ABSTRACT

It is well known that cracks are observed on the surface without load when pure nickel is left in ambient air after hydrogen charge. It has been due to the decomposition of nickel hydride generated during hydrogen charging. In the present work, microcracks were investigated at the surface and inside the specimen with suppressing the decomposition of nickel hydride in polycrystalline pure nickel. As a result, microcracks initiate in the nickel matrix near the hydride inside the specimen before hydride decomposition. The microcracks grow toward the specimen’s surface as hydride decomposition.

中文翻译：

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氢诱导镍中裂纹的微裂纹引发机理

摘要

众所周知，当在充氢后将纯镍留在环境空气中时，在没有负载的情况下在表面上观察到裂纹。这是由于在充氢过程中产生的氢化镍的分解。在目前的工作中，研究了在试样表面和内部的微裂纹，以抑制氢化镍在多晶纯镍中的分解。结果，在氢化物分解之前，试样内部的氢化物附近的镍基体中会产生微裂纹。随着氢化物的分解，微裂纹向标本的表面生长。