Influence of Cu Doping on Martensitic and Magnetic Transitions in Ni-Mn-Sn Alloys

Abstract:

In this work, the fourth element Cu was introduced to substitute Ni in polycrystalline Ni-Mn-Sn alloys. It was shown that Cu doping did not change the crystal structure of the martensite in Ni_50-xCu_xMn₃₉Sn₁₁ (x=0, 1, ......,7) alloys, but resulted in the decrease of martensitic transformation temperatures. Due to the higher atomic radius of Cu with respect to that of Ni, the lattice volume of martensite unit cell increases with the gradual substitution of Ni by Cu. For the alloys with the Cu content of 0-4%, the martensitic transformation is from weak magnetic (paramagnetic) austenite to weak magnetic (paramagnetic) martensite. When the Cu content is higher than 4%, the paramagnetic to ferromagnetic transition of austenite was introduced. The temperature interval between magnetic transition and structural transformation was enlarged with the increase of Cu content. Due to the relatively smaller magnetization difference between austenite and martensite, the field induced inverse martensitic transformation behavior is not significant in the present Cu-doped alloys.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 1123-1128
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.1123
• Online since: November 2016
• Authors: Zong Bin Li*, Bo Yang, Yu Dong Zhang, Claude Esling, Xiang Zhao, Liang Zuo
• Keywords: Alloying, Magnetic Transition, Martensitic Transformation, Ni-Mn-Sn Alloys

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