Atomic scale investigation of FCC → HCP reverse phase transformation in face-centered cubic zirconium. (20th February 2023)

• Record Type: Journal Article
• Authors: Guo, Wenbin; Han, Fuzhou; Li, Geping; Zhang, Yingdong; Ali, Muhammad; Ren, Jie; Wang, Qichen; Yuan, Fusen
• Is Part Of: Journal of materials science & technology. Volume 137(2023)
• Page Start: 8
• Page End: 13
• Publication Date: 2023-02-20
• Subjects: Zircaloy-4 -- Reverse phase transformation -- Fcc-Zr phase -- Interaction; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2022.07.032
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: FCC → HCP reverse phase transformation in an FCC-Zr grain along with a concomitant rotation of 70.5° with α-Zr matrix is observed. The possible interaction among three FCC-Zr grains and a nearby secondary phase particle is discussed. The nature and driving force behind the FCC → HCP reverse phase transformation are revealed. Abstract: Mechanism of FCC → HCP reverse phase transformation in face-centered cubic zirconium (FCC-Zr) along with a concomitant 70.5° rotation of α-Zr matrix were investigated in zircaloy-4 (Zr-4) cladding tube by using transmission electron microscopy (TEM). Results showed that the interaction among a secondary phase particle (SPP) and three FCC-Zr grains resulted in the formation of cross stacking faults in SPP and exerted a drag force on minor axis of the adjacent FCC-Zr phase. Moreover, when the shear stress along [ 1 ¯ 1 ¯ 2 ¯ ] FCC-Zr direction was large enough to initiate the emission of 1 6 [ 1 ¯ 1 ¯ 2 ¯ ] Shockley partial dislocation on every other ( 11 1 ¯ )FCC-Zr close-packed plane, the stacking sequence would change from ABC ABCA to AB ABABA viz. (0001) planes of the daughter HCP phase. Thus, FCC → HCP reverse phase transformation in FCC-Zr was presented.