SURFACE SEGREGATION IN A NI-1 AT-PERCENT PD ALLOY

被引：36
作者：
MERVYN, DA
BAIRD, RJ
WYNBLATT, P
机构：
[1] COLUMBIA UNIV,HENRY KRUMB SCH MINES,NEW YORK,NY 10027
[2] FORD MOTOR CO,RES STAFF,DEARBORN,MI 48121
来源：
SURFACE SCIENCE | 1979年 / 82卷 / 01期
关键词：
D O I：
10.1016/0039-6028(79)90319-4
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：
The surface composition of a Ni-1 at% Pd alloy has been determined by Auger electron spectroscopy after equilibration of the alloy at several temperatures in the range 550 to 800°C. Moderate segregation of Pd to the surface of the alloy has been observed, with concentrations of up to ~∼30 at% being detected at the surface after equilibration at 550°C. The heat of segregation (or adsorption) of Pd has been found to agree reasonably well with the predictions of a previously developed unified model of surface segregation in alloys. The kinetics of Pd segregation to the surface have also been measured between 500 and 700°C. Analysis of the kinetic data yields apparent diffusivities of Pd through the alloy that are suggestive of a dominant grain boundary transport mechanism. © 1979.
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页码：79 / 92
页数：14
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