Open AccessXPS STUDY OF Cu PRECIPITATIONS AT THE SURFACE OF CRYSTALLINE Cu-Zr ALLOYS AFTER ANNEALING IN HYDROGEN
Author(s) -
Xin Yu
Publication year - 1991
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.40.1501
Subject(s) - materials science , x ray photoelectron spectroscopy , annealing (glass) , hydrogen , chemisorption , copper , alloy , analytical chemistry (journal) , metallurgy , chemical engineering , chemistry , adsorption , organic chemistry , chromatography , engineering
Crystalline Cu-Zr alloys of various composition were annealed (200-400℃) in ultra-high vacuum and in hydrogen, and their surface composition was analyzed by X-ray photoelec-tron spectroscopy. Contrary to the mostly observed oxygen induced surface segregation of Zr we found strong Cu segregation after annealing Cu-rich sample in hydrogen atmosphere. Scanning electron micrographs show surface Cu precipitates, apparently formed due to the effect of the heat of chemisorption of hydrogen on Cu.