Abstract
Bonding of Zr-4 alloy at high temperature risked the safe run of nuclear reactors. The diffusion bonding of Zr-4 alloy could be realized at low temperature by hydrogenation. In situ heating transmission electron microscopy was used to observe the microstructure and phase evolution of hydrogenated Zr-4 alloy during heating from room temperature to 650 °C to clarify the bonding mechanism of Zr-4 alloy. Zirconium hydrides gradually decomposed during the heating process and β-Zr phase formed in the matrix as a result. The observed decrease in the β phase transus temperature caused by hydrogen addition was about 210 °C. Results indicated that diffusion bonding of Zr-4 alloy can be achieved at lower temperature via hydrogenation because the β phase with body-centered cubic structure has better deformation ability.
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