Microstructures evolution and phase transformation behaviors of Ni-rich TiNi shape memory alloys after equal channel angular extrusion

Zhang, Xiaoning; Song, Jie; Huang, Chunli; Khosa, Azhar Abbas; Chen, Bin; Sun, Xiaogang; Xie, Chi

doi:10.1016/j.jallcom.2010.11.189

Cited by 29 publications

(12 citation statements)

References 44 publications

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“…After the ECAE processing, it was observed thin stress-induced martensite plates, as well as the presence of precipitates. These observations are in agreement with recent works 14,15 , the main significant microstructural changes produced by the first ECAE pass, like the increase of the high-angle grain boundaries, appearance of sub-grains structures, and shear bands.…”

Section: Resultssupporting

confidence: 93%

“…Using ECAE process [8][9][10][11][12][13][14][15][16] , some studies have been done in NiTi SMA with respect to microstructural characteristics related to the change of the direct (B2→B19') martensitic transformation to intermediate B2→R martensitic transformation.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, most of the literature discusses the martensitic transformation behavior in alloys deformed by ECAE in austenitic NiTi alloys 8,9,11,12,[14][15][16] and only a few works report on the martensitic NiTi alloys 10,13 . The present paper shows the results of martensitic NiTi alloy deformed by 1 ECAE pass and a correlation between microstructure, hardness and martensitic transformations temperatures.…”

Section: Introductionmentioning

confidence: 99%

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ECAE processed NiTi shape memory alloy

et al. 2014

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The current work evaluated the microstructures and martensitic transformation temperatures of NiTi shape memory alloy (SMA) deformed by equal channel angular extrusion (ECAE). The Ti-55.27wt.%Ni alloy was processed by 1 ECAE pass at 250 °C using a die with an intersection angle of 120°. After processing, samples were annealed at 300 °C, 400 °C and 500 °C for 1h to evaluate the microstructural changes. Microstructural characterization was performed by scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS) device, and Vickers hardness measurement. Martensitic transformations temperatures were analyzed by differential scanning calorimetry (DSC). Results show that the annealing treatments presented no significant change in the microstructure of the ECAE processed samples. Meanwhile, the DSC curves corresponding to the annealing treatments performed at 300 °C and 400 °C show two step martensitic transformation related to B2→R→B19'. For the annealing at 500 °C, the martensitic transformation temperatures returned to the ST condition, indicating a reduction of the processing defects.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ECAE processed NiTi shape memory alloy

et al. 2014

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“…It is largely known that thermoelastic martensitic play an important role in the shape memory and pseudoelasticity properties in TiNi SMAs. [7,8] Many studies have investigated the effect of thermomechanical treatments on the martensitic transformation and premartensitic R phase. [4] Under certain conditions, appropriate thermomechanical treatments [5,6] and TiNibased alloys can become more complex with the appearance of an intermediate phase called "Phase premartensitic" or "R phase".…”

Section: Introductionmentioning

confidence: 99%

Study of the applied stress on the transformation behaviour for the equiatomic shape memory alloy Ti-Ni

Chouf

Benchiheub

Belkahla

2016

Advances in Materials and Processing Technologies

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The present work aims to study the influence of the applied stress on the characteristics of the martensitic transformation. Measurements of differential scanning calorimetry (DSC) and electrical resistance (RE) were carried out for the thermal characterisation of the samples tested. Mechanical characterisation effectuated on a tensile testing machine under stress was also performed. It has been also shown that the application of stress causes an increase of the plastic deformation (martensitic and austenitic phase), which results in a two-way memory effect, which remains substantially stable regardless of the applied stress. We estimated in a qualitative manner the rate of defects is introduced during thermomechanical cycling under different constraints, a thermal cycling unconstrained in order to compare their microstructures of our samples with that of the reference one (without cycling).

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“…Recently, there were the extensive interests in the ECAE research, and many successful applications have been reported for various metal and alloy materials with ultrafine grains, such as TiNi alloys [10][11][12][13][14][15][16][17], TiAl and TiNb alloys [18,19],Ti [20][21][22], Mg and Cu alloys [23,24] etc. Among these ultrafine grain materials, Ni-rich TiNi alloys have many applications in engineering and medical fields for their superior properties, such as the shape memory effect (SME) and the pseudoelasticity (PE) [11,25].…”

Section: Introductionmentioning

confidence: 99%