Experimental observation of 12 α variants inherited from one β grain in a Zr alloy

Chai, Linjiang; Luan, Baifeng; Zhang, Min; Murty, K. Linga; Liu, Qing

doi:10.1016/j.jnucmat.2013.05.053

Cited by 43 publications

(4 citation statements)

References 17 publications

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“…By contrast, three evident misorientation angle peaks can be observed around 3–5, 60, and 90° for the as-received Zr–2.5Nb (Figure 2d). It is further revealed in Figure 2f that rotation axes corresponding to the two peaks around 60 and 90° are relatively concentrated, consistent with typical Burgers misorientation characteristics [29].…”

Section: Resultssupporting

confidence: 68%

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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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Section: Resultssupporting

confidence: 68%

“…Further analyses in Figure 5e,f show that their misorientation angle peaks exclusively correspond to three rotation axes, which are coincident with those of three Burgers misorientations near 60°. This suggests that the Burgers OR is well obeyed in both the Zr alloys during the β water cooling [7,29].…”

Section: Resultsmentioning

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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“…A recent paper showed that in the extreme case of fast cooling rates and large grain size, nucleation of all 12 variants can occur in the same grain [42]. In the region of the HAZ close to the welding pool, corresponding to fast cooling rates and large grain size, up to 3 different variants are commonly observed in each grain.…”

Section: Texture Modellingmentioning

confidence: 99%

“…This reduces the number of non-equivalent orientations to 63. Moreover, some of the remaining 63 only differ in some degrees from one another [15,42]. The use of broad Gaussian distributions to simulate the initial texture in Figures 10 and 11 blurs the small orientation shifts originated by the different variants, resulting in a unique and broad structure.…”

Section: Texture Modellingmentioning

confidence: 99%

Crystallographic texture and microstructural changes in fusion welds of recrystallized Zry-4 rolled plates

Riffo

Alvarez

Santisteban

et al. 2017

Journal of Nuclear Materials

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This work presents a detailed characterization of the microstructural and crystallographic texture changes observed in the transition region in a weld between two Zircaloy-4 cold rolled and recrystallized plates. The microstructural study was performed by optical microscopy under polarized light and scanning electron microscopy (SEM). Texture changes were characterized at different lengthscales: in the micrometric size, orientation imaging maps (OIM) were constructed by electron backscatter diffraction (EBSD), in the millimetre scale, high energy XRD experiments were done at the Advanced Photon Source (USA) and compared to neutron diffraction texture determinations performed in the HIPPO instrument at Los Alamos National Laboratory. In the heat affected zone (HAZ) we observed the development of Widmanstätten microstructures, typical of the α(hcp) to β(bcc) phase transformation. Associated with these changes a rotation of the c-poles is found in the HAZ and fusion zone. While the base material shows the typical texture of a cold rolled plate, with their c-poles pointing 35º apart from the normal direction of the plate in the normal-transversal line, in the HAZ, c-poles align along the transversal direction of the plate and then reorient along different directions,

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Effect of Mo and Bi Additions on the Microstructure of Zr–Cr–Fe Alloy After β-Quenching

Wang

Luan

Murty

et al. 2017

The Minerals, Metals &Amp; Materials Series

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Experimental observation of 12 α variants inherited from one β grain in a Zr alloy

Cited by 43 publications

References 17 publications

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

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

Crystallographic texture and microstructural changes in fusion welds of recrystallized Zry-4 rolled plates

Effect of Mo and Bi Additions on the Microstructure of Zr–Cr–Fe Alloy After β-Quenching

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