Deformation characteristics of the intermetallic alloy 60NiTi

Benafan, Othmane; Garg, A.; Noebe, Ronald D.; Skorpenske, Harley D.; An, Ke; Schell, Norbert

doi:10.1016/j.intermet.2016.11.003

Cited by 67 publications

(23 citation statements)

References 28 publications

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“…The obtained results correspond to the literature, [18][19][20] where the authors determined that the brittleness of the as-cast NiTi alloy is mainly influenced by the high cooling rate of the alloy and its higher nickel content. If the as-cast NiTi alloy is furnace cooled or later hot worked, it also shows ductile properties.…”

Section: Tensile Testsupporting

confidence: 88%

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Determination of mechanical and functional properties by continuous vertical cast NiTi rod

Stambolić¹,

Jenko²,

Kocijan³

et al. 2018

Mater. Tehnol.

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This article presents the information of the microstructure and methods for determination of mechanical and functional properties of the Continuous Vertical Cast (CVC) NiTi rod. We prepared special samples (discs, cylinders). The results of the microhardness measurements with HV0.1 show the average Vickers hardness value 583 HV0.1 in the cross-section of the CVC NiTi rod measured from the edge toward the middle of CVC NiTi rod. The results show that Vickers hardness slightly increases towards the center of the rod as a consequence of the formatted microstructure. The results of the tensile test show a typical curve for brittle materials. The obtained results indicate that the CVC NiTi rod does not pass into a non-linear plastic region. Therefore, CVC NiTi rod is unsuitable for strain hardening. The results of the compressive test also follow the conclusions that CVC NiTi rod is brittle material. Fracture of the CVC NiTi rod sample occurs before the material enters the plastic deformation region. The cytocompatibility of the CVC NiTi rod was tested with the submersion of the samples to the HUVEC cell solution, where HUVEC cells adhered to the samples surface. A commercial NiTi alloy was used to monitor the cytocompatibility. The results show that the number of adhered HUVEC cells on the samples surface of CVC NiTi rod is smaller than on commercial NiTi. The number of dead HUVEC cells on the samples surface of CVC NiTi rod is slightly larger than on commercial NiTi. The proportion of viable HUVEC cells on the samples surface of CVC NiTi rod is 96,6 %, while on commercial NiTi 98,4 %.

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Section: Tensile Testsupporting

confidence: 88%

“…Also higher Ni content means higher hardness. 19 From this it can be concluded that over 550 HV hardness of CVC NiTi rod is comprehensible due to its high Ni content (x Ni = 60 %) and fast water cooling during drawing.…”

Section: Hardnessmentioning

confidence: 83%

Determination of mechanical and functional properties by continuous vertical cast NiTi rod

Stambolić¹,

Jenko²,

Kocijan³

et al. 2018

Mater. Tehnol.

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“…Ni4Ti3 precipitates were not observed in this sample. [42], and can also become the sources for fatigue failure, wear failure, and localized corrosion [43].…”

Section: Solution Annealing and Aging At 550 ºC For 4 Hmentioning

confidence: 99%

Development of Nickel-Rich Nickel–Titanium–Hafnium Alloys for Tribological Applications

Mills

Noebe

DellaCorte

et al. 2020

Shap. Mem. Superelasticity

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The effects of various heat treatments on the microstructure and hardness of new Ni56Ti41Hf3 and Ni56Ti36Hf8 (atomic %) alloys were studied to evaluate the suitability of these materials for tribological applications. A solid-solution strengthening effect due to Hf atoms was observed for the solution annealed (SA) Ni56Ti36Hf8 alloy (716 HV), resulting in a comparable hardness to the Ni56Ti41Hf3 alloy containing 54 vol.% of Ni4Ti3 precipitates (707 HV). In the Ni56Ti41Hf3 alloy, the maximum hardness (752 HV), achieved after aging at 300°C for 12 h, was attributed to dense, semi-coherent precipitation of the Ni4Ti3 phase. Unlike the lenticular morphology usually observed within binary NiTi alloys, a "blocky" Ni4Ti3 morphology formed within Ni56Ti36Hf3 due to a smaller lattice mismatch in the direction normal to the habit plane at the precipitate/matrix interface. The maximum hardness for Ni56Ti36Hf8 (769 HV) was obtained after applying an intermediate aging step (300°C for 12 h) followed by normal aging (550 °C for 4 h). This two-step aging treatment induces dense nanoscale precipitation of two interspersed

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“…Highly Ni-rich NiTi alloys (>52 at%) have an advantageous set of properties needed for structural application [17]. Among the highly Ni-rich NiTi alloys, one that has recently received wide interest is 60NiTi (60 wt% Ni) bulk alloy [17−28].…”

Section: Introductionmentioning

confidence: 99%

Enhanced micro/nano-tribological performance in partially crystallized 60NiTi film

Zeng

2020

Friction

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The microstructure, mechanical and micro/nano-tribological properties of the 60NiTi film annealed at different temperature were investigated. The results reveal that annealing as-deposited 60NiTi film at 300, 375, and 600 °C for 1 h leads to structural relaxation, partial crystallization and full crystallization, respectively. Compared with the structurally relaxed structure, the partially crystallized structure exhibits increased hardness but decreased elastic modulus. This is because that the elastic modulus is reduced by Voigt model while the hardness is improved by composite effect. Due to the highest hardness and ratio of hardness to elastic modulus (H/E), the partially crystallized 60NiTi film has the lowest penetration depth and residual depth (i.e., groove depth). Besides, the results also reveal that ductile plowing is the dominant wear mechanism for all the annealed 60NiTi films. Under the condition of the ductile plowing, coefficient of friction and wear resistance are related to penetration depth and residual depth, respectively. Therefore, the partially crystallized 60NiTi film shows the best tribological performance at the micro/nano-scale. The current work not only highlights the important roles of hardness and H/E in improving the micro/nano-tribological properties but also concludes an efficient and simple method for simultaneously increasing hardness and H/E.

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Deformation characteristics of the intermetallic alloy 60NiTi

Cited by 67 publications

References 28 publications

Determination of mechanical and functional properties by continuous vertical cast NiTi rod

Determination of mechanical and functional properties by continuous vertical cast NiTi rod

Development of Nickel-Rich Nickel–Titanium–Hafnium Alloys for Tribological Applications

Enhanced micro/nano-tribological performance in partially crystallized 60NiTi film

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