Abstract
The microstructures, martensitic transformation, mechanical and shape memory properties of (Ni53Mn22Co6Ga19)100–xYx (x = 0, 0.1, 0.3) high-temperature shape memory alloys were investigated. It was found that small Y addition results in the refinement of grain size and the increase of γ phase volume fraction. These changes can effectively improve the tensile ductility and fracture strength of two-phase Ni53Mn22Co6-Ga19 alloy, up to the maximum values of 10.1 % and 592 MPa respectively at x = 0.1. However, it is proposed that Y(Ni, Mn)4Ga precipitate forms in the alloys with the addition of Y, and its amount increases with further increasing Y addition. The growth of the Y(Ni, Mn)4Ga precipitate results in a decrease in the tensile ductility at x = 0.3. Results further show that shape memory properties of the studied alloys are closely related to the refinement of grain size and the alloy yield strength. While adding 0.1 at.% of Y, the shape memory effect and recovery rate decrease, resulting from the refinement of grain size, compared to those of two-phase Ni53Mn22Co6Ga19 alloy. Subsequently they increase with further increasing Y content to 0.3 at.% due to the decrease in the alloy yield strength.
References
[1] V.A.Chernenko, E.Cesari, V.V.Kokorin, I.N.Vitenko: Scripta Metall. Mater. 33 (1995) 1239–1244. 10.1016/0956-716X(95)00370-BSearch in Google Scholar
[2] X.Jin, M.Marioni, D.Bono, S.M.Allen, R.C.O'Handley, T.Y.Hsu: J. Appl. Phys. 91 (2002) 8222–8225. 10.1063/1.1419206Search in Google Scholar
[3] C.B.Jiang, G.Feng, S.K.Gong, H.B.Xu: Mater. Sci. Eng. A342 (2003) 231–235. 10.1016/S0921-5093(02)00288-5Search in Google Scholar
[4] H.B.Xu, Y.Q.Ma, C.B.Jiang: Appl. Phys. Lett. 82 (2003) 3206–3208. 10.1063/1.1541098Search in Google Scholar
[5] Y.Q.Ma, C.B.Jiang, G.Feng, H.B.Xu: Scripta Mater. 48 (2003) 365–369. 10.1016/S1359-6462(02)00450-5Search in Google Scholar
[6] Y.Q.Ma, L.H.Xu, Y.Li, C.B.Jiang, H.B.Xu, Y.K.Lee: Z. Metallkd. 96 (2005) 843–846.10.3139/146.101110Search in Google Scholar
[7] Y.Xin, Y.Li, L.Chai, H.B.Xu: Scripta Mater. 57 (2007) 599–601. 10.1016/j.scriptamat.2007.06.010Search in Google Scholar
[8] S.Y.Yang, Y.Q.Ma, H.F.Jiang, X.J.Liu: Intermetallics19 (2011) 225–228. 10.1016/j.intermet.2010.08.009Search in Google Scholar
[9] Y.Q.Ma, S.Y.Yang, Y.Liu, X.J.Liu: Acta Mater. 57 (2009) 3232–3241. 10.1016/j.actamat.2009.01.025Search in Google Scholar
[10] S.Y.Yang, Y.Liu, C.P.Wang, Z.Shi, X.J.Liu: J. Alloys Compd. 560 (2013) 84–91. 10.1016/j.jallcom.2013.01.128Search in Google Scholar
[11] S.Y.Yang, Y.Liu, C.P.Wang, X.J.Liu: Acta Mater. 60 (2012) 4255–4267. 10.1016/j.actamat.2011.10.030Search in Google Scholar
[12] K.Tsuchiya, A.Tsutsumi, H.Ohtsuka, M.Umemoto: Mater. Sci. Eng. A378 (2004) 370–376. 10.1016/j.msea.2003.11.076Search in Google Scholar
[13] W.Cai, L.Gao, A.L.Liu, J.H.Sui, Z.Y.Gao: Scripta Mater. 57 (2007) 659–662. 10.1016/j.scriptamat.2007.05.041Search in Google Scholar
[14] J.H.Sui, X.Zhang, L.Gao, W.Cai: J. Alloys Compd. 509 (2011) 8692–8699. 10.1016/j.jallcom.2011.06.013Search in Google Scholar
[15] L.Gao, W.Cai, A.L.Liu, L.C.Zhao: J. Alloys Compd. 425 (2006) 314–317. 10.1016/j.jallcom.2006.01.037Search in Google Scholar
[16] W.Cai, L.Gao, Z.Y.Gao: J. Mater. Sci. 42 (2007) 9216–9220. 10.1007/s10853-006-0465-1Search in Google Scholar
[17] L.Gao, J.H.Sui, W.Cai: J. Magn. Magn. Mater. 320 (2008) 63–67. 10.1016/j.jmmm.2007.05.006Search in Google Scholar
[18] L.Gao, Z.Y.Gao, W.Cai, L.C.Zhao: Mater. Sci. Eng. A438 (2006) 1077–1080. 10.1016/j.msea.2006.02.190Search in Google Scholar
[19] L.Gao, J.H.Sui, W.Cai, Z.Y.Gao: Solid State Commun. 149 (2009) 257–260. 10.1016/j.ssc.2008.10.030Search in Google Scholar
[20] G.E.Dieter: Mechanical metallurgy, McGraw-Hill Book Company, New York (1986) pp. 29510.5962/bhl.title.35895Search in Google Scholar
[21] T.B.Massalski, H.Okamoto, P.R.Subramanian, L.Kacprzak: Binary Alloy Phase Diagrams, 2nd ed., ASM International, Ohio (1990).Search in Google Scholar
[22] Y.Q.Ma, C.B.Jiang, Y.Li, H.B.Xu, C.P.Wang, X.J.Liu: Acta Mater. 55 (2007) 1533–1541. 10.1016/j.actamat.2006.10.014Search in Google Scholar
[23] N.Lanska, O.Sōderberg, A.Sozinov, Y.Ge, K.Ullakko, V.K.Lindroos: J. Appl. Phys. 95 (2004) 8074–8078. 10.1063/1.1748860Search in Google Scholar
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