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Acta Metall Sin  2005, Vol. 41 Issue (7): 680-684     DOI:
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Martensitic Transformation and Magnetic Transition of Co41Ni32Al27-xSix Alloy
LUO Fenghua; OIKAWA Katsunari; ISHIDA Kiyohito
State Key Laboratory for Powder Metallurgy; Central South University; Changsha 410083
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LUO Fenghua; OIKAWA Katsunari; ISHIDA Kiyohito. Martensitic Transformation and Magnetic Transition of Co41Ni32Al27-xSix Alloy. Acta Metall Sin, 2005, 41(7): 680-684 .

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Abstract  The effects of Si on the martensitic transformation and magnetic transition of Co41Ni32Al27-xSix alloys were investigated by optical micrography, DSC and VSM methods. The structure type of martensitic phase was determined by X--ray diffraction. Martensitic transformation temperatures of Co41Ni32Al27 alloys are obviously elevated by the substitute of Si for Al element, the addition of 1% Si can increase the martensitic transformation temperature by about 50 K. Curie points are also increased with increasing of Si content, 1% Si can increase the Curie temperature by 10 K. Martensites are all of ordered L10structure, but the unit cell volumes are decreased with increasing Si content. The reason for above results were discussed.
Key words:  ferromagnetic shape memory alloy      Co--Ni--Al--Si alloy      
Received:  25 November 2004     
ZTFLH:  TG139.6  

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I7/680

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