氢对纯镍弹性模量的影响

用静电激发调频检测法对比测量了纯镍试样电解充氢和人为部分应力松弛后在室温时效过程中杨氏模量随时间的变化。结果表明:在人为部分应力松弛后的时效过程中,杨氏模量逐渐升高,其稳态值比初始值升高0.87％;而在充氢后的时效过程中,氢不断地从试样中逸出,同时杨氏模量也不断地降低,其稳态值比充氢后的瞬时值低2.87％;即,氢原子能明显地增高纯镍的弹性模量。 关键词：

EFFECT OF HYDROGEN ON YOUNG'S MODULUS OF NICKEL

A Bordoni type apparatus was used to measure the relative changes of the apparent Young's modulus and elastic strain of a sustained displacement specimen during aging at room temperature after charging with hydrogen or artificial partial stress relaxation. The Young's modulus was gradully increasing and the elastic strain decreasing during aging after artificial partial stress relaxation. However, the situation was just opposite during aging after charging, i.e., the Young's modulus was gradually decreasing and the elastic strain increasing. It has been proved that the presence of nickel hydride brings about the increase of the Young's modulus of pure nickel due to the change of chemical bond. The decomposition of hydride and escaping of hydrogen atoms from the specimen during aging after charging cause the decrease of the Young's modulus of nickel.