IN SITU STUDY OF MARTENSITE TRANSFORMATION , PLASTIC DEFORMATION AND CRACK NUCLEATION FOR NI2MNGA FERROMAGNETIC SHAPE MEMORY ALLOY

Acta Metall Sin

2006, Vol. 42

Issue (8): 810-814 DOI:

Research Articles

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IN SITU STUDY OF MARTENSITE TRANSFORMATION , PLASTIC DEFORMATION AND CRACK NUCLEATION FOR NI2MNGA FERROMAGNETIC SHAPE MEMORY ALLOY

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北京科技大学

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. IN SITU STUDY OF MARTENSITE TRANSFORMATION , PLASTIC DEFORMATION AND CRACK NUCLEATION FOR NI2MNGA FERROMAGNETIC SHAPE MEMORY ALLOY. Acta Metall Sin, 2006, 42(8): 810-814 .

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Abstract The interrelationship of crack nucleation to martensite transformation and plastic deformation has been studied in situ using a differential interference constrast (DIC) microscopy for a notched sample of Ni2MnGa ferromagnetic shape memory alloy . The result showed that martensites form firstly during loading and there was a plastic zone when stress concentration ahead of a crack is large enough . Microcrack initiated preferentially along the interface of martensite , but also initiated in the plastic zone . With increasing the load , microcracks initiated discontinuously along the martensites and connected through shear microcracks in the ligaments , resulting in a resistance curve increase behavior .

Key words: Ni2MnGa in situ tension martensite plastic zone crack initiation

Received: 05 December 2005

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