The temperature dependence of heavy-ion damage in iron: a microstructural transition at elevated temperatures
Résumé
We describe a transition in the dislocation microstructure of pure Fe produced by heavy-ion irradiation of thin foils which took place between irradiation temperatures Tirr of 300oC and 500oC. At Tirr ≤ 400oC, the microstructure was dominated by round or irregular non-edge dislocation loops of interstitial nature and with Burgers vectors b = ½<111>, although interstitial <100> loops were also present; at 500oC only rectilinear pure-edge <100> loops occurred. At intermediate temperatures there was a gradual transition between the two types of microstructure. At temperatures just below 500oC, mobile ½<111> loops were seen to be subsumed by sessile <100> loops. A possible explanation of these observations is given.
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