Properties of rapidly annealed Ti50Ni25Cu25 melt-spun ribbon

Shape memory characteristics of as-spun and annealed Ti51Ni49 crystalline ribbons

“…Recently, melt-spinning technique has been utilized to fabricate amorphous or crystalline Ti-Ni binary and Ti-Ni-Cu ternary SMA ribbons for various applications. Among them, Ti 50 Ni 25 Cu 25 ribbon was widely studied because of its unique properties, such as small transformation hysteresis, low flow stress level in the martensite state, low sensitivity of the martensitic transformation start (Ms) temperature and easy fabrication for fully amorphous melt-spun ribbons [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These advantages make Ti 50 Ni 25 Cu 25 ribbon a good candidate for applications, such as actuator and sensor that require short response time at thermal cycle.…”

“…Several literatures have reported the annealing effect on the microstructures, textures, martensitic transformations, shape memory properties and crystallization kinetics of melt-spun Ti 50 Ni 25 Cu 25 ribbon [13][14][15][16]. Nevertheless, it is very difficult to control the appropriate annealing conditions for Ti 50 Ni 25 Cu 25 ribbon [17,18].…”

Pseudoelasticity response of aged Ti50Ni25Cu25 shape memory ribbon under nanoindentation tests

“…Because amorphous Ti 50 Ni 25 Cu 25 ribbon can be obtained at the as-spun condition, the crystallization behavior of the ribbon has been investigated [20,22]. Many researchers have also carefully investigated the effects of heat-treatment/crystallization temperatures on the properties of the ribbon, including transformation behavior [17,23], microstructure [18,24] and two-way SME [25,26]. Shelyakov et al [27,28] chose Ti 50 Ni 25 Cu 25 ribbons for MEMS application.…”

“…Shelyakov et al [27,28] chose Ti 50 Ni 25 Cu 25 ribbons for MEMS application. However, most studies on Ti 50 Ni 25 Cu 25 ribbons were focused on SME property [26,29e32], while those on PE property were limited [17,33], in which the macro-scale PE behavior exhibited in the entire ribbon was investigated. To further understand the micro-/nano-scale PE property of Ti 50 Ni 25 Cu 25 ribbons, a nanoindenter should be employed.…”

Crystallization behavior of a Ti50Ni25Cu25 melt-spun ribbon

“…The as-spun ribbons are fully or partially amorphous depending on the melt-spinning process and composition, which require further annealing for crystallization in order to achieve the desired SME [7][8][9]. It is well known that SME is affected by microstructure, such as grain size [10,11] and precipitates [12,13].…”