Deformation Induced Phase Seperation of Ni₄₅Co₅ Mn_36.7In_13.3 Alloy at High Temperature

Abstract:

NiMnCoIn alloys are new-type magnetic shape memory alloys (MSMAs) in which a reversible magnetic-field-induced phase transformation was observed. They are ideal candidates of materials used in actuators and sensors. The polycrystalline NiMnCoIn alloys are generally brittle so that they can not be easily deformed into the shape applicable to actuators and sensors until now. In the present paper, the influence of hot deformation on the microstructure of Ni₄₅Co₅ Mn_36.7In_13.3 alloy was studied. The experimental results showed that second phase was observed after deformation at high temperature between 800~900 °C and at strain rate lower than 4×10^-3s^-1. The content of Co of second phase was higher than the matrix alloy, while the content of In was lower than the matrix alloy. It was determined by TEM measurements as γ phase with fcc structure which was popular in NiFeGa and NiMnGaCo alloys. It is possible to improve the ductility of Ni₄₅Co₅Mn_36.7In_13.3 alloy by control of amount and distribution of γ phase by hot deformation.

• Periodical: Materials Science Forum (Volumes 702-703)
• Pages: 896-899
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.702-703.896
• Online since: December 2011
• Authors: Gang Wang, Chun Yan Wang, Zhe Chen, Wen Ru Zhao, Yan Dong Liu, Yan Dong Wang, Liang Zuo
• Keywords: Hot Deformation, NiMnCoIn Alloy, Second Phase, Structure, Temperature

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