AN X-RAY-DIFFRACTION AND COMPUTER-SIMULATION STUDY OF [111] TWIST BOUNDARIES IN GOLD

被引:5
作者
MAJID, I
BRISTOWE, PD
机构
[1] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA
来源
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1992年 / 66卷 / 01期
关键词
D O I
10.1080/01418619208201514
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Quantitative X-ray diffraction measurements have been made from a series of (111) gold bicrystals containing twist grain boundaries with controlled geometry. Each bicrystal was prepared at a specific angle of misorientation theta-degrees but because of double positioning both theta-degrees and 60-theta-degrees twist boundaries were present in the specimens. Since these pairs of boundaries have distinct structures, the intensity measurements from each bicrystal contained superimposed information representing an average from both boundary types. In order to understand these measurements in terms of the boundary structures involved, computer calculations were performed to characterize the theoretical scattering effects expected from [111] twist boundaries related by double positioning. By comparing the measurements with the calculations, it was possible to determine the conditions under which reliable structural information concerning doubly positioned twist boundaries could be obtained. From an appropriate analysis of the data, it was concluded that [111] twist boundary displacement fields are generally weak, rotational in form, and centred on '0' lattice sites.
引用
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页码:73 / 87
页数:15
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