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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Compositional Dependent Crystal Structure in...

Compositional Dependent Crystal Structure in NiMnGa Matensite

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Abstract:

The effect of composition on martensitic phase transformation and structure in polycrystalline NiMnGa was investigated through Ni substitution for Mn, Ga and Mn substitution for Ga. The martensitic transformation temperatures almost linerly increase with increasing Ni content in Ni_50+xMn_50-xGa₂₅, Ni₅₀₊_yMn₂₅Ga_25-_y and Mn content in Ni₅₀Mn₂₅₊_zGa_25-_z. The increases in rate of the martensitic transformation temperatures are different for the three conditions. It is large for Ga substituted by Ni, slow for both Mn substituted by Ni and Ga substituted by Mn. Analysis shows that electronic concentration is an important factor to influence the martensitic transformation temperature in the Ni-Mn-Ga alloys. The results show that Ni excess stabilizes the NM martensitic structure and Mn excess stabilizes the 7M martensitic strcuture in broad composition range.

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Functional Materials Research II

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

244-248

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.244

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Online since:

January 2017

Authors:

Zhen Zhuang Li, Zong Bin Li*, Yi Qiao Yang, Bo Yang, Xiang Zhao, Liang Zuo

Keywords:

Composition, Martensitic Structure, Martensitic Transformation, Ni-Mn-Ga Alloys

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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