应用正电子湮没技术研究多晶形变镍中氢和缺陷的互作用

本文采用正电子湮没的多普勒展宽方法,研究冷轧形变镍中阴极充氢后氢与缺陷的互作用行为。实验结果表明:冷轧镍电解充氢以后其S参数显著上升,S参数上升量的大小取决于试样内部的空位浓度,与位错密度的大小关系不大。由此提出氢与空位互作用形成以氢为核心的空位团的机制,解释了实验中观察到的现象。

POSITRON ANNIHILATION STUDY ON THE INTERACTION BETWEEN HYDROGEN ATOMS AND DEFECTS IN COLD-ROLLED NICKEL

The interaction between hydrogen atoms with defects in coldrolled nickel is investigated by Doppler broadening measurement. Experimental results show that the S-parameter in cold-rolled-hydrogen-charged nickel increases as compared with that of hydrogen-free cold-rolled nickel. And the increament of S-parameter depends on vacancy concentration, being almost independent of dislocation density. It is suggested that hydrogen atoms can act as centers of vacancy agglomeration, leading to the formation of vacancy cluster.