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| The preferred orientation and microstructure changes in directionally solidified Co-Ni-Ga ferromagnetic shape memory alloys |
| Hua Xie;; |
| 上海交通大学 |
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Cite this article:
Hua Xie. The preferred orientation and microstructure changes in directionally solidified Co-Ni-Ga ferromagnetic shape memory alloys. Acta Metall Sin, 2007, 43(4): 417-421 .
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Abstract The directionally solidified Co-Ni-Ga ferromagnetic shape memory alloys were prepared by liquid metal cooling method. The preferred orientation and microstructure evolution of crystals under different growth velocity were investigated. The results indicate that keeping the temperature gradient GL=250K/cm, when the growth velocity was 0.9mm/min, a preferred orientation <110> was obtained and the worm-like second phase γ′ precipitated in the martensite matrix which was found to be coarsening along the solidification direction; While the growth velocity was increased to 9mm/min, a <110>+ <001>+<211> mixed orientation was obtained, and the single martensite phase was observed in this case. No obvious macro-segregation was detected based on the results of energy dispersive spectrometer. The paper proposes a new method to fabricate the ferromagnetic shape memory polycrystals with preferred orientation.
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Received: 21 July 2006
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