Journal of Materials Science, Vol.29, No.24, 6581-6586, 1994
Superplastic Behavior of a Ceramic-Based Kappa-Alpha-Fe-10Al-1.9C Material
A fine microstructure has been developed in a Fe-10Al-1.9C material made from rapidly solidified powders. The compacted material had a microstructure containing about 50 vol% kappa phase (Fe3AlC(x)) and 50 vol% alpha phase. The creep behaviour of the material was investigated using tension and compression change in strain rate tests and elongation to failure tests. Stress exponents of 2-3 were obtained over a wide range of strain rates, and an average activation energy for creep of 245 kJ mol-1 was determined. A maximum elongation to failure of 1120% was obtained at 900-degrees-C. The tensile ductility as a function of strain rate was found to follow the same behaviour of other ceramic materials wherein the elongation to failure decreases sharply with an increase in strain rate.