Microstructure and mechanical properties of CoCrFeMnNi high entropy alloy with ultrasonic nanocrystal surface modification process

doi:10.1016/j.jmst.2020.02.083

Abstract

Abstract:

In this study, mechanical properties improvement of equiatomic CoCrFeMnNi treated with an ultrasonic nanocrystal surface modification (UNSM) was studied. The applied UNSM treatment with static loads of 10 N, 20 N, and 60 N provided a severe plastic deformation, which produced a gradient structure. The near-surface area exhibited a high number of dislocation densities and deformation twin interaction, leading to a surface strengthening and hardness improvement of up to 112% than the deformation-free interior region. Increment of dislocation densities and deformation twin formation on the surface also enhanced the yield and ultimate tensile strength of the UNSM-treated specimens. Furthermore, the combination of hard nanocrystallites layer on the surface and ductile coarse grain in the specimen interior as a result of the UNSM treatment successfully maintained the strength-ductility balance of the CoCrFeMnNi.

Key words: High-entropy alloy, Ultrasonic nanocrystal surface modification, Severe plastic deformation, Microstructures, Mechanical properties

Timothy Alexander Listyawan, Hyunjong Lee, Nokeun Park, Unhae Lee. Microstructure and mechanical properties of CoCrFeMnNi high entropy alloy with ultrasonic nanocrystal surface modification process[J]. J. Mater. Sci. Technol., 2020, 57: 123-130.

Figures/Tables 8

Fig. 1. Schematic of the UNSM process from the side view and front view.

Fig. 2. X-ray diffraction pattern of the untreated (0 N), 10 N, 20 N, and 60 N specimens.

Fig. 3. Electron backscattered diffraction from a cross-section point of view of the 10 N, 20 N and 60 N specimens. Image quality map, overall kernel average misorientation map, and near-surface KAM and IQ map of specimens (a-d) 10 N, (e-h) 20 N, (i-l) 60 N, respectively.

Fig. 4. TEM image taken from the top surface of the treated specimen. 10 N specimen: (a) deformation twin, (b) higher magnification image and (c) SAED pattern. 60 N specimen: (d) deformation twin, (e) deformation twin intersection and (f) SAED pattern. The yellow arrow indicates the deformation twin (DT).

Fig. 5. (a) Dislocation density distribution, (b) deformation twin frequency (number of deformation twin per 100 μm) and mean value of dislocation density at a distance of approximately 90 μm from the top surface.

Fig. 6. Vickers microhardness of UNSM treated specimens measured from the top surface down to the middle of the specimens.

Fig. 7. Room temperature tensile (a) engineering stress-strain curves, and (b) strain hardening rate and true stress-strain curves of untreated and UNSM treated specimens.

Fig. 8. (a) Ultimate tensile strength and yield strength, (b) uniform and total elongation as a function of UNSM static load.

