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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 3    September 1995

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GRAIN BOUNDARY SEGREGATION AND INTERGRANULAR BRITTLENESS IN HIGH STRENGTH ALUMINIUM ALLOY
Song Renguo; Zheng Meiguang

Deparrment of Materials Science; Northeastern University; Shenyang 110006

Abstract:Effects of magnesium and hydrogen to grain boundary on the fracture energy in 7050high strength aluminium alloy have been calculated using the quasichemical approach. The results indicated that both Mg and H segregation induce the intergranular fracture energy decrease, thus resulting in grain boundary embrittlement, and the embrittlement degree induced by hydrogen is larger than that of magnesium. This conclusion corresponds with the experimental results.

 

Key words: high strength aluminium alloy; grain boundary segregation; intergranular brittleness

ISSN 1672-7029
CN 43-1423/U

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