DYNAMIC MECHANICAL BEHAVIOR OF Fe3Al UNDER TENSILE IMPACT

The loading tests of Fe 3Al under tensile impact have been carried out by a self designed rotating circular disk tensile impact apparatus. An experimental study of Fe 3Al in the strain rate range from 80 s -1 to 1 200 s -1 was performed and the complete stress strain curves under tensile impact were obtained. On the basis of the experimental results, it is believed that Fe 3Al obviously exists dynamic ductility and effect of strain rate hardening. The yield strength, ultimate strength and failure strain increase with increasing strain rate. Based on the linear least squares fit, the relationship between the yield strength, ultimate strength, failure strain and strain rate under tensile impact was obtained. At the same time, one dimensional macro constitutive equation for Fe 3Al under tensile impact according to the elastic viscoplastic constitutive theory was derived.