机械合金化AlCuFe经退火形成准晶体的结构变化
Structural evolution in annealing of mechanically alloyed AlCuFe icosahedral quasicrystal
卞清 1王晓 1张明 1李媛媛 2徐云玲3
作者信息
- 1. 解放军理工大学理学院,江苏南京211101
- 2. 中国科学技术大学国家同步辐射实验室,安徽合肥230029
- 3. 河海大学理学院,江苏南京210098
- 折叠
摘要
为了研究AlCuFe准晶体的形成机理,采用了X射线衍射(XRD)和扩展X射线吸收精细结构(EXAFS)2种分析技术,有效地克服了高度无序体系结构分析的困难.研究结果表明,在球磨过程中Cu原子进入Al的晶格点阵,经过不同球磨时间分别形成金属间化合物Al2 Cu或者Cu9 Al4,而Fe原子保持原来的体心立方(bcc) α-Fe结构不变；退火处理可以驱使α-Fe与Al和Al-Cu化合物反应,主要的产物分别为Al7 Cu2 Fe化合物或者Al(Cu,Fe)固溶体；最后,在较高的温度下Al7Cu2Fe转变为Al65 Cu20 Fe15准晶体.
Abstract
To study the mechanism of AlCuFe quasicrystalline (QC) formation, the x-ray diffraction (XRD) and x-ray absorption fine structure (XAFS) were adopted. The combination of both the methods success fully overcame the difficulties in the analysis of the highly disordered structures. The results indicate that during the milling process, only Cu can incorporate into the lattice of Al to form an Al2Cu or Cu9Al4, which depends on the milling times. Fe remains the original structure of bcc α-Fe. However, annealing can drive the o-Fe to react with Al and Al-Cu compounds. The main products are Al7Cu2Fe compound or Al (Cu, Fe) solid solution, respectively. Then at higher temperature the Al7Cu2Fe transforms into the icosa hedral Al55Cu20Fe15 quasicrystal.
关键词
X射线衍射/X射线吸收精细结构/机械合金化Key words
XRD/XAFS/mechanical alloying引用本文复制引用
基金项目
教育部创新计划同步辐射研究生创新基金(20090152S)
出版年
2011
NETL
NSTL
维普
万方数据