Abstract
The microstructure, martensitic transformation behavior and shape memory effect of Cu-Zn-Ni shape memory alloy have been studied by X-ray diffraction (XRD), optical microscopy (OM) and differential scanning calorimetry (DSC). The results show that the recrystallization occurs in the hot-rolled Cu-Zn-Ni alloy by annealing at 800℃ and alloy is primarily composed of martensite. A reverse martensite transformation temperature higher than 100℃ upon heating has been detected. The alloys exhibit good ductility and shape memory effect (SME). The results obtained are discussed in detail.
Highlights
A shape memory alloy (SMA) is an alloy that remembers its original shape returning the pre-deformed shape upon heating
1) The type and amount of martensite formed in these alloys are mainly dependent upon the amount of Zinc and Nickel in the alloys. β1′ martensitic phase is predominant in the composition range of the alloys chosen
Two kinds of martensites are observed in these alloys i.e. β11 martensite and γ1′ martensite with high density of twins
Summary
A shape memory alloy (SMA) is an alloy that remembers its original shape returning the pre-deformed shape upon heating. This material is a lightweight, solid-state alternative to conventional actuators such as hydraulic, pneumatic, and motor-based systems. Shape memory alloys find applications in industries such as medical, robotics and aerospace. Shape memory alloys (SMAs) are metallic materials, which exhibit two unique properties namely, shape memory effect and super-elasticity. Among many alloy systems which exhibit shape memory effect (SME), Cu-Al-Ni and Cu-Zn-Al shape memory alloys (SMAs) have been studied extensively over the years [1]. Cu-Al-Ni and Cu-Zn-Al shape memory alloys in the polycrystalline state are brittle and
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