We present results of a weak-beam transmission electron microscopy study of "matrix damage" in two nearly-pure irons (designated alloys 1A and 2A) produced by neutron irradiation to a fluence of 0.06 dpa at 280°C. The matrix damage in both materials was found to consist of small (2-6 nm) dislocation loops. About 80% have Burgers vectors b = a<100>, and the remainder have b = a/2<111>. The loops in alloy 1A have a mean image size d{sub}(mean)= 2.8±0.1 nm and a mean maximum image size d{sub}(max)= 4.2 ± 0.3 nm, while those in 2A have d{sub}(mean) = 3.4 ± 0.1 nm and d{sub}(max) = 4.5 ± 0.3nm. The number densities are about 8.5 × 10{sup}21 m{sup}-3 in alloy 1A, and 6.6 × 10{sup}21 m{sup}-3 in 2A. It can be shown that the loops can account for the observed irradiation hardening. At least some loops are stable under thermal annealing to temperatures of at least 430°C. This and other indirect evidence suggests that their nature is interstitial.
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机译：我们在由中子辐射产生的两个接近纯熨斗（指定合金1A和2A）中的“基质损伤”中的弱束透射电子显微镜研究的结果呈现为280℃的0.06dPa的流量。发现两种材料中的基质损伤由小（2-6nm）的位错环组成。大约80％的汉堡载体B = A <100>，其余的具有B = A / 2 <111>。合金1a中的环路具有平均图像尺寸d {sub}（平均值）= 2.8±0.1nm和平均最大图像尺寸d {sub}（max）= 4.2±0.3nm，而2a中的那些有d {sub} （平均值）= 3.4±0.1nm和d {sub}（max）= 4.5±0.3nm。数量密度为合金1a中的8.5×10 {sup} 21 m {sup} -3，以及2a中的6.6×10 {sup} 21 m {sup} -3。可以表明，环路可以考虑观察到的照射硬化。在热退火下，至少一些环稳定到至少430℃的温度。这种间接证据和其他间接证据表明他们的性质是夸大其语。
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