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.
YehJ. W.: ‘Recent progress in high-entropy alloys’, Ann. Chim. Sci. Mater., 2006, 31, 633–648.
2.
YehJ. W.: ‘High entropy multielement alloys’. US Patent 0159914A1, 31 October 2002..
3.
ZhangY., ZuoT. T., TangZ., GaoM. C., DahmenK. A., LiawP. K. and LuZ. P.: ‘Microstructures and properties of high-entropy alloys’, Prog. Mater. Sci., 2014, 61, 1–93.
4.
VaralakshmiS., KamarajM. and MurtyB. S.: ‘Formation and stability of equiatomic and nonequiatomic nanocrystalline CuNiCoZnAlTi high-entropy alloys by mechanical alloying’, Metall. Mater. Trans. A, 2010, 41A, 2703–2709.
5.
DoliqueV., ThomannA. L., BraultP., TessierY. and GillonP.: ‘Complex structure/composition relationship in thin films of AlCoCrCuFeNi high entropy alloy’, Mater. Chem. Phys., 2009, 117, (1), 142–147.
6.
ZhangH., PanY. and HeY. Z.: ‘Synthesis and characterization of FeCoNiCrCu high-entropy alloy coating by laser cladding’, Mater. Des., 2011, 32, (4), 1910–1915.
7.
SoareV., MitricaD., ConstantinI., PopescuG., CsakiI., TarcoleaM. and CarceaI.: ‘The mechanical and corrosion behaviors of as-cast and re-melted AlCrCuFeMnNi multi-component high-entropy alloy’, Metall. Mater. Trans. A, DOI 10.1007/s11661-014-2523-72014.
8.
TangW. Y. and YehJ. W.: ‘Effect of aluminum content on plasma-nitrided AlxCoCrCuFeNi high-entropy alloys’, Metall. Mater. Trans. A, 2009, 40A, 1479–1486.
9.
SenkovO. N., WilksG. B., ScottJ. M. and MiracleD. B.: ‘Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high-entropy alloys’, Intermetallics, 2011, 19, 698–706.
10.
WuZ. F., WangX. D., CaoQ. P., ZhaoG. H., LiJ. X., ZhangD. X., ZhuJ. J. and JiangJ. Z.: ‘Microstructure characterization of AlxCo1Cr1Cu1Fe1Ni1 (x = 0 and 2.5) high-entropy alloy films’, J. Alloys Compd, 2014, 609, 137–142.
11.
KaoY. F., ChenS. K., ChenT. J., ChuaP. C., YehJ. W. and LinS. J.: ‘Electrical, magnetic, and Hall properties of AlxCoCrFeNi high-entropy alloys’, J. Alloys Compd, 2011, 509, 1607–1614.
12.
WenL. H., KouH. C., LiJ. S., ChangH., XueX. Y. and ZhouL.: ‘Effect of aging temperature on microstructure and properties of AlCoCrCuFeNi high-entropy alloy’, Intermetallics, 2009, 17, 266–269.
13.
WangY. P., LiB. S., RenM. X., YangC. and FuH. Z.: ‘Microstructure and compressive properties of AlCrFeCoNi high entropy alloy’, Mater. Sci. Eng. A, 2008, A491, 154–158.
14.
TungC. C., YehJ. W., ShunT., ChenS. K., HuangY. S. and ChenH. C.: ‘On the elemental effect of AlCoCrCuFeNi high-entropy alloy system’, Mater. Lett., 2007, 61, 1–5.
15.
HeJ. Y., LiuW. H., WangH., WuY., LiuX. J., NiehT. G. and LuZ. P.: ‘Microstructure and properties of AlCrFeCuNix (0.6 ≤ x ≤ 1.4) high-entropy alloys’, Acta Mater., 2014, 62, 105–113.
16.
JinhongP., YeP., HuiZ. and LuZ.: ‘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.
TangZ., HuangL., HeW. and LiawP. K.: ‘Alloying and processing effects on the aqueous corrosion behavior of high-entropy alloys’, Entropy, 2014, 16, 895–911.
