scholarly journals Signature of martensite transformation on conductivity noise in thin films of NiTi shape memory alloys

2008 ◽  
Vol 92 (11) ◽  
pp. 112110 ◽  
Author(s):  
Chandni U ◽  
Arindam Ghosh ◽  
H. S. Vijaya ◽  
S. Mohan
Keyword(s):  
Thin Films ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Transformation ◽  
Niti Shape Memory Alloys

Sensing Shape Recovery using Conductivity Noise in Thin Films of NiTi Shape Memory Alloys

2008 ◽  
Vol 1129 ◽  
Author(s):  
U. Chandni ◽  
M.V. Manjula ◽  
Arindam Ghosh ◽  
H.S. Vijaya ◽  
S. Mohan
Keyword(s):  
Thin Films ◽  
Electrical Resistivity ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Recovery ◽  
Low Frequency ◽  
Static Case ◽  
Long Range Correlations ◽  
Device Applications ◽  
Niti Shape Memory Alloys

AbstractLow frequency fluctuations in the electrical resistivity, or noise, have been used as a sensitive tool to probe into the temperature driven martensite transition in dc magnetron sputtered thin films of nickel titanium shape-memory alloys. Even in the equilibrium or static case, the noise magnitude was more than nine orders of magnitude larger than conventional metallic thin films and had a characteristic dependence on temperature. We observe that the noise while the temperature is being ramped is far larger as compared to the equilibrium noise indicating the sensitivity of electrical resistivity to the nucleation and propagation of domains during the shape recovery. Further, the higher order statistics suggests the existence of long range correlations during the transition. This new characterization is based on the kinetics of disorder in the system and separate from existing techniques and can be integrated to many device applications of shape memory alloys for in-situ shape recovery sensing.

Vacuum induction melting of NiTi shape memory alloys in graphite crucible

2007 ◽  
Vol 465 (1-2) ◽  
pp. 44-48 ◽  
Author(s):  
Niraj Nayan ◽  
Govind ◽  
C.N. Saikrishna ◽  
K. Venkata Ramaiah ◽  
S.K. Bhaumik ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Graphite Crucible ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Niti Shape Memory Alloys

Improvement of Mechanical Properties of Powder Metallurgical NiTi Shape Memory Alloys

2006 ◽  
Vol 8 (4) ◽  
pp. 247-252 ◽  
Author(s):  
J. Mentz ◽  
M. Bram ◽  
H. P. Buchkremer ◽  
D. Stöver
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Niti Shape Memory Alloys
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