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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 2    June 1998

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DEFORMATION BEHAVIOR OF FeAl INTERMETALLIC ALLOY AT ELEVATED TEMPERATURES
Li Dingqiang, Lin Dongliang and Liu Yi

Department of Materials Science, Open Laboratory ofEducation Ministry of China for High Temperature Materials and Tests, ShanghaiJiao Tong University, Shanghai200030, P. R. China

Abstract:The mechanical properties of Fe-36.5% Al (mole fraction) intermetallic alloy at elevated temperatures were measured. The results indicate that the specific elongation of the alloy increases significantly with the temperature increasing from 600℃to 1000℃and the maximum of specific elongation is up to 115% when the alloy is deformed at 1000℃. The dislocation features in the alloy were also investigated by transmission electron microscopy (TEM). There exist not only a large number of gliding dislocation lines but also a number of helical dislocations in FeAl alloy after deformed at elevated temperatures. All of these dislocations have a Burgers vector of〈111〉. The climb motion as well as the glide motion of dislocations with〈111〉Burgers vector is responsible for a good ductility of FeAl alloy deformed at elevated temperatures.

 

Key words: FeAl intermetallic alloy mechanical property dislocation

ISSN 1672-7029
CN 43-1423/U

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