Shape memory properties of Cu-based thin tapes obtained by rapid solidification methods

Relationship between grain size and thermal hysteresis of martensitic transformations in Cu-based shape memory alloys

“…Melt spinning (MS) and twin-roll casting (TRC) are suitable techniques to develop SMA Cu-based materials with columnar grains sizes ranging between 500 nm and 30 lm in section [25][26][27][28]. In this work, ribbons and sheets 50lm and 300lm thick were obtained by MS and TRC respectively.…”

Preparation of Cu–Al–Ni shape memory alloy strips by spray deposition-hot rolling route

“…Further, the alloys produced inherits homogenous grain size due to the rapid cooling rate and exhibits fine grain structure that does not require further thermo-mechanical treatment like conventional casting route. Attempts are made to develop Cu-Al-Ni SMA by rapid solidification processing adopting melt spinning and twin roll casting routes from the molten Cu-Al-Ni alloy [17][18][19][20][21]. However, the rapid solidification process suffers from the disadvantage of degraded shape memory effect in subsequent cycles and exhibits lower recoverable strains.…”

Microstructural evolution and mechanical response of Cu–Al–Be–B shape memory alloy processed by repetitive equal channel angular pressing

“…These shortcomings are partially due to their microstructural characteristics [4,5], such as coarse grain sizes and the congregation of secondary phases or impurities along the grain boundaries. Some researches have been carried out to refine the grain size or clean the grain boundary, for example, heat treatment, powder metallurgy, and rapid solidification techniques were developed to fabricate fine-grained copper-based SMAs [2,3,[6][7][8] and single crystal alloys [9]. The performances of the alloys prepared by these methods have all improved in different degrees, but they still cannot be efficiently applied because of the complex preparations or shape limit (line or strip).…”