Internal friction peak associated with the interface motion in the martensitic transformation of CuAlNiMnTi shape memory alloy

2007 ◽  
Vol 102 (2) ◽  
pp. 023521 ◽  
Author(s):  
C. L. Gong ◽  
F. S. Han ◽  
Z. Li ◽  
M. P. Wang
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Internal Friction ◽  
Shape Memory ◽  
Internal Friction Peak ◽  
Interface Motion

Frequency Dependence of the Internal Friction for Ti50Ni48.5Fe1.5 Shape Memory Alloy

2010 ◽  
Vol 143-144 ◽  
pp. 1007-1011
Author(s):  
Ting Yong Xing ◽  
Xu Jun Mi ◽  
Xiang Qian Yin ◽  
Bao Dong Gao ◽  
Yan Feng Li
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Internal Friction ◽  
Shape Memory ◽  
Frequency Dependence ◽  
Internal Friction Peak ◽  
Interesting Phenomenon ◽  
Measuring Frequency ◽  
Friction Measurements

The objective of this work is to investigate the influence of measuring frequency on the internal friction of Ti50Ni48.5Fe1.5 shape memory alloy. The DSC, DC electrical resistivity and internal friction measurements were employed to characterize the sample in this study. Comparing the DSC result, the two internal friction peaks were confirmed which are corresponding to the R-phase transformation and martensitic transformation of Ti50Ni48.5Fe1.5 alloy during the cooling process, respectively. The height of internal friction peak corresponding to martensitic transformation increased with decreasing of measuring frequency. But, the height of the internal friction peak corresponding to R-phase transformation exhibited little measuring frequency dependence. Meanwhile, the value of the relative modulus peaks of the specimen increased with measuring frequency increasing. Furthermore, there was an interesting phenomenon that the martensitic transformation finish temperature shifted to higher temperature side with increasing of measuring frequency. It could be associated with the variation of applied vibration energy.

Orientation Dependent Internal Friction of Textured Ti-Nb-Al Shape Memory Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 1533-1536 ◽  
Author(s):  
Y. Yamamoto ◽  
Tomonari Inamura ◽  
Kenji Wakashima ◽  
Hee Young Kim ◽  
Shuichi Miyazaki ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Internal Friction ◽  
Shape Memory ◽  
Rolling Direction ◽  
Mechanical Analysis ◽  
Martensite Phase ◽  
Tensile Direction ◽  
Heat Treated ◽  
Tan Δ

Internal friction of Ti-24mol%Nb-3mol%Al (Ti-24Nb-3Al) shape memory alloy with a well-developed texture was investigated by dynamic mechanical analysis (DMA) in a tensile mode with a frequency of 1Hz and a temperature range of 123~423K. Ti-24Nb-3Al alloy fabricated by Ar arc-melting was cold-rolled with a reduction in thickness of 99% and then heat-treated at 1173K for 3.6ks in vacuum to develop a recrystallization texture. The martensitic transformation temperature and internal friction (tan δ) were evaluated under the stress amplitude of 36MPa. The tensile direction was selected to be the rolling direction (RD) and the transverse direction (TD). The specimen was β-single phase with a well-developed {112}β<110>β texture at room temperature and exhibited high damping during martensitic transformation and in the martensite phase. The relationship between internal friction and the tensile direction is discussed on the view point of the crystallography of the transformation.

Effect of Solution Treatment on the Microstructure and Reverse Martensitic Transformation Behavior of a Novel Porous CuAlMn Shape Memory Alloy

2011 ◽  
Vol 421 ◽  
pp. 173-178
Author(s):  
Qing Zhou Wang ◽  
Chun Xiang Cui ◽  
Na Jun Yan ◽  
Qian Wang
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Internal Friction ◽  
Shape Memory ◽  
Solution Treatment ◽  
Optical Microscope ◽  
Solution Temperature ◽  
Transformation Behavior ◽  
Reverse Martensitic Transformation ◽  
Temperature Ranges

A novel porous CuAlMn shape memory alloy (SMA) has been successfully fabricated by sintering-dissolution process. Effect of solution treatment on the microstructure and the reverse martensitic transformation (MT) behavior of the resulting specimens are investigated by means of SEM, optical microscope, DSC and internal friction (IF). The results show that with increasing solution temperature, the content and the size as well as the arrangement order of martensite in matrix increase. The reverse MT behavior follows different dependences on solution temperature and solution time at different temperature ranges. The related mechanisms are discussed in terms of the changes of the content of martensite and the concentration of quenched-in vacancies.

Micro and Macromechanical Study of Stress-Induced Martensitic Transformation in a Cu-Al-Be Polycrystalline Shape Memory Alloy

2006 ◽  
Vol 509 ◽  
pp. 87-92 ◽  
Author(s):  
F.M. Sánchez ◽  
G. Pulos
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Vector Fields ◽  
Displacement Vector ◽  
Optical Microscope ◽  
Image Sequences ◽  
Tension Test ◽  
Loading Device ◽  
Stress States

An experimental investigation of the micro and macromechanical stress-induced martensitic transformation in a Cu-Al-Be polycrystalline shape memory alloy is undertaken using a uniaxial tension test. Digital images are acquired at different stress states. The image sequences are analyzed to estimate the optical flow to get displacement vector fields. The experiments are carried out on a miniature hydraulic loading device mounted under an optical microscope. The stress-strain curves and associated images show stress-induced martensitic transformation in specific grains. Displacement vector fields for the polycrystalline shape memory alloy are obtained. They are inhomogeneous due to the martensitic transformation and inter-granular interactions.

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