Role of Structural Heredity in Control of Functional and Mechanical Characteristics of Ni-Rich Titanium Nickelide

Рыклина, Е. П.; Polyakova, K. A.; Murygin, Semen; Komarov, Victor; Resnina, Natalia; Андреев, В. А.

doi:10.1134/s0031918x22700053

Cited by 8 publications

(8 citation statements)

References 20 publications

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“…Ni-rich NiTi alloys are characterized by the elastic modulus having a magnitude somewhat higher than the upper limit of the above indicated range; in coarse-grained materials it amounts 33-73 GPa [15][16][17] and it is 52-77 GPa in extruded rods [18]. The NiTi SMAs exhibit an expressed V-shaped temperature dependence of Young's modulus with a minimum at the M s temperature (the onset temperature of martensitic transformation (MT) [15][16][17][18], which correlates with the similar V-shaped temperature behavior of the plateau stress (or transformation yield stress) [4,19,20].…”

Section: Introductionmentioning

confidence: 70%

“…The cited publications, however, do not provide an exhaustive knowledge of the structural responses of Young's modulus, since the comparative tests in the above cited studies are restricted by one or two kinds of structures (mainly recrystallized [15,17] or as-deformed [16,18]). Meanwhile, post-deformation annealing (PDA) is an obligatory procedure to provide a necessary temperature range for the shape recovery as well as other functional characteristics [3][4][5][6][7][8][9]19].…”

Section: Introductionmentioning

confidence: 99%

“…It was proven in [19] that the efficiency of aging in terms of the control of the functional and mechanical responses (tensile behavior) is determined by the specific features of the initial (unaged) substructure. The possibilities of aging with a variety of initial structures as factors affecting the elastic modulus of Ni-rich titanium nickelide remains obscure.…”

Section: Introductionmentioning

confidence: 99%

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On Structural Sensitivity of Young’s Modulus of Ni-Rich Ti-Ni Alloy

Рыклина

Murygin

Komarov

et al. 2023

Metals

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When developing bone implants, Young’s modulus is one of the primary characteristics of the material that should be considered. This study focuses on regulating the modulus of Ti-50.8 at.% Ni alloy by varying the grain/subgrain size as well as the initial structure using subsequent aging at 430 °C for 10 h. After post-deformation annealing (PDA), the temperature dependence of Young’s modulus exhibits a pronounced V-shaped character with a minimum at the onset temperature of the forward martensitic transformation, Ms, regardless of the structure. The grain/subgrain size of B2-austenite strongly affects the modulus magnitude. This effect is ambiguous for a material with a grain size range of 0.13–3 µm and depends on the test temperature. The effect of aging on the modulus reduction depends on the initial structure; it is most pronounced in an alloy with a relatively coarse grain size of 9 µm and brings a decrease of 3.8 times at a temperature of 37 °C. Aging of the initially recrystallized Ni-rich NiTi alloy makes it possible to obtain a вone-like elastic modulus of E = 12–13 GPa at an operating temperature of 37 °C. An ultrafine-grained substructure exhibits the same Young’s modulus values in the low temperature range from −100 to 25 °C.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On Structural Sensitivity of Young’s Modulus of Ni-Rich Ti-Ni Alloy

Рыклина

Murygin

Komarov

et al. 2023

Metals

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“…Before deformation, the average size of austenite grains recrystallized as a result of the RT was about 30 µm [25,26]. Pre-aging for 1 and 5 h was accompanied by a different intensity of the precipitation of the Ti 3 Ni 4 phase [14,22]. An analysis of Figure 2, which shows bright-field and dark-field images and SAED patterns, allows for the conclusion that the structure is abruptly refined as a result of QC ECAP deformation.…”

Section: Transmission Electron Microscopymentioning

confidence: 95%

“…The precipitation behaviors of the Ti 3 Ni 4 phase are largely dependent on chemical composition, aging temperatures/times, and the applied stress state during the aging treatment [10][11][12]. Additionally, the particular structural state of an alloy before aging strongly affects Ti 3 Ni 4 particle size and morphology, as well as the temperature ranges of martensitic transformation and the obtained properties [13,14]. The application of the aging process before mechanical treatment significantly affects the deformation behavior and structure formation of TiNi SMA.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States

Karelin,

Komarov,

Cherkasov

et al. 2023

Metals

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The effect of quasi-continuous (QC) equal-channel angular pressing (ECAP) in various pre-aged states on the structure formation and mechanical and functional properties of a hyper-equiatomic titanium nickelide (TiNi) shape memory alloy is studied. QC ECAP with a channel intersection angle of 110° is carried out at a temperature of 450 °C after aging for 1 and 5 h for three passes. To investigate the obtained structure and properties, the following research methods are applied: transmission electron microscopy, XRD analysis, calorimetric study, tension and hardness tests, and a special technique for the determination of functional properties. QC ECAP allows for the considerable refinement of structural elements and results in obtaining a mixed fine-grade structure, with structural elements of average sizes of 92 nm after pre-aging for 1 h and 115 nm after pre-aging for 5 h. Pre-aging for 5 h before QC ECAP, in combination with QC ECAP and post-deformation aging at 430 °C for 1 h, provides the best combination of mechanical and functional properties: a dislocation yield stress of 1410 MPa, ultimate tensile strength of 1562 MPa, and total recoverable strain of 11.6%. These values are comparable with the best results obtained for titanium nickelide and expand opportunities for the application of smart shape memory devices.

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