EFFECT OF ALLOYING ON MICROSTRUCTURE AND SHAPE MEMORY CHARACTERISTICS OF CU-ZN-NI SHAPE MEMORY ALLOYS
Keywords:
Cu–Zn–Ni shape Memory Alloy, Transformation Temperature , Shape Memory EffectAbstract
Ni-Ti and Cu–based shape memory alloys, such as Cu-Zn-Al and Cu-Al-Ni, are presently available for commercial use in shape memory applications. Ni-Ti shape memory alloys exhibit better shape memory properties and good corrosion resistance than Cu-based shape memory alloys (SMAs). However Ni-Ti in finished form is very expensive because of fabrication difficulties associated with melting and forming. In many applications, Cu-based shape memory alloys provide a more economical alternative to Ni-Ti shape memory alloys in terms of melting and designing into desired form. Cu-Zn-Ni shape memory alloys in the range of 38- 55 wt. % of Zinc and 0- 15 wt % of nickel, exhibit β- phase at high temperature, the alloys upon quenching high temperature to lower temperatures undergoes a martensite transformation manifesting shape memory effect. In the present study Cu-Zn-Ni alloys in the above said range are prepared through ingot metallurgy route on argon atmosphere. The characterization of the alloys revealed the formation martensite phase exhibited good ductility and shape memory effect. The results are given and discussed in detail.
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References
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