic D, Murty BS. Influence of mechanically activated annealing on phase evolution in Al0.3CoCrFeNi high-entropy alloy. Journal of Materials Science. 2019; 54: 14588–14598.
• Keleş A, Cengız R, Yildirim M. Effect of Alloying Elements and Technological Parameters of Austempering on the Structure and Mechanical Properties of Ductile Cast Iron (ADI). Metal Science and Heat Treatment. 2023; 65: 191–199.
• Polat G, Erdal ZA, Kalay YE. Design of Novel Non-equiatomic Cu-Ni-Al-Ti Composite Medium-Entropy Alloys. Journal of Materials Engineering and Performance. 2020; 29: 2898–2908.
• Moghanni H, Dehghani K, Shafiei A. Effects of process parameters on microstructure and mechanical properties of Al0.5CoCrFeNi high entropy alloy thin sheets using pinless friction stir welding. Journal of Materials Research and Technology. 2022; 16: 1069–1089.
• Zhou YX, Hu MY, Yan P, Shi X, Chong XY, Feng J. A first-principles calculation of structural, mechanical, thermodynamic and electronic properties of binary Ni-Y compounds. RSC Advances. 2018; 8: 41575–41586.
• Beaudry B, Daane A. Yttrium-nickel system. Trans Met Soc AIME. 1960.
• Xu XD, Guo S, Nieh TG, Liu CT, Hirata A, Chen MW. Effects of mixing enthalpy and cooling rate on phase formation of AlxCoCrCuFeNi high-entropy alloys. Materialia. 2019; 6: 100292.
• Kukshal V, Patnaik A, Bhat IK. Effect of cobalt on microstructure and properties of AlCr1.5CuFeNi2Cox high-entropy alloys. Materials Research Express. 2018; 5: 046514.
• Takeuchi A, Inoue A. Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element. Materials Transactions. 2005; 46: 2817–2829.
• Oliveira PHF, Mancilha PHS, Reyes RAV, de Gouveia GL, Bolfarini C, Spinelli JE, Coury FG. Influence of the cooling rate on the solidification path and microstructure of a AlCoCrFeNi2.1 alloy. Materials Characterization. 2023; 203: 113121.
• Hong X, Hsueh CH. Effects of yttrium addition on microstructures and mechanical properties of CoCrNi medium entropy alloy. Intermetallics. 2022; 140: 107405.
• Silveira RMS Da, Guimarães AV, De Melo CH, Ribeiro RM, Farina AB, Malet L, De Almeida LH, Araujo LS. Effect of yttrium addition on phase transformations in alloy 718. Journal of Materials Research and Technology. 2022; 18: 3283–3290.
• Stepanov ND, Yurchenko NY, Tikhonovsky MA, Salishchev GA. Effect of carbon content and annealing on structure and hardness of the CoCrFeNiMn-based high entropy alloys. Journal of Alloys and Compounds. 2016; 687: 59–71.
• Fleischer RL. Substitutional solution hardening. Acta Metallurgica. 1963; 11: 203–209.
• Lin CM, Tsai HL. Evolution of microstructure, hardness, and corrosion properties of high-entropy Al0.5CoCrFeNi alloy. Intermetallics. 2011; 19: 288–294.
• Lokman M, Ab A. Enhanced lattice distortion, yield strength, critical resolved shear stress, and improving mechanical properties of transition-metals doped CrCoNi medium entropy alloy. RSC Advances. 2021; 11: 23719–23724.
• Zhang J, Chen S, Liu J, Qing Z, Wu Y. Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys. Entropy 2022, Vol 24, Page 1342. 2022; 24: 1342.
• Seifi M, Li D, Yong Z, Liaw PK, Lewandowski JJ. Fracture Toughness and Fatigue Crack Growth Behavior of As-Cast High-Entropy Alloys. Jom. 2015; 67: 2288–2295.