Effect of Equal Channel Angular Pressing and Repeated Rolling on Structure, Phase Transformations and Properties of TiNi Shape Memory Alloys

2006 ◽  
Vol 503-504 ◽  
pp. 539-544 ◽  
Author(s):  
Vladimir Pushin ◽  
Ruslan Valiev ◽  
Yuntian T. Zhu ◽  
Sergey Prokoshkin ◽  
Dmitriy Gunderov ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Martensite Transformation ◽  
Recovery Stress ◽  
Angular Pressing ◽  
Reverse Strain ◽  
Structure Phase ◽  
Shape Memory Properties

The nanostructured TiNi-based shape-memory alloys were synthesized by multi-step SPD deformations – ECAP plus cold rolling or drawing. It is found that the SPD processing changed the morphology of the martensite and temperature of martensite transformation. Also, we found that the mechanical and shape memory properties can be enhanced by forming nanostructures in these alloys. SPD processing renders higher strength, higher yield dislocation strength and in results - higher recovery stress and maximum reverse strain of shape memory.

Effect of Equal Channel Angular Pressing and Repeated Rolling on Structure, Phase Transformations and Properties of TiNi Shape Memory Alloys

2006 ◽  
pp. 539-544 ◽  
Author(s):  
Vladimir Pushin ◽  
Ruslan Z. Valiev ◽  
Yuntian T. Zhu ◽  
Sergey D. Prokoshkin ◽  
Dmitry V. Gunderov ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Structure Phase

Deformability and Shape Memory Properties in Ti50Ni50 Rolled with Electric Current

2013 ◽  
Vol 738-739 ◽  
pp. 383-387
Author(s):  
Anna A. Potapova ◽  
Vladimir V. Stolyarov
Keyword(s):  
Cold Rolling ◽  
Shape Memory ◽  
Electric Current ◽  
Martensitic Transformations ◽  
Recovery Stress ◽  
Three Point Bending ◽  
Electroplastic Rolling ◽  
Recovery Strain ◽  
Shape Memory Properties ◽  
A Current

It is shown that deformability of Ti50.0Ni50,0 alloy at the rolling with current is considerably above than at the cold rolling. The influence of deformation with a current and without a current on feature of martensitic transformations was investigated. Recovery strain and recovery stress were studied on heating the sample subjected to preliminary strain by a three-point bending and optimal regimes of electroplastic rolling were defined.

Microstructure, thermomechanical and shape memory properties of two-phase Ni–Mn–Fe–Ga high-temperature shape memory alloys with B addition

2013 ◽  
Vol 37 ◽  
pp. 1-6 ◽  
Author(s):  
Shuiyuan Yang ◽  
Cuiping Wang ◽  
Zhan Shi ◽  
Xingjun Liu
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Two Phase ◽  
Shape Memory Properties

scholarly journals Microstructure and Phase Transformation Analysis of Ni50−xTi50Lax Shape Memory Alloys

Crystals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 345 ◽  
Author(s):  
Weiya Li ◽  
Chunwang Zhao
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Transformation ◽  
Transformation Behavior ◽  
Ni Content ◽  
Start Temperature

The microstructure and martensitic transformation behavior of Ni50−xTi50Lax (x = 0.1, 0.3, 0.5, 0.7) shape memory alloys were investigated experimentally. Results show that the microstructure of Ni50−xTi50Lax alloys consists of a near-equiatomic TiNi matrix, LaNi precipitates, and Ti2Ni precipitates. With increasing La content, the amounts of LaNi and Ti2Ni precipitates demonstrate an increasing tendency. The martensitic transformation start temperature increases gradually with increasing La content. The Ni content is mainly responsible for the change in martensite transformation behavior in Ni50−xTi50Lax alloys.

A Comparative Study of Structure Formation in Thermomechanically Treated Ti-Ni and Ti-Nb-(Zr, Ta) SMA

2012 ◽  
Vol 706-709 ◽  
pp. 1931-1936 ◽  
Author(s):  
Sergey Prokoshkin ◽  
Vladimir Brailovski ◽  
Karine Inaekyan ◽  
Andrey Korotitskiy ◽  
Sergey Dubinskiy ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Comparative Study ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Structure Formation ◽  
Thermomechanical Treatment ◽  
Functional Properties ◽  
Nanocrystalline Structure ◽  
Technological Factors

The processes of structure formation in Ti-Ni and in Ti-Nb-Zr, Ti-Nb-Ta shape memory alloys (SMA) under thermomechanical treatment (TMT) were studied. The TMT comprised cold rolling with true strains from e=0.25 to 2 and post-deformation annealing. Differences in these processes between two groups of alloys are considered. The main conclusions are as follows: nanostructures created by TMT are useful for radical improvement of the SMA functional properties, and an optimum nanostructure (nanocrystalline structure, nanosubgrained structure or theirmixture) should be selected by taking into account other structural and technological factors.

scholarly journals Phase Equilibria and Phase Transformations in New B2-type Ferromagnetic Shape Memory Alloys of Co-Ni-Ga and Co-Ni-Al Systems

2001 ◽  
Vol 42 (11) ◽  
pp. 2472-2475 ◽  
Author(s):  
Katsunari Oikawa ◽  
Takuya Ota ◽  
Fumihiko Gejima ◽  
Toshihiro Ohmori ◽  
Ryosuke Kainuma ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phase Transformations ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory

Effect of Si doping on microstructure and martensite transformation in Ni-Mn-Sb ferromagnetic shape memory alloys

2018 ◽  
Vol 97 ◽  
pp. 1-7 ◽  
Author(s):  
Ruochen Zhang ◽  
Xuexi Zhang ◽  
Mingfang Qian ◽  
Jianfei Sun ◽  
Lin Geng
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Transformation ◽  
Ferromagnetic Shape Memory Alloys ◽  
Si Doping ◽  
Ferromagnetic Shape Memory

Smart polyimide with recovery stress at the level of high temperature shape memory alloys

2021 ◽  
Vol 30 (3) ◽  
pp. 035027
Author(s):  
Deyan Kong ◽  
Jie Li ◽  
Anru Guo ◽  
Jianxin Yu ◽  
Xinli Xiao
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Recovery Stress
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