References 51

[1]	J. Yeh, S. Chen, S. Lin, J. Gan, T. Chin, T. Shun, C. Tsau, S. Chang, Adv. Eng. Mater. 6(2004) 299-303.
[2]	C.J. Tong, M.R. Chen, S.K. Chen, J.W. Yeh, T.T. Shun, S.J. Lin, S.Y. Chang, Metall. Mater. Trans. A Phys. Metall. Mater. Sci. 36(2005) 1263-1271. DOI URL
[3]	C.J. Tong, Y.L. Chen, S.K. Chen, J.W. Yeh, T.T. Shun, C.H. Tsau, S.J. Lin, S.Y. Chang, Metall. Mater. Trans. A Phys. Metall. Mater. Sci. 36(2005) 881-893.
[4]	S. Nam, C. Kim, Y.-M. Kim, J. Weld, Join. 35(2017) 58-66.
[5]	Y.F. Ye, Q. Wang, J. Lu, C.T. Liu, Y. Yang, Mater. Today 19 (2016) 349-362.
[6]	D.B. Miracle, O.N. Senkov, Acta Mater. 122(2017) 448-511.
[7]	G. Qin, R. Chen, H. Zheng, H. Fang, L. Wang, Y. Su, J. Guo, H. Fu, J. Mater. Sci. Technol. 35(2019) 578-583.
[8]	J. Li, S. Xiang, H. Luan, A. Amar, X. Liu, S. Lu, Y. Zeng, G. Le, X. Wang, F. Qu, C. Jiang, G. Yang, J. Mater. Sci. Technol. 35(2019) 2430-2434.
[9]	W.R. Wang, W.L. Wang, S.C. Wang, Y.C. Tsai, C.H. Lai, J.W. Yeh, Intermetallics 26 (2012) 44-51.
[10]	B. Cantor, I.T.H. Chang, P. Knight, A.J.B. Vincent, Mater. Sci. Eng. A 375-377(2004) 213-218.
[11]	B. Cantor, Entropy 16 (2014) 4749-4768.
[12]	T. Zhang, L. Xin, F. Wu, R. Zhao, J. Xiang, M. Chen, S. Jiang, Y. Huang, S. Chen, J. Mater. Sci. Technol. 35(2019) 2331-2335.
[13]	N. Park, B.J. Lee, N. Tsuji, J. Alloy Compd. 719(2017) 189-193.
[14]	B. Gludovatz, A. Hohenwarter, D. Catoor, E.H. Chang, E.P. George, R.O. Ritchie, Science 345 (80-) (2014) 1153-1158.
[15]	Y.F. Kao, T.J. Chen, S.K. Chen, J.W. Yeh, J. Alloy Compd. 488(2009) 57-64.
[16]	Y. Deng, C.C. Tasan, K.G. Pradeep, H. Springer, A. Kostka, D. Raabe, Acta Mater. 94(2015) 124-133.
[17]	X. Xian, L. Lin, Z. Zhong, C. Zhang, C. Chen, K. Song, J. Cheng, Y. Wu, Mater. Sci. Eng. A 713 (2018) 134-140.
[18]	D. Edgard Jodi, J. Park, N. Park, Mater. Lett. 258(2019), 126772.
[19]	S. Bagherifard, D.J. Hickey, S. Fintová, F. Pastorek, I. Fernandez-Pariente, M. Bandini, T.J. Webster, M. Guagliano, Acta Biomater. 66(2018) 93-108.
[20]	K. Lu, J. Lu, Mater. Sci. Eng.A 375-377(2004) 38-45.
[21]	J. Byun, H. Yi, S. Cho, J. Weld. Join. 35(2017) 6-12.
[22]	W.T. Tsai, C.S. Chang, J.T. Lee, Corrosion 50 (1994) 98-105.
[23]	K.Y. Zhang, Y.S. Pyoun, X.J. Cao, B. Wu, R. Murakami, Int. J. Mod. Phys. Conf. Ser. 06(2012) 330-335.
[24]	H.S. Cho, I.K. Park, K.W. Jung, J. Weld. Join. 33(2015) 40-46.
[25]	Y. He, K. Li, I. Shik Cho, C. Soon Lee, I. Gyu Park, K. Shin, Microsc. Microanal. 20(2014) 844-845.
[26]	A. Amanov, Y. Pyun, S. Sasaki, Tribol. Int. 72(2014) 187-197.
