Effects of heating rates and alloying elements (Sn, Cu and Cr) on the α → α + β phase transformation of Zr–Sn–Nb–Fe–(Cu, Cr) alloys

Qiu, Risheng; Luan, Baifeng; Chai, Linjiang; Zhang, X.Y.; Liu, Q.

doi:10.1016/j.jnucmat.2014.07.017

Cited by 15 publications

(1 citation statement)

References 31 publications

(33 reference statements)

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“…In recent years, solid-state phase transformations in Zr materials have garnered increasing attention [ 5 , 6 , 7 ]. According to reports, Zr commonly appears in three different types of structures: a hexagonal close-packed structure (HCP, α-Zr), body-centered cubic structure (BCC, β-Zr), and simple hexagonal structure (ω-Zr) [ 3 , 8 , 9 ]. However, during the processes of thermal treatment [ 10 ] and plastic deformation [ 11 , 12 ], a unique phase with a face-centered cubic structure (FCC-Zr) has been observed in Zr and its alloys.…”

Section: Introductionmentioning

confidence: 99%

Fatigue-Induced HCP-to-FCC Phase Transformation Resulting in Two FCC-Zr Variants in Pure Zirconium

Jiang,

Chen,

Shuai

et al. 2023

Materials

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This study utilized transmission electron microscopy (TEM) and on-axis transmission Kikuchi diffraction (TKD) to investigate the fatigue-induced HCP-to-FCC phase transformation in industrial pure zirconium under a stress ratio of R = 0.1. The results show that fatigue damages result from phase deformations during cyclic loadings. The fatigue-induced FCC-Zr phases exhibit a B-type orientation relationship with the HCP-Zr matrix. Notedly, due to the different growth directions of Shockley partial dislocations relative to nucleation points, there are two FCC-Zr variants after the HCP-to-FCC phase transformation. The content of these two variants accounts for 65% and 35% of the total FCC-Zr, respectively, appearing as lamellae morphology embedded parallelly within the matrix. The distribution of the two variants includes isolated distribution and adjacent distribution. For the adjacent distribution, a twinning relationship is observed between the two variants. Meanwhile, as an intermediate transition stage of the HCP-to-FCC phase transformation, stacking faults are observed at the boundaries of the FCC-Zr lamellae. These findings offer insights into the microstructural features and formation mechanisms of fatigue-induced HCP-to-FCC phase transformation.

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