Abstract
The oxidation-induced embrittling mechanism of 95W-Ni-Fe alloy has been studied by X-ray photo-electron spectroscopy (XPS) and scanning Auger microprobe (SAM). Results show that when the alloy oxidizes, WO2 and WO3 form around the surface of tungsten particles, and Fe in the bonding phase oxidizes into Fe2O3 and FeO on the surface layer of the specimen; thus, surface layer embrittlement occurs as a result of bonding failure between the W particle and the bonding phase. The O diffuses into the matrix of the alloy along interfaces and predominantly segregates on some interfaces, and at the same time, O oxidizes Fe in the bonding phase, thus leading to interface embrittlement and the formation of a bulgy spheroidal fracture.
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