Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys

Fan, Qunchao; Zhang, Y.H.; Wang, Y.Y.; Sun, Mingyan; Meng, Yi; Huang, Shuke; Yan, Wen

doi:10.1016/j.msea.2017.05.107

Cited by 66 publications

(27 citation statements)

References 37 publications

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“…The morphology of a monolithic Ni4Ti3 precipitate surrounded by B2 matrix is outlined with a dashed line, and the corresponding fast Fourier transform (FFT) pattern is shown in the bottom left inset. The precipitates have "equiaxed" morphology, which is different from the reported lenticular morphology for Ni4Ti3 precipitates in binary NiTi [14,15,27]. The average size of these Ni4Ti3 precipitates is 51  18 nm (length and width) and their average interparticle distance is 26…”

Section: Solution Annealingmentioning

confidence: 56%

“…High hardness in nickel-rich binary NiTi alloys is mainly attributed to nanoscale Ni4Ti3 precipitates [12][13][14][15][16] and to a lesser degree anti-site defects or Ni clustering due to excess Ni atoms within the matrix [17][18][19]. Moreover, coherency strain fields surrounding the Ni4Ti3 precipitates within the matrix can further enhance the hardness [13,20].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Solution Annealingmentioning

confidence: 56%

Section: Introductionmentioning

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 EDX analysis results in Table 1 suggest both a eutectic structure and a relatively inhomogeneous and Ti-rich microsegregation, similar to that for as-cast and solution-treated Ni-rich NiTi alloys. 30,31 Qin et al 31 showed that for solution-treated and Table 1. EDX data of the base materials as well as of the first, fifth, and tenth layer of the as-built NiTi-EBF3 specimens.…”

Section: Resultsmentioning

confidence: 99%

The electron beam freeform fabrication of NiTi shape memory alloys. Part I: Microstructure and physical–chemical behavior

Guimarães

Pixner

Trimmel

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Nickel–titanium alloys are the most widely used shape memory alloys due to their outstanding shape memory effect and superelasticity. Additive manufacturing has recently emerged in the fabrication of shape memory alloy but despite substantial advances in powder-based techniques, less attention has been focused on wire-based additive manufacturing. This work reports on the preliminary results for the process-related microstructural and phase transformation changes of Ni-rich nickel–titanium alloy additively manufactured by wire-based electron beam freeform fabrication. To study the feasibility of the process, a simple 10-layer stack structure was successfully built and characterized, exhibiting columnar grains and achieving one-step reversible martensitic–austenitic transformation, thus showing the potential of this additive manufacturing technique for processing shape memory alloys.

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“…В монокристаллах TiNi обеспечить высокий уровень прочностных свойств можно, во-первых, за счет выбора высокопрочной [001]-ориентации, в которой фактор Шмида равен нулю (m = 0) для действующих систем скольжения a 100 {011} в B2-фазе [3]. Во-вторых, для упрочнения богатых никелем двойных сплавов TiNi обычно используют старение при 673−823 K [3][4][5] Изменение температуры M s при МП в состоянии с наноразмерными частицами по сравнению с таковой для однофазного состояния может быть записано как [8,9]: упругой энергии, поскольку сами не испытывают МП и деформируются только упруго при развитии превращения, что приводит к возникновению внутренних упругих полей напряжений σ i . Влияние этого фактора учтено во втором слагаемом (1).…”

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“…B2-фазы в моноклинный B19 ′ -мартенсит[4,5]. Электронно-микроскопические исследования позволили обнаружить в состаренных монокристаллах наноразмерные (d < 10 nm) частицы Ti 3 Ni 4 , характерные рефлексы типа 1/7 321 B2[3,5] от которых присутствуют на микродифракционных картинах (рис.…”

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Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni

Timofeeva¹,

Суриков²,

Tagiltsev³

et al. 2019

Письма В Журнал Технической Физики

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As a result of low-temperature aging at 573 K for 1.5 h of Ti–50.6 at% Ni [001]-oriented single crystals quenched from 1253 K, a high-strength state is obtained due to the precipitation of Ti_3Ni_4 nanoscale particles ( d < 10 nm). The aging leads to the development of the B 2– B 19' martensitic transformation through an intermediate R phase, a reduction in the B 19' martensite formation temperatures by 40–60 K, an increase in the strength properties of the B 2 phase from 730 to 2100 MPa, and an extension of the superelasticity interval Δ T _SE in compression from Δ T _SE = 60 to 170 K (compared to quenched crystals).

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Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys

Cited by 66 publications

References 37 publications

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

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

The electron beam freeform fabrication of NiTi shape memory alloys. Part I: Microstructure and physical–chemical behavior

Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni

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Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys

Cited by 66 publications

References 37 publications

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

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

The electron beam freeform fabrication of NiTi shape memory alloys. Part I: Microstructure and physical–chemical behavior

Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.&#37; Ni

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Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni