中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 8 No. 2 June 1998 |
(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