Toward tunable mechanical behavior and enhanced elastocaloric effect in NiTi alloy by gradient structure

2021 ◽  
pp. 117609
Author(s):  
Junyu Chen ◽  
Binqi Liu ◽  
Leilei Xing ◽  
Wei Liu ◽  
Liping Lei ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Niti Alloy ◽  
Gradient Structure ◽  
Elastocaloric Effect

Grain Size Distribution Effect on Mechanical Behavior of Nanocrystalline Materials

2004 ◽  
Vol 821 ◽  
Author(s):  
A.V. Sergueeva ◽  
N.A. Mara ◽  
A.K. Mukherjee
Keyword(s):  
Grain Size ◽  
Mechanical Behavior ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Nanocrystalline Materials ◽  
Tensile Deformation ◽  
Size Structure ◽  
Niti Alloy ◽  
Distribution Effect ◽  
The Matrix

AbstractGrain size distribution effect on the mechanical behavior of NiTi and Vitroperm alloys were investigated. Yielding at significantly lower stresses than found in equiaxed counterparts, along with well defined strain hardening was observed in these nanocrystalline materials with large grains embedded in the matrix during tensile deformation at temperatures of 0.4Tm. At higher temperature the effect of grain size distribution on yield stress was not revealed while plasticity was increased in 50% in NiTi alloy with bimodal grain size structure.

scholarly journals Elastocaloric effect and mechanical behavior for NiTi shape memory alloys

2018 ◽  
Vol 27 (10) ◽  
pp. 106501 ◽  
Author(s):  
Min Zhou ◽  
Yu-Shuang Li ◽  
Chen Zhang ◽  
Lai-Feng Li
Keyword(s):  
Shape Memory Alloys ◽  
Mechanical Behavior ◽  
Shape Memory ◽  
Elastocaloric Effect ◽  
Niti Shape Memory Alloys

Modeling of rate dependency of mechanical behavior of superelastic NiTi alloy under cyclic loading

2018 ◽  
Vol 100 (9-12) ◽  
pp. 2715-2724 ◽  
Author(s):  
Riheme Sarraj ◽  
Wissem Elkhal Letaief ◽  
Tarek Hassine ◽  
Fehmi Gamaoun
Keyword(s):  
Cyclic Loading ◽  
Mechanical Behavior ◽  
Niti Alloy ◽  
Rate Dependency

scholarly journals The influence of aging treatment on the microstructural and mechanical behavior by ultra-micro hardness tester in Ni-rich NiTi alloy

2021 ◽  
Vol 16 (47) ◽  
Author(s):  
Naiara Vieira Le Sénéchal ◽  
Rodolfo Teixeira ◽  
Patrícia Freitas Rodrigues ◽  
Shimeni Baptista Ribeiro ◽  
Andersan dos Santos Paula
Keyword(s):  
Heat Treatment ◽  
Mechanical Behavior ◽  
Solution Heat Treatment ◽  
Niti Alloy ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Micro Hardness ◽  
Thermomechanical Process ◽  
Rotary Forging ◽  
Cold Rotary Forging

The present study aims to assess the superelasticity behavior in Ni-rich NiTi alloy wire produced by rotary forging process. The thermomechanical process involved four steps of hot working at 800ºC, two steps of cold working with solution heat treatment at 800ºC between them, and subsequently a solution heat treatment (950ºC during 2 hours) followed by aging treatment at 350, 400 and 450 ºC during 30 minutes. X-ray diffraction (XRD) and instrumented ultra-micro hardness testers evaluated the present phase at each aged sample and were compared with their mechanical behavior. The results put in evidence the work-hardening effect on a forged condition associated with the final step of cold rotary forging. The solution treatment promotes stress relaxation and precipitate dissolution. The sample heat-treated shows the presence of the precipitated (Ni4Ti3) and R phase. The presence of these precipitates is beneficial because precipitation-hardening increases the yield strength of austenite, which in turn contributes to better functional stability.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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