氢化物在Zr—4合金中变形行为的研究

Deformation Behavor of Hydride in Zircaloy-4

摘要:

利用SEM原位观察，研究了氢化物在Zr-4合金中的形貌，大块团状分布的氢化物，稀疏分布的氢化物和单个氢化物的变形行为。结果表明Zr-4合金中的氢化物在室温下具有一定的塑性变形能力，可以随基体发生较大的变形，且氢化物的变形行为和其形貌密切相关。大块团状分布的氢化物的变形能力较差，断裂较早，稀疏分布的氢化物的变形能力较好，断裂较晚，而单个氢化物的变形能力最好，不易断裂。

Abstract:

The morphology and deformation behavior of the clustered, scattered and isolated hydrides in recrystallized Zr 4 have been studied by in situ SEM. It is shown that the hydride can deform plastically together with the matrix at room temperature. The deformation behavior of hydrides depends on their morphology. The clustered hydrides fracture at relatively low strain levels while the sparse hydrides are more ductile and usually fracture at a quite large strain. The isolated hydride has the best deformation capability and is difficult to fracture.