Microstructure, thermal properties, and corrosion behaviors of FeSiBAlNi alloy fabricated by mechanical alloying and spark plasma sintering

Abstract

An equiatomic FeSiBAlNi amorphous high-entropy alloy (HEA) was fabricated by mechanical alloying (MA). A fully amorphous phase was obtained in the FeSiBAlNi HEA after 240 h of MA. The bulk FeSiBAlNi samples were sintered by spark plasma sintering (SPS) at 520 and 1080°C under a pressure of 80 MPa. The sample sintered at 520°C exhibited an amorphous composite structure comprising solid-solution phases (body-centered cubic (bcc) and face-centered cubic (fcc) phases). When the as-milled amorphous HEA was consolidated at 1080°C, another fcc phase appeared and the amorphous phase disappeared. The sample sintered by SPS at 1080°C exhibited a slightly higher melting temperature compared with those of the as-milled alloy and the bulk sample sintered at 520°C. The corrosion behaviors of the as-sintered samples were investigated by potentiodynamic polarization measurements and immersion tests in seawater solution. The results showed that the HEA obtained by SPS at 1080°C exhibited better corrosion resistance than that obtained by SPS at 520°C.

Keywords

high entropy alloys / spark plasma sintering / mechanical alloying / microstructure / corrosion resistance

References

[1] Zhang Y., Zhou Y.J., Lin J.P., Chen G.L., Liaw P.K. Solid solution phase formation rules for multi-component alloys. Adv. Eng. Mater., 2008, 10(6): 534.

[2] Guo S., Liu C.T. Phase stability in high entropy alloys: formation of solid-solution phase or amorphous phase. Prog. Nat. Sci. Mater. Int., 2011, 21(6): 433.

[3] Yeh J.W. Recent progress in high-entropy alloys. Ann. Chim., 2006, 31, 633.

[4] Lin C.M., Tsai H.L. Evolution of microstructure. hardness, and corrosion properties of high-entropy Al0.5CoCrFeNi alloy, Intermetallics, 2011, 19(3): 288.

[5] Singh S., Wanderka N., Murty B.S., Glatzel U., Banhart J. Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy. Acta Mater., 2011, 59(1): 182.

[6] Zhang Y., Zuo T.T., Cheng Y.Q., Liaw P.K. High-entropy alloys with high saturation magnetization. electrical resistivity, and malleability, Sci. Rep., 2013, 3, 1.

[7] Wen L.H., Kou H.C., Li J.S., Chang H., Xue X.Y., Zhou L. Effect of aging temperature on microstructure and properties of AlCoCrCuFeNi high-entropy alloy. Intermetallics, 2009, 17(4): 266.

[8] Yeh J.W., Chen S.K., Lin S.J., Gan J.Y., Chin T.S., Shun T.T., Tsau C.H., Chang S.Y. Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Adv. Eng. Mater., 2004, 6(5): 299.

[9] Wang C., Ji W., Fu Z.Y. Mechanical alloying and spark plasma sintering of CoCrFeNiMnAl high-entropy alloy. Adv. Powder Technol., 2014, 25(4): 1334.

[10] Zhang K.B., Fu Z.Y., Zhang J.Y., Shi J., Wang W.M., Wang H., Wang Y.C., Zhang Q.J. Nanocrystalline CoCrFeNiCuAl high-entropy solid solution synthesized by mechanical alloying. J. Alloys Compd., 2009, 485(1-2): L31.

[11] Chen W.P., Fu Z.Q., Fang S.C., Xiao H.Q., Zhu D.Z. Alloying behavior, microstructure and mechanical properties in a FeNiCrCo0.3Al0.7 high entropy alloy. Mater. Des., 2013, 51, 854.

[12] Ji W., Wang W.M., Wang H., Zhang J.Y., Wang Y.C., Zhang F., Fu Z.Y. Alloying behavior and novel properties of CoCrFeNiMn high-entropy alloy fabricated by mechanical alloying and spark plasma sintering. Intermetallics, 2015, 56, 24.

[13] Abdellahi M., Heidari J., Sabouhi R. Influence of B source materials on the synthesis of TiB₂ -Al2 O₃ nanocomposite powders by mechanical alloying. Int. J. Miner. Mettall. Mater., 2013, 20(12): 1214.

[14] Ji W., Fu Z.Y., Wang W.M., Wang H., Zhang J.Y., Wang Y.C., Zhang F. Mechanical alloying synthesis and spark plasma sintering consolidation of CoCrFeNiAl high-entropy alloy. J. Alloys Compd., 2014, 589, 61.

[15] Fu Z.Q., Chen W.P., Fang S.C., Zhang D.Y., Xiao H.Q., Zhu D.Z. Alloying behavior and deformation twinning in a CoNiFeCrAl0.6Ti0.4 high entropy alloy processed by spark plasma sintering. J. Alloys Compd., 2013, 553, 316.

[16] Fu Z.Q., Chen W.P., Xiao H.Q., Zhou L.W., Zhu D.Z., Yang S.F. Fabrication and properties of nanocrystalline Co0.5FeNiCrTi0.5 high entropy alloy by MA-SPS technique. Mater. Des., 2013, 44, 535.

[17] Fang S.C., Chen W.P., Fu Z.Q. Microstructure and mechanical properties of twinned Al0.5CrFeNiCo0.3C0.2 high entropy alloy processed by mechanical alloying and spark plasma sintering. Mater. Des., 2014, 54, 973.

[18] Fu Z.Q., Chen W.P., Chen Z., Wen H.M., Lavernia E.J. Influence of Ti addition and sintering method on microstructure and mechanical behavior of a medium-entropy Al0.6CoNiFe alloy. Mater. Sci. Eng. A, 2014, 619, 137.

[19] Sriharith R., Murty B.S., Kottada R.S. Alloying, thermal stability and strengthening in spark plasma sintered Alx- CoCrCuFeNi high entropy alloys. J. Alloys Compd., 2014, 583, 419.

[20] Wang J., Zheng Z., Xu J., Wang Y. Microstructure and magnetic properties of mechanically alloyed FeSiBAlNi (Nb) high entropy alloys. J. Magn. Magn. Mater., 2014, 355, 58.

[21] Fang S.S., Xiao X.S., Xia L., Li W.H., Dong Y.D. Relationship between the widths of supercooled liquid regions and bond parameters of Mg-based bulk metallic glasses. J. Non Cryst. Solids, 2003, 321(1-2): 120.

[22] Kittel C. Introduction to Solid State Physics. 6th Ed.. John Wiley & Songs, Inc., New York, 1980 26.

[23] Takeuchi A., Inoue A. Calculations of mixing enthalpy and mismatch entropy for ternary amorphous alloys. Mater. Trans. JIM, 2000, 41(11): 1372.

[24] Guo S., Hu Q., Ng C., Liu C.T. More than entropy in high-entropy alloys: Forming solid solutions or amorphous phase. Intermetallics, 2013, 41, 96.