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Licensed Unlicensed Requires Authentication Published by De Gruyter January 11, 2014

Effect of rare earth Y addition on two-phase Ni53Mn22Co6Ga19 high-temperature shape memory alloy

  • Xinquan Jiao , Shuiyuan Yang and Yu Su


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.

* Correspondence address, Assist. Prof. Shuiyuan Yang, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P. R. China, Tel.: +86-18059243800, Fax: +86-592-2187966, E-mail:


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Received: 2013-04-09
Accepted: 2013-07-27
Published Online: 2014-01-11
Published in Print: 2014-01-09

© 2014, Carl Hanser Verlag, München

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