Abstract
In order to improve the mechanical properties and phase transition temperature, the influence of Gd doping on the microstructure, phase transition temperature and mechanical properties of Co35Ni32Al33 alloy was investigated. The results show that the γ+β phase was observed in the microstructure of the sample with less Gd doping and the γ phase+martensite was found with more Gd content. The phase transition temperature apparently increases with Gd doping and the phase transition temperature goes over room temperature when the Gd is 3 at.% or more. With increasing Gd doping, more γ phase appears in the sample which results in decrease in hardness. The compressive strength decreases from 2274 to 1630 MPa and the ductility increase from 4.2 to 12.9% with increasing Gd content.
Highlights
Since the first observation of the magnetic field induced strain in Ni2MnGa by Ullakko [1], the ferromagnetic shape memory alloys (FSMAs) have attracted a great attention as a kinds of intelligent material for actuator and sensor
In the FSMAs family, Co-Ni-Al alloy, as a potential material for actuators and sensors, can overcome the low phase transition temperature and poor mechanical properties barriers depending on their microstructures and wide range phase transition temperature [11]
In order to improve the mechanical properties and phase transition temperature, different amount of Gd was doped in Co35 Ni32 Al33 FSMAs
Summary
Since the first observation of the magnetic field induced strain in Ni2MnGa by Ullakko [1], the ferromagnetic shape memory alloys (FSMAs) have attracted a great attention as a kinds of intelligent material for actuator and sensor. The actuator and sensor made of FSMAs did not get a wide range of applications due to their low phase transition temperature and poor mechanical properties [10]. In the FSMAs family, Co-Ni-Al alloy, as a potential material for actuators and sensors, can overcome the low phase transition temperature and poor mechanical properties barriers depending on their microstructures and wide range phase transition temperature [11]. The phase transition temperature of Co-Ni-Al is sensitive to material composition, especially magnetic elements [13,14,15]. In this case, the Co-Ni-Al alloy with excellent
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