[27]	C. Ye, X. Zhou, A. Telang, H. Gao, Z. Ren, H. Qin, S. Suslov, A.S. Gill, S.R. Mannava, D. Qian, G.L. Doll, A. Martini, N. Sahai, V.K. Vasudevan, J. Mech. Behav. Biomed. Mater. 53(2016) 455-462. URL PMID
[28]	C. Ye, A. Telang, A.S. Gill, S. Suslov, Y. Idell, K. Zweiacker, J.M.K. Wiezorek, Z. Zhou, D. Qian, S.R. Mannava, V.K. Vasudevan, Mater. Sci. Eng. A 613 (2014) 274-288.
[29]	H. Qin, Z. Ren, J. Zhao, C. Ye, G.L. Doll, Y. Dong, Wear 392-393(2017) 29-38.
[30]	M.T. Tsai, J.C. Huang, W.Y. Tsai, T.H. Chou, C. Chen, T.H. Li, J.S.C. Jang, Intermetallics 93 (2018) 113-121.
[31]	M. Li, Q. Zhang, B. Han, L. Song, J. Li, J. Yang, J. Alloy Compd. (2019) 152626.
[32]	L. Kubin, A. Mortensen, Scr. Mater. 48(2003) 119-125.
[33]	M. Calcagnotto, D. Ponge, E. Demir, D. Raabe, Mater. Sci. Eng. A 527 (2010) 2738-2746.
[34]	D.W. Hetzner, Microsc. Microanal. 9(2003) 708-709.
[35]	G. Laplanche, A. Kostka, O.M. Horst, G. Eggeler, E.P. George, Acta Mater. 118(2016) 152-163.
[36]	M. Kattoura, A. Telang, S.R. Mannava, D. Qian, V.K. Vasudevan, Mater. Sci. Eng. A 711 (2018) 364-377.
[37]	C. Ye, A. Telang, A.S. Gill, S. Suslov, Y. Idell, K. Zweiacker, J.M.K. Wiezorek, Z. Zhou, D. Qian, S.R. Mannava, V.K. Vasudevan, Mater. Sci. Eng. A 613 (2014) 274-288.
[38]	Tang Chen, Hu Zhang, Starink Gao, Metals (Basel). 9(2019) 1182.
[39]	A. Cherif, Y. Pyoun, B. Scholtes, J. Mater. Eng. Perform. 19(2010) 282-286.
[40]	H.Y. Diao, R. Feng, K.A. Dahmen, P.K. Liaw, Curr. Opin. Solid State Mater.Sci. 21(2017) 252-266.
[41]	S.J. Sun, Y.Z. Tian, H.R. Lin, H.J. Yang, X.G. Dong, Y.H. Wang, Z.F. Zhang, Mater. Sci. Eng. A 712 (2018) 603-607.
[42]	J. He, Q. Wang, H. Zhang, L. Dai, T. Mukai, Y. Wu, X. Liu, H. Wang, T.G. Nieh, Z. Lu, Sci. Bull. 63(2018) 362-368.
[43]	Y. Cao, Y.B. Wang, X.Z. Liao, M. Kawasaki, S.P. Ringer, T.G. Langdon, Y.T. Zhu, Appl. Phys. Lett. 101 (2012).
[44]	A.J. Zaddach, C. Niu, C.C. Koch, D.L. Irving, JOM 65 (2013) 1780-1789.
[45]	S.J. Sun, Y.Z. Tian, H.R. Lin, X.G. Dong, Y.H. Wang, Z.J. Zhang, Z.F. Zhang, Mater. Des. 133(2017) 122-127.
[46]	L. Patriarca, A. Ojha, H. Sehitoglu, Y.I. Chumlyakov, Scr. Mater. 112(2016) 54-57.
[47]	S.S. Nene, M. Frank, K. Liu, R.S. Mishra, B.A. McWilliams, K.C. Cho, Sci. Rep. 8(2018) 1-8. URL PMID
[48]	Y.M. Wang, E. Ma, Mater. Sci. Eng.A 375-377(2004) 46-52.
[49]	Z.X. Wu, Y.W. Zhang, D.J. Srolovitz, Acta Mater. 57(2009) 4508-4518.
[50]	H. Shahmir, J. He, Z. Lu, M. Kawasaki, T.G. Langdon, Mater. Sci. Eng. A 676 (2016) 294-303.
[51]	Z. Wu, H. Bei, G.M. Pharr, E.P. George, Acta Mater. 81(2014) 428-441.