Stress-induced martensitic transformations in a Cu–Al–Ni shape memory alloy studied by in situ transmission electron microscopy

2008 ◽  
Vol 481-482 ◽  
pp. 457-461 ◽  
Author(s):  
N. Zárubová ◽  
J. Gemperlová ◽  
V. Gärtnerová ◽  
A. Gemperle
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensitic Transformations ◽  
Transmission Electron

In situ Transmission Electron Microscopy and Nanoindentation Studies of Phase Transformation and Pseudoelasticity of Shape-memory Titanium-nickel Films

2005 ◽  
Vol 20 (7) ◽  
pp. 1808-1813 ◽  
Author(s):  
X.-G. Ma ◽  
K. Komvopoulos
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Transformation ◽  
Shape Memory ◽  
Heating And Cooling ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Titanium Nickel ◽  
In Situ Heating

Transmission electron microscopy (TEM) and nanoindentation, both with in situ heating capability, and electrical resistivity measurements were used to investigate phase transformation phenomena and thermomechanical behavior of shape-memory titanium-nickel (TiNi) films. The mechanisms responsible for phase transformation in the nearly equiatomic TiNi films were revealed by heating and cooling the samples inside the TEM vacuum chamber. Insight into the deformation behavior of the TiNi films was obtained from the nanoindentation response at different temperatures. A transition from elastic-plastic to pseudoelastic deformation of the martensitic TiNi films was encountered during indentation and heating. In contrast to the traditional belief, the martensitic TiNi films exhibited a pseudoelastic behavior during nanoindentation within a specific temperature range. This unexpected behavior is interpreted in terms of the evolution of martensitic variants and changes in the mobility of the twinned structures in the martensitic TiNi films, observed with the TEM during in situ heating.

Transmission electron microscopy of twins in martensite in TiPd shape memory alloy

1997 ◽  
Vol 45 (11) ◽  
pp. 4847-4853 ◽  
Author(s):  
M. Nishida ◽  
T. Hara ◽  
Y. Morizono ◽  
A. Ikeya ◽  
H. Kijima ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Transmission Electron
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