Abstract
Embrittlement of α-irradiated AISI 316 stainless steel specimens was measured at high temperature, with particular reference to its dependence on the strain rate. Effects of irradiation on the total elongation gradually decreased with increasing strain rate but was discernible at strain rates lower than 4.2 × 10 −2s −1 at 700°C. Observations by transmission electron microscopy lead to the surmise that helium bubbles at rapid strain rates did not gather along grain boundaries as in the case with slow strain rates. Hence, a mechanism to explain the gathering of helium bubbles along grain boundaries during straining, bubble sweeping by moving dislocations, seems to be most plausible.
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