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 hydrides induced by stress were found to be gammaphase with orientation relationship of (110)_γ//(1120)_(αZr),(001)γ//(0001)_(αZr)between γ-hydride and surrounding matrix. The growth of-hydrides exhibiter a quickest ratealong [110] direction, that brings them in taper shape. After cracking at hydridematrix beundary, a new one will precipitate at the tip of cracks. This isthe essential process of hydrogen-induced delayed cracking in zircaloy The pre-cipitating hydrides induced by strain were found to be delta phase Phase with bothorientation relationships of (111)_δ//(0001)_(αZr)(110)_δ//(1120)_(αZr) and (010)_δ//(0001)_(αZr)(001)_δ//(1120)_(αZr) between δ-hydride and surrouding matrix. The δ-hydride becomesmuch finer as the strain rate increased.
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| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
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