Title of article :
Twin relationships of 5M modulated martensite in Ni–Mn–Ga alloy Original Research Article
Author/Authors :
Zongbin Li، نويسنده , , YUDONG ZHANG، نويسنده , , Claude Esling، نويسنده , , Xiang Zhao، نويسنده , , LIANG ZUO، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2011
Pages :
8
From page :
3390
To page :
3397
Abstract :
For Ni–Mn–Ga ferromagnetic shape memory alloys, the characteristic features of modulated martensite (including the number/shape of constituent variants, the inter-variant orientation relationship and the geometrical distribution of variant interfaces) determine the attainability of the shape memory effect. In the present work, a comprehensive microstructural and crystallographic investigation has been conducted on a bulk polycrystalline Ni50Mn28Ga22 alloy. As a first attempt, the orientation measurements by electron backscatter diffraction (EBSD) – using the precise information on the commensurate 5M modulated monoclinic superstructure (instead of the conventionally simplified non-modulated tetragonal structure) – were successfully performed to identify the crystallographic orientations on an individual basis. Consequently, the morphology of modulated martensite, the orientation relationships between adjacent variants and the characters of twin interfaces were unambiguously determined. With the thus-obtained full-featured image on the configuration of martensitic variants, the possibility of microstructural modification by proper mechanical “training” was further discussed. This new effort makes it feasible to explore the crystallographic/microstructural correlations in modulated martensite with high statistical reliability, which in turn provides useful guidance for optimizing the microstructure and shape memory performance.
Keywords :
Orientation relationship , Ni–Mn–Ga alloys , Electron backscatter diffraction (EBSD) , Twin interface , Modulated martensite
Journal title :
ACTA Materialia
Serial Year :
2011
Journal title :
ACTA Materialia
Record number :
1145601
Link To Document :
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