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用透射电子显微镜拉伸试样台原位研究了应力、电子束辐照以及第二相对Zr-4合金中氢化物析出和长大的影响。结果表明,在拉应力作用下,裂纹易于沿氢化物扩展,并在裂尖垂直于拉应力方向析出新的氢化物。氢化物在拉应力诱发下的析出、开裂、再析出·····过程,导致了氢致延迟开裂。在较强的会聚电子束辐照下,Zr-4合金中的氢化物会分解,新的氢化物会围绕着附近的Zr(Fe,Cr)2第二相粒子析出,新析出的氢化物为面心立方结构的δ相。
The effects of stress, electron beam irradiation and precipitation and growth of hydride in the second relative Zr-4 alloy were studied in situ by transmission electron microscopy (TES). The results show that under the tensile stress, the crack is easy to expand along the hydride, and new hydride is precipitated at the crack tip perpendicular to the tensile stress. Hydrides induced by tensile stress precipitation, cracking, re-precipitation process, leading to hydrogen induced delayed cracking. In the strong convergent electron beam irradiation, the hydrides in the Zr-4 alloy will decompose and the new hydrides will precipitate around the second phase particles of Zr (Fe, Cr) 2. The newly precipitated hydride is Face-centered cubic structure of δ phase.