| METALS AND METAL MATRIX COMPOSITES |
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| In-situ Investigation of β/α Phase Transition of Zirconium Alloy at Different Cooling Rates |
| BAO Chunling*, JIN Dehua, ZHANG Youwei, SHANG Erfeng, CHEN Yao, NING Zhaosheng, WANG Hong, WANG Wenqing
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| China Academy of Machinery Shenyang Research Institute of Foundry Co., Ltd., Shenyang 110022, China |
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Abstract In this work, high-temperature laser scanning confocal microscopy (HT-LSCM) was used for the first time to observe the β→α phase transformation process of R60702 and R60705 industrial-grade zirconium alloys. The synergistic mechanism of cooling rate and oxygen content on phase transition behavior was systematically revealed. It is found that the α phase of R60702 alloy preferentially nucleates along the β grain boundary and grows in stages, and finally forms a lamellar structure. However, the R60705 alloy induces grain boundary migration due to the presence of Nb elements, resulting in the simultaneous nucleation of α phases and grain boundaries in the grain, forming a staggered network structure. By adjusting the cooling rate (1—5 ℃/s), it was found that the high cooling rate (5 ℃/s) significantly increases the nucleation density of the α phase (2.3 times higher than that of 1 ℃/s), and promotes the multidirectional growth of the slat-like α phase, and the grain size is refined to (1.2±0.3) μm.Furthermore, combined with the Zr-O phase diagram and surface oxidation experiments, it was confirmed that the phase transition point temperature increases correspondingly with the increase of oxygen content, revealing the significant interference of surface oxidation on the in-situ observation results. This work provides a high-temporal and spatial resolution experimental basis for the phase transformation kinetics of zirconium alloys, and proposes a standardized sample preparation process for HT-LSCM technology, which lays a foundation for the engineering application of high-temperature in-situ characterization technology.
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Published: 25 June 2026
Online: 2026-07-08
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2026, Vol. 40 
