On Deformation of A-M Interface in Single Crystal Shape Memory Alloys and Some Related Issues

1999 ◽  
Vol 121 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Qing-Ping Sun ◽  
Terry Ting Xu ◽  
Xiangyang Zhang
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Single Crystal ◽  
Shape Memory ◽  
Deformation Field ◽  
Experimental Results ◽  
Crystal Shape ◽  
Invariant Plane ◽  
Experimental Discovery ◽  
Deformation Features

Recent experimental results on the deformation field of single crystal CuNiAl shape memory alloys (SMA) by using Moire´ interference technique are reported and two kinds of austenite-martensite (A-M) interfaces with different deformation features are identified. The experimental discovery questioned the invariant plane hypothesis used in crystallographic theory of martensitic transformation. Some fundamental issues on the property of A-M interface and the related micro- and macro-deformation features are discussed.

A Quantitative Micro-Deformation Field Study of Shape Memory Alloys by High Sensitivity Moiré

1996 ◽  
Vol 459 ◽  
Author(s):  
Q. P. Sun ◽  
Terry T. Xu ◽  
X. Y. Zhang ◽  
P. Tong
Keyword(s):  
Single Crystal ◽  
Shape Memory ◽  
Deformation Behavior ◽  
Lattice Distortion ◽  
High Sensitivity ◽  
Tensile Specimen ◽  
Deformation Field ◽  
Uniaxial Tensile ◽  
Deformation Features ◽  
Micro Deformation

ABSTRACTQuantitative micro-macro combined experimental research on the deformation field of single crystal CuAINi shape memory alloy (SMA) is performed by using high sensitivity Moiré technique. The study is focused on the micro-macro correspondence of the deformation behavior of single crystal uniaxial tensile specimen during stress induced forward and reverse transformations. The aim of the experiment is to quantitatively relate the macroscopic applied stress with the deformation field in the mesoscale. The large deformation due to the lattice distortion during transformation was first successfully recorded by Moiré interferometry. Some important microstructure-related deformation features of single crystal SMA under uniaxial tension are first reported.

On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys

2018 ◽  
Vol 725 ◽  
pp. 51-56 ◽  
Author(s):  
E. Acar ◽  
H. Tobe ◽  
H.E. Karaca ◽  
I. Chumlyakov
Keyword(s):  
Shape Memory Alloys ◽  
Single Crystal ◽  
Shape Memory ◽  
Crystal Shape

Phase quantification during pseudoelastic cycling of Cu–13.1Al–4.0Ni (wt.%) single-crystal shape memory alloys using neutron diffraction

2008 ◽  
Vol 56 (17) ◽  
pp. 4724-4738 ◽  
Author(s):  
Ganesh K. Kannarpady ◽  
Abhijit Bhattacharyya ◽  
Mike Wolverton ◽  
Donald W. Brown ◽  
Sven C. Vogel ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Shape Memory Alloys ◽  
Single Crystal ◽  
Shape Memory ◽  
Crystal Shape ◽  
Phase Quantification

scholarly journals A micromechanical model for single-crystal shape-memory-alloys

PAMM ◽  
2004 ◽  
Vol 4 (1) ◽  
pp. 298-299 ◽  
Author(s):  
Thorsten Bartel ◽  
Klaus Hackl
Keyword(s):  
Shape Memory Alloys ◽  
Single Crystal ◽  
Shape Memory ◽  
Micromechanical Model ◽  
Crystal Shape

Martensitic Transformation in Submicron Cu-Al-Ni Pillar

2013 ◽  
Vol 1581 ◽  
Author(s):  
Lifeng Liu ◽  
Yumei Zhou ◽  
Lan Lv
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Single Crystal ◽  
Shape Memory ◽  
Sample Size ◽  
Small Scale ◽  
Bulk Materials ◽  
Stress Curve ◽  
Strain Stress

ABSTRACTThe transformation plateau on the strain-stress curve is the characteristic of superelasticity of bulk shape memory alloys upon tension/compression loading. However, recent studies show that such transformation plateau is hard to see when the sample size of shape memory alloys decreases to submicrons. In order to see what happened in such small scale samples during loading, in-situ compression test has been done with single crystal Cu-14.2Al-4.0Ni (wt %) submicron pillars. Our in-situ observation during compression demonstrates that the stress-induced martensitic transformation indeed occurs in submicron pillars, but is not suppressed. Furthermore, the transformation proceeds in a sequential nucleation-growth-nucleation dominated mode, but not the transient way like that in bulk materials. As a result, the stress keeps increasing throughout the transformation and no obvious transformation plateau can be detected. However, the underlying reason for such contrast transformation behaviors between our submicron pillars and bulk materials still needs further investigation.

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