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Acta Metall Sin  2006, Vol. 42 Issue (8): 785-791     DOI:
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Influence of Sb addition on Martensitic and Magnetic Transformation in β+γ Two-phase Based Co-Ni-Al Shape Memory Alloy
Fenghua Luo
中南大学粉末冶金研究院功能材料研究所
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Fenghua Luo. Influence of Sb addition on Martensitic and Magnetic Transformation in β+γ Two-phase Based Co-Ni-Al Shape Memory Alloy. Acta Metall Sin, 2006, 42(8): 785-791 .

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Abstract  Influence of 1 at.% Sb addition on martensitic transformation and Curie point of Co41Ni32Al27 alloy is investigated for the first time by optical metallograph, SEM, EDX, XRD, DSC and VSM methods. The results show that martensitic crystal structure of Co41Ni32Al26Sb1 alloy is still L10 type. Both martensitic transformation temperature Tm and Curie point Tc is linear relation to quenching temperature. Tm increase 9K and Tc increase 7.5K for every 10K increasing in quenched temperature. Quenched from same temperature, Tm of Co41Ni32Al26Sb1 alloy is higher than that of Co41Ni32Al27 alloy by 70K，meanwhile Tc is higher by 15K. The melting point of Co-Ni-Al alloy decreases by the Sb addition, eutectic structure appears in Co41Ni32Al26Sb1 alloy annealed at 1623K, indicated that the alloy is partial melted. The martensitic transformation temperature range of Co41Ni32Al26Sb1 alloy is 20-28K, less than half that of Co41Ni32Al27 alloy. This is a very important result to benefit the achievement of large magnetic field induced strain on Co-Ni-Al based alloy. The results of Tm and Tc were explained by total average s+d electron concentration and magnetic valence number Zm separately.
Key words:  Co-Ni-Al-Sb alloy      martensitic transformation      Curie point      
Received:  14 November 2005     
ZTFLH:  TG139.6  
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