scholarly journals Nanoscale Mechanical Properties of Nanoindented Ni48.8Mn27.2Ga24 Ferromagnetic Shape Memory Thin Film

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Xiaofei Fu ◽  
Chao Liu ◽  
Xili Lu ◽  
Xianli Li ◽  
Jingwei Lv ◽  
...  
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Martensitic Transformation ◽  
Magnetron Sputtering ◽  
Shape Memory ◽  
Room Temperature ◽  
Shape Recovery ◽  
Recovery Ratio ◽  
Dc Magnetron Sputtering ◽  
Ferromagnetic Shape Memory

The structure and nanoscale mechanical properties of Ni48.8Mn27.2Ga24 thin film fabricated by DC magnetron sputtering are investigated systematically. The thin film has the austenite state at room temperature with the L21 Hesuler structure. During nanoindentation, stress-induced martensitic transformation occurs on the nanoscale for the film annealed at 823 K for 1 hour and the shape recovery ratio is up to 85.3%. The associated mechanism is discussed.

DC Magnetron Sputtering Deposition of Room-Temperature Phase Transition Vanadium Oxide Film

2014 ◽  
Vol 1053 ◽  
pp. 332-336 ◽  
Author(s):  
Ya Qiao ◽  
Yuan Lu ◽  
Hua Yang ◽  
Yong Shun Ling
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Magnetron Sputtering ◽  
Vanadium Oxide ◽  
Room Temperature ◽  
Annealed Film ◽  
Oxide Thin Film ◽  
Temperature Phase ◽  
Dc Magnetron Sputtering ◽  
Main Component

Low valence vanadium oxide thin film was deposited on ordinary glass substrates by direct current (DC) magnetron sputtering from a vanadium metal target. And then it was annealed in an atmosphere of oxygen/argon mixture at the temperature of 450°C for 2hours to obtain VO2thin film possessing the ability of phase transition. The XRD patterns and resistance-temperature (R-T) curves of the film before and after the annealing were given. The results show that: the as-deposited film, whose main component is V2O3, presents no phase transition and its resistance changes from 1.26 kΩ~1.01kΩ while its temperature rising from room temperature to 80°C; the annealed film, whose main component is VO2, presents a phase transition when its temperature rising from room temperature to 80°C and its resistance changes from 10kΩ to 60Ω, more than two orders. And the phase transition temperature of the film deposited is only 30°C.

Shape Memory Behavior and Mechanical Properties of NiMn and Ni(Mn,X) Alloys

1991 ◽  
Vol 246 ◽  
Author(s):  
W.S. Yang ◽  
D.E. Mikkola
Keyword(s):  
Mechanical Properties ◽  
Transition Temperature ◽  
Shape Memory ◽  
Room Temperature ◽  
Shape Recovery ◽  
Transformation Temperatures ◽  
Room Temperature Ductility ◽  
Substitutional Solute ◽  
Ternary Element ◽  
High Transition

AbstractPotential high transition temperature shape memory alloys based on NiMn have been studied with emphasis on the shape recovery, transformation temperatures and mechanical properties. Binary NiMn, which has been reported to be brittle, has a low shape recovery, but this can be increased with Al or Ti additions. Also, the transformation temperature can be changed and the room temperature ductility improved by ternary element additions. The various substitutional solute characteristics affecting the shape recovery, the transformation temperatures, and the ductility have been examined.

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