INVESTIGATION OF GRAIN BOUNDARY SEGREGATION AND HYDROGEN-INDUCED FRACTURE MECHANISM IN HIGH STRENGTH ALUMINUM ALLOY
Song Renguo(Northwestern Polytechnical University)Zhang Baojin ;Zeng Meiguang(Northeastern University )(Correspondent: Song Renguo, Postdoctor, State Key Laboralory of Solidification Processing, Northwestern Polylechnical University, Xi' an (710072)
The model of grain boundary segregation and intergranular fracture for a trinary alloy was proposed in this paper. The effects of Mg, H grain boundary segregation on intergranular fracture work in high strength aluminum alloy were investigated by using the model combined with quasichemical theory. The results indicated that both Mg and H segregation result in a decreas of the intergranular fracture energy and hydrogen embrittles grain boundary more intense than magnesium does,which is consistent with the experimental results of stress corrosion for 7075 aluminum alloy.
【CateGory Index】： V25