Influence of remelting on microstructure,hardness and corrosion behaviour of AlCoCrFeNiTi high entropy alloy

Abstract

High entropy alloys are a newly developed class of alloys, which tend to form a single solid solution or a mixture of solid solutions with simple crystal structures. These alloys possess excellent mechanical properties, thermal stability and corrosion resistance. In the present paper, an AlCoCrFeNiTi high entropy alloy was obtained by induction melting, and the influence of the remelting process on the mechanical and corrosion resistance characteristics of the alloy was investigated. Thus, optical and scanning electron microscopy revealed less phase segregation and a fine dendritic structure for the remelted alloy, while corrosion tests indicated that present alloy, in remelted state, has better corrosion resistance than as cast alloy and stainless steel. The Vickers microhardness measurements demonstrated an improvement of the alloy microhardness by remelting process due to the decrease in phase segregation and the increase in dendrite refinement level.

Keywords

High entropy alloy Vacuum induction melting Microstructure Solid solution Hardness Corrosion resistance

Get full access to this article

View all access options for this article.

References

Yeh

J. W.

: ‘Recent progress in high-entropy alloys’, Ann. Chim. Sci. Mater., 2006, 31, 633–648.

Yeh

J. W.

: ‘High entropy multielement alloys’. US Patent 0159914A1, 31 October 2002..

Zhang

, Zuo

T. T.

, Tang

, Gao

M. C.

, Dahmen

K. A.

, Liaw

P. K.

and Lu

Z. P.

: ‘Microstructures and properties of high-entropy alloys’, Prog. Mater. Sci., 2014, 61, 1–93.

Varalakshmi

, Kamaraj

and Murty

B. S.

: ‘Formation and stability of equiatomic and nonequiatomic nanocrystalline CuNiCoZnAlTi high-entropy alloys by mechanical alloying’, Metall. Mater. Trans. A, 2010, 41A, 2703–2709.

Dolique

, Thomann

A. L.

, Brault

, Tessier

and Gillon

: ‘Complex structure/composition relationship in thin films of AlCoCrCuFeNi high entropy alloy’, Mater. Chem. Phys., 2009, 117, (1), 142–147.

Zhang

, Pan

and He

Y. Z.

: ‘Synthesis and characterization of FeCoNiCrCu high-entropy alloy coating by laser cladding’, Mater. Des., 2011, 32, (4), 1910–1915.

Soare

, Mitrica

, Constantin

, Popescu

, Csaki

, Tarcolea

and Carcea

: ‘The mechanical and corrosion behaviors of as-cast and re-melted AlCrCuFeMnNi multi-component high-entropy alloy’, Metall. Mater. Trans. A, DOI 10.1007/s11661-014-2523-7 2014.

Tang

W. Y.

and Yeh

J. W.

: ‘Effect of aluminum content on plasma-nitrided AlxCoCrCuFeNi high-entropy alloys’, Metall. Mater. Trans. A, 2009, 40A, 1479–1486.

Senkov

O. N.

, Wilks

G. B.

, Scott

J. M.

and Miracle

D. B.

: ‘Mechanical properties of Nb₂₅Mo₂₅Ta₂₅W₂₅ and V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ refractory high-entropy alloys’, Intermetallics, 2011, 19, 698–706.

10.

Z. F.

, Wang

X. D.

, Cao

Q. P.

, Zhao

G. H.

, Li

J. X.

, Zhang

D. X.

, Zhu

J. J.

and Jiang

J. Z.

: ‘Microstructure characterization of Al_xCo₁Cr₁Cu₁Fe₁Ni₁ (x = 0 and 2.5) high-entropy alloy films’, J. Alloys Compd, 2014, 609, 137–142.

11.

Kao

Y. F.

, Chen

S. K.

, Chen

T. J.

, Chua

P. C.

, Yeh

J. W.

and Lin

S. J.

: ‘Electrical, magnetic, and Hall properties of Al_xCoCrFeNi high-entropy alloys’, J. Alloys Compd, 2011, 509, 1607–1614.

12.

Wen

L. H.

, Kou

H. C.

, Li

J. S.

, Chang

, Xue

X. Y.

and Zhou

: ‘Effect of aging temperature on microstructure and properties of AlCoCrCuFeNi high-entropy alloy’, Intermetallics, 2009, 17, 266–269.

13.

Wang

Y. P.

, Li

B. S.

, Ren

M. X.

, Yang

and Fu

H. Z.

: ‘Microstructure and compressive properties of AlCrFeCoNi high entropy alloy’, Mater. Sci. Eng. A, 2008, A491, 154–158.

14.

Tung

C. C.

, Yeh

J. W.

, Shun

, Chen

S. K.

, Huang

Y. S.

and Chen

H. C.

: ‘On the elemental effect of AlCoCrCuFeNi high-entropy alloy system’, Mater. Lett., 2007, 61, 1–5.

15.

J. Y.

, Liu

W. H.

, Wang

, Wu

, Liu

X. J.

, Nieh

T. G.

and Lu

Z. P.

: ‘Microstructure and properties of AlCrFeCuNi_x (0.6 ≤ x ≤ 1.4) high-entropy alloys’, Acta Mater., 2014, 62, 105–113.

