The Influence of Dimesions and Phase State of Structural Elements on Mechanical Properties of Binary Alloys of the Ti–Nb and Zr–Nb Systems

Eroshenko, A. Yu.; Sharkeev, Yu. P.; Глухов, И. А.; Уваркин, П. В.; Mairambekova, A. M.; Толмачeв, А. И.

doi:10.1007/s11182-019-01616-z

Cited by 11 publications

(10 citation statements)

References 8 publications

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“…The material used for this investigation was a bioinert Ti-45 wt.% Nb (Ti-45Nb) alloy in both coarse-grained (CG) and ultrafine-grained (UFG) states. According to the standard classification [ 42 ], the UFG state corresponds to a range of sizes of structural elements (grains, subgrains, and fragments) from 0.1 to 1 µm, and the CG state corresponds to a range of 10–100 µm. The chemical composition of the Ti-45Nb alloy is presented in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…The as-received rods were cut into billets (40 mm in length and 25 mm in diameter) for further molding and pressing, followed by plastic deformation. The UFG structure in the investigated alloy was formed by the two-stage SPD method, which included multidirectional forging (abc–forging) and multipass rolling in grooved rollers, with further recrystallization annealing [ 42 , 43 , 44 ]. The method of producing the Ti-45Nb alloy billets is presented in Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

“…The combination of abc-pressing with rolling provided the formation of a finer-dispersed UFG structure, compared with the structure formed after the abc-pressing. To reduce the internal stress and increase elasticity, the produced Ti-45Nb alloy rods were annealed at 350 °C [ 42 , 44 ] for 1 h in an argon atmosphere and cooled in the furnace. Annealing at 350 °C did not change the structure-state of the materials but it did increase the elastic limit.…”

Section: Methodsmentioning

confidence: 99%

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Characteristic Features of Ultrafine-Grained Ti-45 wt.% Nb Alloy under High Cycle Fatigue

et al. 2021

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The paper presents the results of fatigue-testing ultrafine-grained and coarse-grained Ti-45 wt.% Nb alloy samples under very high cycle fatigue (gigacycle regime), with the stress ratio R = −1. The ultrafine-grained (UFG) structure in the investigated alloy was formed by the two-stage SPD method, which included multidirectional forging (abc–forging) and multipass rolling in grooved rollers, with further recrystallization annealing. The UFG structure of the Ti-45 wt.% Nb alloy samples increased the fatigue limit under the high-cycle fatigue conditions up to 1.5 times compared with that of the coarse-grained (CG) samples. The infrared thermography method was applied to investigate the evolution of temperature fields in the samples under cyclic loading. Based on numerical morphology analysis, the scale invariance (the Hurst exponent) and qualitative differences for UFG and CG structures were determined. The latter resulted from the initiation and propagation of fatigue cracks in both ultra-fine grained and coarse-grained alloy samples under very high-cycle fatigue loading.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Characteristic Features of Ultrafine-Grained Ti-45 wt.% Nb Alloy under High Cycle Fatigue

et al. 2021

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“…4 представлены зависимости среднего размера структурных элементов (кривая 1) и микротвердости (кривая 3) от температуры отжига для сплава Ti-40 мас.% Nb. Дополнительно на графике показаны аналогичные зависимости (кривые 2, 4) и для УМЗ титан-ниобиевого сплава с содержанием ниобия 45 мас.% при отжигах в том же диапазоне температур согласно данным работы [14]. Средний размер структурных элементов сплава Ti-45 мас.% Nb в УМЗ состоянии составил 0.25 мкм, а объемная доля α-фазы -5 об.%.…”

Section: результаты и обсужденияunclassified

“…При этом важным вопросом является стабильность структурно-фазового состояния и механических свойств УМЗ титан-ниобиевых сплавов с содержанием ниобия в интервале 40 -45 мас.% в широком интервале температур [13]. Данные по влиянию отжигов на микроструктуру и механические свойства сплава Ti-45 мас.% Nb были приведены в работе [14]. Представляется важным и исследование влияния отжигов на структурнофазовые превращения в сплаве Ti-Nb с концентрацией ниобия, равной 40 мас.% Nb, при которой сплав имеет также более низкий модуль упругости.…”

Section: Introductionunclassified

Microstructure of ultrafine-grained Ti-40 wt.% Nb alloy after annealing

et al. 2020

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The results of studies on the evolution of the microstructure and phase composition of ultrafine-grained Ti-40 wt.% Nb alloy during annealing in the temperature range of 673 -1073 K are presented. The ultrafine-grained structure in the Ti-40 wt.% Nb alloy was formed by a combined severe plastic deformation (SPD) method, which includes three-cycled abc-forging with a sequential temperature decrement in the range of 773 -673 K, multi-pass rolling in grooved rollers at room temperature, and subsequent recrystallization annealing at 573 K. After SPD, the Ti-40 wt.% Nb alloy had a microstructure represented by the β-phase subgrains with ellipsoidal particles of the ω-phase localized in the bulk of the β-grains, and the α-phase subgrains. The average size of structural elements (grains, subgrains and fragments) was 0.28 μm. After annealing in the range of 673 -873 K, the microstructure consisted of the dispersion-strengthened ω-phase, β-subgrains and α-subgrains, similarly to the initial UFG state. At the same time, a redistribution of the volume fraction of the α-phase occurred. In the range of 773 -973 K, the transformation of the ultrafine-grained (β + α + ω)-structure into a fine-grained structure consisting of β-and ω-phases with phase transformation according to the α → β scheme was observed. At temperatures above 973 K, active recrystallization occurred, which was accompanied by the rapid growth of a dispersive-strengthened β-phase grain size. This was also accompanied by the transformation of the alloy into a сoarse-grained state and a significant decrease of microhardness. Change in the concentration of niobium in the range of 40 -45 wt.% for the titanium-niobium alloy in the ultrafine-grained state does not have a significant effect on the structural-phase transformations during annealing.

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The Influence of Ultrafine-Grained State of Zr – 1 wt.% Nb and Ti – 45 wt.% Nb Alloys on their Thermophysical Properties and Energy Dissipation and Accumulation during Deformation

et al. 2021

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The Influence of Dimesions and Phase State of Structural Elements on Mechanical Properties of Binary Alloys of the Ti–Nb and Zr–Nb Systems

Cited by 11 publications

References 8 publications

Characteristic Features of Ultrafine-Grained Ti-45 wt.% Nb Alloy under High Cycle Fatigue

Characteristic Features of Ultrafine-Grained Ti-45 wt.% Nb Alloy under High Cycle Fatigue

Microstructure of ultrafine-grained Ti-40 wt.% Nb alloy after annealing

The Influence of Ultrafine-Grained State of Zr – 1 wt.% Nb and Ti – 45 wt.% Nb Alloys on their Thermophysical Properties and Energy Dissipation and Accumulation during Deformation

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