Development of NiTiNb in-situ composite with high damping capacity and high yield strength

Bao, Zhen‐Zhen; Guo, Shun; Fang, Xiao; Zhao, Xinqing

doi:10.1016/s1002-0071(12)60060-4

Cited by 37 publications

(21 citation statements)

References 12 publications

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“…Hence, an external bias load is required to facilitate the one-way shape memory response and a measurable strain-temperature (e-T) response. The composite microstructure will increase the interfaces between NiTi(Nb) and b-Nb phases [20] and which could act to increase the dislocation density associated with the strength mismatch between b-Nb fibers and matrix [35]. During straining throughout the forward martensitic transformation (MT), the Nb-rich fibers can have a strong coupling with the NiTi(Nb) matrix [37,38].…”

Section: Discussionmentioning

confidence: 99%

“…More recently, the NiTiNb classes of SMAs have garnered interests due to the wide hysteresis levels matching operating temperatures for civil engineering applications requiring pre-stressing or constraint stressing [14][15][16][17][18][19]. Furthermore, the materials are expected to exhibit damping potential [20,21] as well as good oxidation resistance [22].…”

Section: Introductionmentioning

confidence: 99%

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Shape Memory Effect in Cast Versus Deformation-Processed NiTiNb Alloys

Hamilton

Lanba

Ozbulut

et al. 2015

Shap. Mem. Superelasticity

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The shape memory effect (SME) response of a deformation-processed NiTiNb shape memory alloy is benchmarked against the response of a cast alloy. The insoluble Nb element ternary addition is known to widen the hysteresis with respect to the binary NiTi alloy. Cast microstructures naturally consist of a cellular arrangement of characteristic eutectic microconstituents surrounding primary matrix regions. Deformation processing typically aligns the microconstituents such that the microstructure resembles discontinuous fiber-reinforced composites. Processed alloys are typically characterized for heat-to-recover applications and thus deformed at constant temperature and subsequently heated for SME recovery, and the critical stress levels are expected to facilitate plastic deformation of the microconstituents. The current work employs thermal cycling under constant bias stresses below those critical levels. This comparative study of cast versus deformation-processed NiTiNb alloys contrasts the straintemperature responses in terms of forward DT F = M s-M f and reverse DT R = A f-A s temperature intervals, the thermal hysteresis, and the recovery ratio. The results underscore that the deformation-processed microstructure inherently promotes irreversibility and differential forward and reverse transformation pathways.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shape Memory Effect in Cast Versus Deformation-Processed NiTiNb Alloys

Hamilton

Lanba

Ozbulut

et al. 2015

Shap. Mem. Superelasticity

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“…It is known that Nb plays an important role in nitinol-based alloys because the addition of Nb increases the hysteresis of martensitic transformation [7]. Besides, the addition of Nb improves the biocompatibility of NiTi-based alloys [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

Polozov

Popovich

2021

Materials

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This paper presents the results of selective laser melting (SLM) process of a nitinol-based NiTiNb shape memory alloy. The eutectic alloy Ni45Ti45Nb10 with a shape memory effect was obtained by SLM in-situ alloying using a powder mixture of NiTi and Nb powder particles. Samples with a high relative density (>99%) were obtained using optimized process parameters. Microstructure, phase composition, tensile properties, as well as martensitic phase transformations temperatures of the produced alloy were investigated in as-fabricated and heat-treated conditions. The NiTiNb alloy fabricated using the SLM in-situ alloying featured the microstructure consisting of the NiTi matrix, fine NiTi+β-Nb eutectics, as well as residual unmelted Nb particles. The mechanical tests showed that the obtained alloy has a yield strength up to 436 MPa and the tensile strength up to 706 MPa. At the same time, in-situ alloying with Nb allowed increasing the hysteresis of martensitic transformation as compared to the alloy without Nb addition from 22 to 50 °C with an increase in Af temperature from −5 to 22 °C.

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“…This study focuses on fully annealed NiTiNb SMA. The ternary addition of Niobium (Nb) to Ni-Ti matrix significantly enhances the mechanical properties of the alloy by widening the thermal hysteresis [7], and increasing the damping capacity and yield strength of the alloy [8]. NiTiNb SMA in annealed state has been used by many researchers for active confinement and heat-activated prestressing of structural elements [9,10].…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviour of NiTiNb shape memory alloy wires– strain localisation and effect of strain rate

Suhail

Chen

Amato

et al. 2020

Mechanics of Materials

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Over the past few years, shape memory alloys (SMAs) have received increased attention in civil engineering research due to their unique features such as superelasticity, shape memory effect (SME), high ductility and good corrosion resistance. SMAs, however, have complex material behaviour which depends on many parameters such as chemical composition, thermo-mechanical treatment and ambient temperature. SMAs exhibit high strain-rate sensitivity and strong strain localisation during the stress-induced martensitic (SIM) phase transformation. Both have serious implication in civil engineering applications. Strain rate effects and the strain localisation in SMAs have been commonly investigated separately in the literature which has been mostly focused on NiTi SMA. This paper investigates the strain localisation phenomenon, the effect of strain rate and their interaction in NiTiNb SMA. The digital image correlation (DIC) technique was used to investigate the strain localisation phenomenon. The effect of strain rates is investigated within the quasi-static range and varies from 3.3×10 −5 /s to 3.3×10 −2 /s in strain-controlled tests and 2×10 −5 /s to 2×10 −1 /s in displacement-controlled tests. Significant non-uniform strain distribution is observed during the SIM phase transformation, which progresses through the nucleation and broadening of the transformation bands (TBs). The nucleation of the TBs and the unloading strain recovery within the TBs show high strain-rate sensitivity. At high strain rates, the nucleation of a TB is accompanied by a significant stress-drop.

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Development of NiTiNb in-situ composite with high damping capacity and high yield strength

Cited by 37 publications

References 12 publications

Shape Memory Effect in Cast Versus Deformation-Processed NiTiNb Alloys

Shape Memory Effect in Cast Versus Deformation-Processed NiTiNb Alloys

Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

Mechanical behaviour of NiTiNb shape memory alloy wires– strain localisation and effect of strain rate

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