16.

Jinhong

, Ye

, Hui

and Lu

: ‘Effects of Al addition on structural evolution and tensile properties of the FeCoNiCrMn high-entropy alloy system’, Mater. Sci. Eng. A, 2011, A534, 228–233.

17.

Tang

, Huang

, He

and Liaw

P. K.

: ‘Alloying and processing effects on the aqueous corrosion behavior of high-entropy alloys’, Entropy, 2014, 16, 895–911.

18.

Tong

C. J.

, Chen

M. R.

, Chen

S. K.

, Yeh

J. W.

, Shun

T. T.

, Lin

S. J.

and Chang

S. Y.

: ‘Mechanical performance of the AlxCoCrCuFeNi high-entropy alloy system with multiprincipal elements’, Metall. Mater. Trans. A, 2005, 36A, (5), 1263–1271.

19.

Tong

C. J.

, Chen

Y. L.

, Chen

S. K.

, Yeh

J. W.

, Shun

T. T.

, Tsau

C. H.

, Lin

S. J.

and Chang

S. Y.

: ‘Microstructure characterization of AlxCoCrCuFeNi high-entropy alloy system with multiprincipal elements’, Metall. Mater. Trans. A, 2005, 36A, (4), 881–893.

20.

Zhou

Y. J.

, Zhang

, Wang

Y. L.

and Chen

G. L.

: ‘Solid solution alloys of AlCoCrFeNiTi_x with excellent room-temperature mechanical properties’, Appl. Phys. Lett., 2007, 90, 181904.

21.

Zhang

, Fu

Z. Y.

, Zhang

J. Y.

, Wang

W. M.

, Wang

Y. C.

, Zhang

Q. J.

and Shi

: ‘Microstructure and mechanical properties of CoCrFeNiTiAlx high-entropy alloys’, Mater. Sci. Eng. A, 2009, A508, 214–219.

22.

Lee

C. P.

, Chen

Y. Y.

, Hsu

C. Y.

, Yeh

J. W.

and Shih

H. C.

: ‘The effect of boron on the corrosion resistance of the high entropy alloys Al_0.5CoCrCuFeNiBx’, J. Electrochem. Soc., 2007, 154, (8), C424–C430.

23.

Chen

Y. Y.

, Duval

, Hung

U. D.

, Yeh

J. W.

and Shih

H. C.

: ‘Microstructure and electrochemical properties of high entropy alloys—a comparison with type-304 stainless steel’, Corros. Sci., 2005, 47, (9), 2257–2279.

24.

Hsu

Y. J.

, Chiang

W. C.

and Wu

J. K.

: ‘Corrosion behavior of FeCoNiCrCu_x high-entropy alloys in 3.5 sodium chloride solution’, Chem. Phys., 2005, 92, (1), 112–117.

25.

Lee

C. P.

, Chang

C. C.

, Chen

Y. Y.

, Yeh

J. W.

and Shih

H. C.

: ‘Effect of the aluminium content of AlxCrFe_1.5MnNi_0.5 high-entropy alloys on the corrosion behaviour in aqueous environments’, Corros. Sci., 2008, 50, (7), 2053–2060.

26.

, Chen

, Hsu

and Yeh

: ‘FCC and BCC equivalents in as-cast solid solutions of Al_xCo_yCr_zCu_0.5Fe_vNi_w high-entropy alloys’, Ann. Chim., 2006, 31, (6), 669–683.

27.

Ren

, Liu

Z. X.

, Li

D. M.

, Shi

, Cai

and Wang

M. X.

: ‘Effect of elemental interaction on microstructure of CuCrFeNiMn high entropy alloy system’, J. Alloys Compd, 2010, 493, 148–153.

28.

Singh

, Wanderka

, Murty

B. S.

, Glatzel

and Banhart

: ‘Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy’, Acta Mater., 2011, 59, (1), 182–190.

29.

Kao

Y. F.

, Chena

T. J.

, Chen

S. K.

and Yeh

J. W.

: ‘Microstructure and mechanical property of as-cast, -homogenized, and -deformed Al_xCoCrFeNi (0 ≤ x ≤ 2) high-entropy alloys’, J. Alloys Compd, 2009, 488, 57–64.

30.

B. S.

, Wang

Y. P.

, Ren

M. X.

, Yang

and Fu

H. Z.

: ‘Effects of Mn, Ti and V on the microstructure and properties of AlCrFeCoNiCu high entropy alloy’, Mater. Sci. Eng. A, 2008, A498, 482–486.

31.

Lee

C. P.

, Chang

C. C.

, Chen

Y. Y.

, Yeh

J. W.

and Shih

H. C.

: ‘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, 2053–2060.

32.

Hongbao

, Ying

, Jinyong

, Xuefeng

and Hengzhi

: ‘Microstructural evolution and corrosion behavior of directionally solidified FeCoNiCrAl high entropy alloy’, China Foundry, 2011, 8, (3), 259–263.