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用电子显微镜原位研究了Zr-2合金中的氢化锆在应力及应变作用下的析出过程。应力诱发析出的氢化锆为γ相,与基体间存在(110)_γ//(1120)_(αZr),(001)_γ//(0001)_(αZr)的取向关系。γ氢化锆沿它的[110]生长最快,形成尖劈状。当沿氢化锆开裂后,在裂纹端部又将析出氢化锆。应变诱发析出的氢化锆为δ相,与基体间存在(111)_δ//(0001)_(αZr),(110)_δ//(1120)_(αZr);或(010)_δ//(0001)_(αZr),(001)_δ//(1120)_(αZr)的取向关系。形变速率越高,δ氢化锆越细小。
The precipitation process of zirconium hydride in Zr-2 alloy under stress and strain was investigated by electron microscope in situ. The stress-induced precipitation of zirconium hydride is the γ-phase and has the orientation relationship of (110) _γ // (1120) _ (αZr), (001) _γ // (0001) _ (αZr) with the matrix. Gamma zirconium hydride grows fastest along its [110], forming a wedge-like shape. When cracking along the zirconium hydride, zirconium hydride precipitates again at the crack tip. The strain-induced precipitation of zirconium hydride is δ phase with (111) _δ // (0001) _ (αZr), (110) _δ // (1120) _ (αZr) or (010) _δ // 0001) _ (αZr), (001) _δ // (1120) _ (αZr). The higher the rate of deformation, the finer the δ-zirconium hydride.