EFFECT OF STRAIN-RATE ON BEHAVIOR OF FE3AL UNDER TENSILE IMPACT

The effect of strain rate on the behaviour of Fe3Al has been investiga ted experimentally in the range 90-1300 s(-1) under tensile impact. Th e experimental results indicate that Fe3Al is strain-rate sensitive an d its critical strain in maximum stress increases with increasing stra in rate. According to the test results for Fe3Al in air and water, it is confirmed that environmental embrittlement induced the fracture of Fe3Al under tensile impact. With testing at faster strain rate, furthe r hydrogen embrittlement is suppressed. This is consistent with the mi crography of the fracture surface in Fe3Al specimens, which indicates that these iron aluminides are intrinsically quite ductile.