Abstract
Abstract The mechanical properties of Fe–28Al under a strain rate ranging from 10 −4 to 1300 s −1 were tested in air and water at room temperature. The ductility, yield stress and ultimate stress of Fe–28Al are sensitive to the strain rate and gradually increase with strain rate in all test ranges. The fracture surface observations indicated that the fracture mode of Fe–28Al varies from complete transgranular fracture to a mixture of transgranular cleavage and intergranular fracture with strain rate increasing from 10 −4 to 1300 s −1 . It is proved that environmental embrittlement is a main factor controlling the ductility of Fe–28Al, even at high strain rate, and grain boundaries play different roles in the ductility of Fe–28Al at low and high strain rate.
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