Z.J. Zhan
,
X.X. Ma
,
Y. Sun and L.F. Xia School of Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China
金属学报(英文版)
Aluminum alloy 2024 has been implanted with nitrogen ions at various doses by plasma based ion implantation (PBII). The introduction of energetic ions caused structural change within the near surface region of the solid. The samples have been characterized by X ray Photoelectron Spectroscopy at various depths. The chemical states of Al and N were identified by deconvolution of the recorded XPS spectra. After plasma based ion implanted nitrogen into aluminum, not only the AlN precipitates but also supersaturated solution of nitrogen formed. The presence of aluminum in different chemical states corresponding to Al, AlN and Al 2O 3. The majority of nitrogen participates in the form of the supersaturated solution. With the increase of nitrogen dose, the amount of AlN precipitates increased.
关键词:
plasma based ion implantation
,
null
,
null
,
null
杨鲁岩
,
李双明
,
高卡
,
钟宏
,
傅恒志
稀有金属材料与工程
羽状晶是铸造组织中与柱状晶、等轴晶并列的第三类组织,在凝固理论研究和工业应用中有重要价值.近年来研究表明孪生枝晶是羽状晶最基本的微观组织特征.综述了孪生枝晶尖端形貌、增殖机制、与常规枝晶的竞争生长规律以及羽状晶力学性能等方面的研究进展,讨论了不同因素对孪生枝晶形成和生长的影响,总结了研究中尚未解决的问题.
关键词:
羽状晶
,
孪生枝晶
,
铝合金
,
定向凝固
