LOCAL MAGNIFICATION EFFECTS IN THE ATOM PROBE

被引:224
作者
MILLER, MK [1 ]
HETHERINGTON, MG [1 ]
机构
[1] UNIV OXFORD,DEPT MAT,OXFORD OX1 3PH,ENGLAND
关键词
D O I
10.1016/0039-6028(91)90449-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Differences in the local magnification and curvature of phases in field evaporated field ion specimens have been shown to be an important consideration in atom probe analysis. A series of experiments has been performed on a high purity iron-45% chromium alloy that has been aged within a low temperature miscibility gap to produce a chromium-enriched alpha' phase and an iron-rich alpha phase. The effects of local magnification on field ion and field evaporation microscopy, and on three-dimensional and probe aperture atom probe analyses are discussed. It has been shown that the average composition of an atom probe experiment should be calculated from the number of atoms of each element divided by the total number of atoms but that the distance scale should be determined from distance-monitored type experiments. The reason for this is that the greater number of atoms per unit area in a darkly imaging region exactly compensates for the reduced probability of being sampled by the probe aperture.
引用
收藏
页码:442 / 449
页数:8
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