节点文献
金属玻璃Pd79.5Ni4Si16.5结晶化过程的慢正电子束研究
Research for Crystallization of Metallic Glass Pd79.5Ni4Si16.5 by Slow Positron Beam
【摘要】 首次用单能慢正电子束研究金属玻璃的晶化过程。测量了金属玻璃Pd79.5Ni4Si16.5淬火态、结构弛豫和结晶化状态样品的正电子湮没辐射多普勒展宽能谱与正电子入射能量的函数关系,结果表明,淬态金属玻璃Pd79.5Ni4Si16.5中存在大量的空位型缺陷,其结晶化过程最先开始于表面层。单能慢正电子束是研究金属玻璃晶化过程的有效手段。
【Abstract】 The monoenergetic slow positron beam was first used to study the crystallization process of metallic glasses. The measurement of Doppler broadening spectra as a function of positron energy was made on the samples of metallic glass Pd79.5 Ni4 Si16.5 in various states. It is shown that there are a number of the vacancy-like defects in the as- quenched state sample. Its crystallization started at the sample surface. Slow position beam turned out to be an effec(?)ive probe to study the structural change of metallic glasses.
- 【文献出处】 高能物理与核物理 ,High Energy Physics and Unclear Physics , 编辑部邮箱 ,1993年04期
- 【被引频次】1
- 【下载频次】34