scholarly journals Superelasticity Evaluation of the Biocompatible Ti-17Nb-6Ta Alloy

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Alaa Keshtta ◽  
Mohamed A.-H. Gepreel
Keyword(s):  
Fracture Surface ◽  
Cold Rolling ◽  
Shape Memory ◽  
Tensile Testing ◽  
Martensite Phase ◽  
Healthcare Applications ◽  
Ti Alloys ◽  
Alloy Microstructure ◽  
Two Phases ◽  
Rolling Deformation

Recently, studying the shape memory effect of the biocompatible Ti alloys takes much attention in the biomedical and healthcare applications. This study concerns about characterizing the superelasticity of the new biocompatible Ti-17Nb-6Ta (TNT) alloy. Microstructure of TNT was observed using optical and confocal microscopes. The alloy consists of two phases: β (predominant phase) and α″ martensite phase. The influence of cold rolling deformation on the microstructure was illustrated in which the martensitic-induced transformation appeared by cold rolling. The alloy is ductile as only the fracture dimples appeared in its fracture surface. Multicyclic loading and deloading tensile testing was applied to TNT specimens (flat and wire shapes) in order to evaluate the superelasticity. A superelastic strain as high as 3.5% was recorded for this TNT alloy. Therefore, TNT alloy has high potential for many biomedical and healthcare applications.

A Constitutive Description for Shape Memory Alloys with Phase Transformation Microstructure

2011 ◽  
Vol 52-54 ◽  
pp. 192-197
Author(s):  
Wei Guo Li ◽  
Xiang He Peng ◽  
Wen Li Pi
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Phase ◽  
Experimental Results ◽  
Niti Shape Memory Alloy ◽  
Element Analysis ◽  
Proposed Model ◽  
The Finite Element Analysis ◽  
Two Phases ◽  
Incremental Form

An incremental form of constitutive model is proposed for shape memory alloys using the modified strain based on experimental results and the finite element analysis, taking into account of the laminar microstructure, the thickness of martensite phase lamina and the interaction between the two phases. The pseudoelastisity of NiTi shape memory alloy micro-tube subjected to pure tension and pure torsion are analyzed and compared with the experimental results respectively. It can be seen that the pseudoelastic behavior, especially the stress drop during tension processes, can be well described with the proposed model.

Invar-type effect induced by cold-rolling deformation in shape memory alloys

2002 ◽  
Vol 80 (23) ◽  
pp. 4348-4350 ◽  
Author(s):  
R. Kainuma ◽  
J. J. Wang ◽  
T. Omori ◽  
Y. Sutou ◽  
K. Ishida
Keyword(s):  
Cold Rolling ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Rolling Deformation ◽  
Invar Type

Mechanical Behaviour of Ausformed and Marformed Ti-Rich Ni-Ti Shape Memory Alloys

2008 ◽  
Vol 587-588 ◽  
pp. 635-639
Author(s):  
Andersan S. Paula ◽  
Karimbi Koosappa Mahesh ◽  
C.M.L. Santos ◽  
Francisco Manuel Braz Fernandes ◽  
C.S.C. Viana
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Shape Memory ◽  
Mechanical Behaviour ◽  
Martensite Phase ◽  
Nickel Titanium ◽  
Mechanical Working ◽  
Ti Alloys ◽  
Heat Treated ◽  
History Of

Shape memory effect (SME) in Nickel-Titanium (Ni-Ti) alloys is ascribed to the thermoelastic reversible martensite phase transformation. Phase transformation is established to be affected by the pre- thermal and mechanical history of the alloy. The present work deals with the effect of mechanical working, known as ‘marforming’ and ‘ausforming’, on the phase transformation characteristics and mechanical behaviour of Ti-rich Ni-Ti alloy. Tensile study and measurement of the hardness data were carried out at room temperature. Mere heat treatment or heat treatment at 773 K after the marforming shows similar characteristics, whereas, the as-received and the ausformed samples exhibit different behaviours. Hardness numbers of the heat treated samples are found to be smaller than those of the as-received and mechanically worked samples.

Tailoring elastic admissible strain of TiZr alloy by cold rolling deformation

2019 ◽  
Vol 781 ◽  
pp. 504-507 ◽  
Author(s):  
G.S. Zhang ◽  
Q. Zhang ◽  
K.F. Li ◽  
Y.B. Cao ◽  
M. Li ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Rolling Deformation

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.

