Abstract
Transmission electron microscopy with in-situ ion irradiation has been used to examine dislocation loop formation during self-ion irradiation of pristine W and samples pre-implanted with He. Dislocation loops with b = ±½〈111〉 and b = 〈100〉 were observed in both the pristine W and samples pre-implanted with He. This contrasts previous works with He/H ion irradiation where no b = 〈100〉 type loops have been observed in W. The b = 〈100〉 dislocation loops form during the cascade and He has no effect on the type of dislocation loop formed; unlike b = 〈100〉 type loop nucleation in FeCr alloys.
Highlights
Eyre and Bullough [7] reported that two types of interstitial loops were present in irradiated body-centred cubic (BCC) Fe alloys: b = 1⁄2〈111〉 and b = 〈001〉
In our previous work [2,3] using He ion irradiation, the dislocation loop population in W is dominated by b = 1⁄2〈111〉 type with no b = 〈001〉 being observed
Yi et al [18] found the fraction of b = 〈100〉 type loops decreased with increasing irradiation temperature and almost no 〈100〉 loops were observed at 800 °C
Summary
In our previous work [2,3] using He ion irradiation, the dislocation loop population in W is dominated by b = 1⁄2〈111〉 type with no b = 〈001〉 being observed. Matsui et al [4] reported the formation of dislocation loops with b = ±1⁄2〈111〉 type in only W and Mo samples irradiated with 10 keV D ions at room temperature to fluences of 3 × 1018 ions/cm2.
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