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The Mechanical Properties of Fe-36.5Al and its Cr or ti Containing Alloys at Elevated Temperature

Published online by Cambridge University Press:  22 February 2011

Dingqiang Li ,
Yi Liu ,
Aidang Shan  and
Dongliang Lin
Dingqiang Li
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
Yi Liu
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
Aidang Shan
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
Dongliang Lin
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
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Abstract

The mechanical properties of B2 structural FeAl alloys, prepared by hot rolling, at elevated temperatures have been measured by tensile tests. The alloys of Fe-36.5at.%A1, Fe-36.5at.%A1-5at.%Cr and Fe-36.5at.%Al-2at.%Ti were taken for tensile tests at a temperature range from room temperature to 1000°C. The fracture surfaces of these alloys were observed by SEM. The results showed that elongations of these alloys increased with increasing temperature when the testing temperatures were above 600°C. All the maximum elongations of these alloys appeared at 1000°C and those of Fe-36.5A1, Fe-36.5Al-5Cr, and Fe-36.5Al-2Ti alloys were 120%, 183% and 208% respectively. Fracture surfaces showed that failure of these alloys was by a combination of intergranular fracture and transgranular cleavage below 700°C. but showed a ductile fracture above 700°C. The ductility and strength of ternary alloys were higher than that of binary FeAl alloy at elevated temperatures, especially at high temperature. The <111> dislocations and helices have been observed in Fe-36.5A1 alloy by TEM. The large elongation of FeAl alloy at high temperature resulted from <111> dislocations slipping and <111> helices climbing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 231
Copyright
Copyright © Materials Research Society 1995

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