Effect of Electroplastic Deformation on Martensitic Transformation in Coarse Grained and Ultrafine Grained Ni-Ti Shape Memory Alloy

2008 ◽  
Vol 584-586 ◽  
pp. 127-132 ◽  
Author(s):  
Anastasia E. Sergeeva ◽  
Daria Setman ◽  
Michael Zehetbauer ◽  
Sergey Prokoshkin ◽  
Vladimir V. Stolyarov
Keyword(s):  
Differential Scanning Calorimetry ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Cold Rolling ◽  
Shape Memory ◽  
Coarse Grained ◽  
Scanning Calorimetry ◽  
Structure Relaxation ◽  
Differential Scanning Calorimetry Method ◽  
Ultrafine Grained

The aim of this paper is the investigation of electroplastic deformation (EPD) and subsequent annealing influence on martensitic transformation in the shape memory Ni50.7Ti49.3 alloy. Using differential scanning calorimetry method it was shown that EPD at the low strain stimulates structure relaxation and recovers martensitic transformation in cooling, which is usually suppressed by cold rolling.

scholarly journals Multiscale study of cold-rolling deformation on mechanical and corrosion behaviors of AA2024-T4 aluminum alloy

2021 ◽  
pp. 100307
Author(s):  
Sofia Benamirouche ◽  
Abderrezak Abdi ◽  
Larbi Hemmouche ◽  
Alberto Mejias ◽  
Mohamed El Amine Belouchrani ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Cold Rolling ◽  
Corrosion Behaviors ◽  
Rolling Deformation

scholarly journals EVALUASI BESAR BUTIR TERHADAP SIFAT MEKANIS CuZn70/30 SETELAH MENGALAMI DEFORMASI MELALUI CANAI DINGIN

POROS ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 58
Author(s):  
Riyan Sanjaya ◽  
Eddy S Siradj
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Tensile Test ◽  
Tensile Testing ◽  
Rolling Process ◽  
Raw Material ◽  
Hardness Testing ◽  
Plastic Properties ◽  
Fine Microstructure ◽  
The Many

Abstract: The research was conducted because of the many industries that use CuZn 70/30 as a raw material in industrialization. CuZn 70/30 was studied to obtain the strong mechanical properties of brass. Research CuZn 70/30 was evaluated using a process of heating of about 6150 ± 50C and then held for 90 minutes. The next process is the process of cold rolling by using a variety of reduction and then tested by using a Vickers hardness testing, tensile testing, observation of the microstructure. The result of this research is a fine microstructure (below 10 μm), hardness (HV 211.67). Tensile test also conducted to get how much resistance CuZn 70/30 to resist the pull. The cold rolling process causing the decrease the mechanical properties and also increase the plastic properties of the brass. 

A simplified mathematical model for total temperature rise calculation in non-oriented silicon steel cold rolling deformation zone

2021 ◽  
Vol 119 (1) ◽  
pp. 104
Author(s):  
Guomin Han ◽  
Hongbo Li ◽  
Yujin Liu ◽  
Jie Zhang ◽  
Ning Kong ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Temperature Rise ◽  
Deformation Zone ◽  
Rolling Force ◽  
Silicon Steel ◽  
Initial Model ◽  
Contact Heat ◽  
Friction Heat ◽  
Total Temperature ◽  
Rolling Deformation

In tandem cold rolling, the control of the temperature of high-grade non-oriented silicon steel is a difficult problem for its large deformation resistance and the preheating procedure before rolling. And it is complicated to calculate the total temperature rise of rolling deformation zone due to the comprehensive influence of the plastic deformation heat, the friction heat and the contact heat loss. So, to precisely calculate the total temperature rise, firstly, based on the four classical cold rolling force formulas, the initial total temperature rise calculation models are established correspondingly by theoretically analyzing the temperature rise of deformation heat, the temperature rise of friction heat and the temperature drop of contact heat loss; then, the model based on the improved Lian rolling force formula is adopted, which leads to calculated best matching the measured temperature; finally, considering the complex formula calculation of the initial model, based on the influences of different rolling parameters on the total temperature rise, a simplified model for convenient calculation is proposed by the nonlinear regression analysis of the initial model calculation results and main rolling parameters, which is convenient for the actual application by the field technicians.

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