Strengthening or weakening texture intensity of Zr alloy by modifying cooling rates from α + β region

Chai, Linjiang; Xia, Jiying; Yan, Zhi; Chen, Ke; Wang, Tingting; Song, Bo; Guo, Ning

doi:10.1016/j.matchemphys.2018.04.044

Cited by 21 publications

(5 citation statements)

References 33 publications

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“…The reduction in textural intensity causes the material to display more uniform properties in different directions, regardless of specific grain orientations. This reduction in textural intensity enhances the mechanical performance of the material [38]. Based on these findings, it can be inferred that the tensile cycles contribute to grain refinement and to the reduction in textural intensity in the Ti-15Mo alloy.…”

Section: In Situ Ebsd Tensile Cyclic Deformation With a 2% Strain Amp...mentioning

confidence: 75%

“…Grains with higher SF values tend to activate {332}<113> twinning as their primary deformation mode, rendering them more susceptible to this twinning behavior. The proliferation of twins during deformation is believed to account for the alloy's elevated and stable strain-hardening rate [38]. The non-uniformity of the deformation mechanism implies that, under a given macroscopic strain, individual grains do not experience identical local strain conditions.…”

Section: In Situ Ebsd Tensile Cyclic Deformation With a 2% Strain Amp...mentioning

confidence: 99%

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The {332}<113> Twinning Behavior of a Ti-15Mo Medical Alloy during Cyclic Deformation and Its Effect on Microstructure and Performance

Xu,

Sun,

Zhang

et al. 2024

Materials

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In this study, the microstructural evolution of a Ti-15Mo medical alloy was investigated, when the in situ cyclic tensile strain had 2% amplitude and the tension–compression cyclic deformation had 1%, 2%, and 3% amplitude. The Vickers hardness and wear resistance of the alloy were also optimized due to the grain-refining effect after cyclic deformation and annealing. The twinning-induced plasticity (TWIP) was considered the main deformation mechanism of the Ti-15Mo alloy during the tensile–compressive cycle deformation with suitable strain amplitude. The {332}<113> twins and boundaries were the main contributors to the grain refinement. The optimal microstructure, hardness, and wear resistance were obtained in the alloy deformed by tension–compression cyclic strain with a 3% strain amplitude. The wear resistance of the annealed alloy in Hank’s solution was excellent in contrast to the original Ti-15Mo alloy due to its reasonable microstructure and hardness. It is clear that abundant twins were formed and retained in the coarse grains of the original alloy after cyclic deformation and annealing, which provided the expected refined grains and performance.

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Section: In Situ Ebsd Tensile Cyclic Deformation With a 2% Strain Amp...mentioning

confidence: 75%

Section: In Situ Ebsd Tensile Cyclic Deformation With a 2% Strain Amp...mentioning

confidence: 99%

The {332}<113> Twinning Behavior of a Ti-15Mo Medical Alloy during Cyclic Deformation and Its Effect on Microstructure and Performance

Xu,

Sun,

Zhang

et al. 2024

Materials

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“…It has been found that variant selection often occurs during the β→α transformation, leading to the appearance of only a few out of all the twelve α variants [9,20,39]. Nevertheless, a recent study by Chai et al [40] demonstrated that such variant selection behavior could be largely suppressed at high cooling rates (for example water cooling). In the present study, one can expect that the β water cooling should be able to produce many new α orientations in both the Zr alloys, resulting in their grain orientations markedly different from those in the as-received specimens.…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Microstructural Characteristics and Hardness of β-Quenched Zr702 and Zr–2.5Nb Alloys

et al. 2019

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In this study, two commercial Zr alloys (Zr702 and Zr–2.5Nb) were subjected to the same β-quenching treatment (water cooling after annealing at 1000 °C for 10 min). Their microstructural characteristics and hardness before and after the heat treatment were well characterized and compared by electron channel contrast (ECC) imaging, electron backscatter diffraction (EBSD) techniques, and microhardness measurements. Results show that after the β quenching, prior equiaxed grains in Zr702 are transformed into Widmanstätten plate structures (the average width ~0.8 μm) with many fine precipitates distributed along their boundaries, while the initial dual-phase (α + β) microstructure in Zr–2.5Nb is fully replaced by fine twinned martensitic plates (the average width ~0.31 μm). Differences in alloying elements (especially Nb) between Zr702 and Zr–2.5Nb are demonstrated to play a key role in determining their phase transformation behaviors during the β quenching. Analyses on crystallographic orientations show that the Burgers orientation relationship is well obeyed in both the alloys with misorientation angles between α plates essentially focused on ~60°. After β quenching, the hardnesses of both alloys were increased by ~35%–40%. Quantitative analyses using the Hall–Petch equation suggest that such an increase was mainly attributable to phase transformation-induced grain refinements. Since Nb is able to effectively refine the β-quenched structures, a higher hardness increment is produced in Zr–2.5Nb than in Zr702.

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“…Подобная структура -результат прохождения фазового превращения β → α при закалке по мартенситному типу с формированием мартенситных пластин α-Zr. Известно, что при высоких скоростях охлаждения (в воде) в сплаве Zr-2,5Nb образуется двойная структура, которая состоит из пластинчатых α-зерен, претерпевших фазовое превращение β → α и находящихся внутри исходных β-зерен [15]. После закалки происходит полное растворение частиц Nb с переходом атомов ниобия в твердый раствор (рис.…”

Section: материалы и методы исследованияunclassified

“…После закалки соотношение интенсивностей линий α-фазы Zr меняется. Известно, что быстрое охлаждение в воде приводит к ослаблению текстуры в Zr-сплаве [22]. РКУП закаленного состояния, по-видимому, обуславливает дальнейшее ослабление и размывание текстуры, и в состоянии «закалка + РКУП (n = 2)» и «закалка + + РКУП (n = 4)» пик (101) α-фазы становится наиболее интенсивным, как и должно быть в безтекстурном состоянии α-фазы Zr.…”

Section: результатыunclassified

Impact of ECAP at 300 °C on the microstructure and mechanical properties of the quenched Zr–2.5%Nb alloy

Gunderov,

Stotskiy,

Gunderova

et al. 2024

Izv.VUZ. Tsvet. Met.

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We investigated the microstructure of the Zr–2.5%Nb zirconium alloy after subjecting it to equal-channel angular pressing (ECAP) and found that ECAP at 300 °C increases the strength by 140 to 180 %. Notably, unlike other studies, our alloy did not show complete dissolution of niobium particles, which may be due to the reduced diffusion rates at the lower deformation temperature of 300 °C. Pre-treatment involving quenching before severe plastic deformation was also studied, which developed a lamellar structure introducing additional boundaries that facilitated grain refinement during subsequent ECAP. The strength of the alloy was further enhanced by solid-solution hardening, achieved through the complete dissolution of the Nb particles into the matrix post-quenching. This process resulted in a 2.3-fold increase in yield strength after quenching plus ECAP compared to the initial coarse-grained state.

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Strengthening or weakening texture intensity of Zr alloy by modifying cooling rates from α + β region

Cited by 21 publications

References 33 publications

The {332}<113> Twinning Behavior of a Ti-15Mo Medical Alloy during Cyclic Deformation and Its Effect on Microstructure and Performance

The {332}<113> Twinning Behavior of a Ti-15Mo Medical Alloy during Cyclic Deformation and Its Effect on Microstructure and Performance

Comparative Study of Microstructural Characteristics and Hardness of β-Quenched Zr702 and Zr–2.5Nb Alloys

Impact of ECAP at 300 °C on the microstructure and mechanical properties of the quenched Zr–2.5%Nb alloy

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