18.
TongC. J., ChenM. R., ChenS. K., YehJ. W., ShunT. T., LinS. J. and ChangS. Y.: ‘Mechanical performance of the AlxCoCrCuFeNi high-entropy alloy system with multiprincipal elements’, Metall. Mater. Trans. A, 2005, 36A, (5), 1263–1271.
19.
TongC. J., ChenY. L., ChenS. K., YehJ. W., ShunT. T., TsauC. H., LinS. J. and ChangS. Y.: ‘Microstructure characterization of AlxCoCrCuFeNi high-entropy alloy system with multiprincipal elements’, Metall. Mater. Trans. A, 2005, 36A, (4), 881–893.
20.
ZhouY. J., ZhangY., WangY. L. and ChenG. L.: ‘Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties’, Appl. Phys. Lett., 2007, 90, 181904.
21.
ZhangK., FuZ. Y., ZhangJ. Y., WangW. M., WangH., WangY. C., ZhangQ. J. and ShiJ.: ‘Microstructure and mechanical properties of CoCrFeNiTiAlx high-entropy alloys’, Mater. Sci. Eng. A, 2009, A508, 214–219.
22.
LeeC. P., ChenY. Y., HsuC. Y., YehJ. W. and ShihH. C.: ‘The effect of boron on the corrosion resistance of the high entropy alloys Al0.5CoCrCuFeNiBx’, J. Electrochem. Soc., 2007, 154, (8), C424–C430.
23.
ChenY. Y., DuvalT., HungU. D., YehJ. W. and ShihH. C.: ‘Microstructure and electrochemical properties of high entropy alloys—a comparison with type-304 stainless steel’, Corros. Sci., 2005, 47, (9), 2257–2279.
24.
HsuY. J., ChiangW. C. and WuJ. K.: ‘Corrosion behavior of FeCoNiCrCux high-entropy alloys in 3.5 sodium chloride solution’, Chem. Phys., 2005, 92, (1), 112–117.
25.
LeeC. P., ChangC. C., ChenY. Y., YehJ. W. and ShihH. C.: ‘Effect of the aluminium content of AlxCrFe1.5MnNi0.5 high-entropy alloys on the corrosion behaviour in aqueous environments’, Corros. Sci., 2008, 50, (7), 2053–2060.
26.
KeG., ChenG., HsuT. and YehJ.: ‘FCC and BCC equivalents in as-cast solid solutions of AlxCoyCrzCu0.5FevNiw high-entropy alloys’, Ann. Chim., 2006, 31, (6), 669–683.
27.
RenB., LiuZ. X., LiD. M., ShiL., CaiB. and WangM. X.: ‘Effect of elemental interaction on microstructure of CuCrFeNiMn high entropy alloy system’, J. Alloys Compd, 2010, 493, 148–153.
28.
SinghS., WanderkaN., MurtyB. S., GlatzelU. and BanhartJ.: ‘Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy’, Acta Mater., 2011, 59, (1), 182–190.
29.
KaoY. F., ChenaT. J., ChenS. K. and YehJ. W.: ‘Microstructure and mechanical property of as-cast, -homogenized, and -deformed AlxCoCrFeNi (0 ≤ x ≤ 2) high-entropy alloys’, J. Alloys Compd, 2009, 488, 57–64.
30.
LiB. S., WangY. P., RenM. X., YangC. and FuH. 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.
LeeC. P., ChangC. C., ChenY. Y., YehJ. W. and ShihH. C.: ‘Effect of the aluminium content of AlxCrFe1.5MnNi0.5 high-entropy alloys on the corrosion behaviour in aqueous environments’, Corros. Sci., 2008, 50, 2053–2060.
32.
HongbaoC., YingW., JinyongW., XuefengG. and HengzhiF.: ‘Microstructural evolution and corrosion behavior of directionally solidified FeCoNiCrAl high entropy alloy’, China Foundry, 2011, 8, (3), 259–263.
