Heavy-ion irradiation of α-iron

The temperature dependence of heavy-ion damage in iron: A microstructural transition at elevated temperatures

“…In these and other experiments there does seem a clear pattern for <100> loops to predominate in pure Fe at irradiation temperatures T irr ≥ 400 o C. In contrast, in Fe irradiated at 60 o C with neutrons, only ½<111> loops were identified, again of interstitial nature [16]. The only examples we know of <100> loops in low-temperature irradiations are found in Fe irradiated with W + ions at room temperature [17] and with high doses of self-ions [18], and in these cases loops were considered to have formed by a process of cascade collapse and the loop nature was vacancy.…”

Heavy-ion irradiations of Fe and Fe–Cr model alloys Part 2: Damage evolution in thin-foils at higher doses

“…The production of vacancy loops by the collapse of individual cascades has been seen in experiments on pure Fe irradiated with Xe + and other very heavy ions [10]. Cascade collapse is therefore possible in Fe, but probably only in cascades which result in higher vacancy concentrations and energy densities than those produced by self-ions.…”

Anomalous bias factors of dislocations in bcc iron

“…The latter are of interstitial 51 nature and two types may be present depending on the chemical composition 52 of the Fe-based alloy and irradiation temperature. In pure Fe at 573 K and 53 above, the a 0 100 loops of square shape dominate, while at room tempera-54 ture mostly a 0 /2 111 loops are present [12,10]. In commercial Fe-Cr-based 55 steels both types of loops are present in proportions depending on the Cr 56 content [13,14].…”