Formation and time dynamics of hydrogen-induced vacancies in nickel
Formation and time dynamics of hydrogen-induced vacancies in nickel
复制标题
镍中氢致空位的形成和时间动态
DOI：
10.1016/j.actamat.2021.117264
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
M. Fujinami
中科院分区：
文献类型：
--
作者：
L. Chiari;K. Kojima;Y. Endo;H. Teshigahara;M Butterling;M.O. Liedke;E. Hirschmann;A.G. Attallah;A. Wagner;M. Fujinami
采用正电子湮没寿命谱（帕尔斯）研究了镍中氢致缺陷的形成，并利用超高通量慢正电子束以前所未有的分钟级时间分辨率跟踪了这些缺陷在室温时效过程中的时间动态。这些测量结果表明，在室温下，仅仅通过氢的加入就形成了大量的原子空位。低温帕尔斯测量表明它们是单空位缺陷，低温符合多普勒展宽测量证明氢在充氢过程中被捕获并束缚在这些空位上。室温老化，即低于阶段III的温度在镍，和伴随的氢解吸诱导这些单空位成大的空位簇，仍然存在，即使在所有的氢已经解吸和氢已经消失。这些结果构成的第一个经验证据表明，空位-氢复合物诱导Ni只有氢充电，并表明，氢有一个主要的作用，即使在室温下形成和稳定的空位。
The formation of hydrogen-induced defects in nickel was investigated by positron annihilation lifetime spectroscopy (PALS) and the time dynamics of those defects during room temperature aging was tracked with an unprecedented time resolution of the order of minutes using an ultrahigh-flux slow positron beam. Those measurements showed the formation of a large number of atomic vacancies simply by hydrogen addition at room temperature. Low-temperature PALS measurements indicated that they were monovacancy-level defects and low-temperature coincidence Doppler broadening measurements proved that hydrogen was trapped and bound to those vacancies during the hydrogen charge. Room temperature aging, i.e. below the stage III temperature in Ni, and the concomitant hydrogen desorption induced the agglomeration of those monovacancies into large vacancy clusters which remained even after all the hydrogen had desorbed and hydrides had disappeared. These results constitute the first empirical evidence that vacancy-hydrogen complexes are induced in Ni only by hydrogen charging and demonstrate that hydrogen has a primary role in the formation and stabilization of vacancies even at room temperature.
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