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Effects of Neutron Irradiation on Mechanical Properties of Iron-Nitrogen Alloys

机译：中子辐射对铁 - 氮合金力学性能的影响

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Fe-N alloys containing 150 ppm N were neutron irradiated in the JMTR to 5.5×1019 n/cm2, then deformed in tension at temperatures ranging from that of liquid nitrogen to 250°C. Irradiation was found to increase markedly the yield, tensile and fracture stresses, and to decrease the elongation. Irradiation further had the effect of shifting upward the range of testing temperature in which serrations appeared in the stress-strain diagram, and to lower the work hardening coefficient. The alloys were examined by transmission electron micrography both as irradiated and after being deformed to observe the changes in internal structure. Irradiation was found not to induce deffects in the iron matrix ; the precipitates, on the other hand, revealed in some parts the presence of radiation defect clusters.Heat treatment at 300°C for 100 hr removed the precipitates in the irradiated specimens, leaving many dislocation loops in the matrix. These dislocation loops were of the vacancy type with Burgers vectors corresponding to a/2 , and lay on the {111} plane. Radiation anneal hardening was observed in the irradiated specimens in the occurred range of heat treatment temperature between 100 and 600°C. It would appear that the stable phase Fe4N and the remaining entangled dislocations tend to enhance the hardening due to the post-irradiation annealing, with an effect similar to that produced by nitrogen. vacancy complexes, interstitial cluster, metastable precipitates and dislocation loops.
机译：含有150ppm n的Fe-n合金在JMTR中辐照的中子中子，然后在液体氮的温度下在张力下变形为250℃。发现辐射显着增加产率，拉伸和断裂应力，并降低伸长率。辐射进一步具有向上移动的效果，其中锯齿出现在应力 - 应变图中，并降低工作硬化系数。通过辐照和变形以观察内部结构的变化，通过透射电子显微镜检查合金。发现辐照不会在铁基质中诱导脱义;另一方面，沉淀物在某些部件中揭示了辐射缺陷簇的存在。在300℃下处理100小时，除去辐照样品中的沉淀物，在基质中留下许多位错环。这些位错环是空位类型，其中汉堡矢量对应于A / 2，并铺设在{111}平面上。在辐射的标本中观察到辐射退火硬化在100-600℃之间发生的热处理温度范围内。似乎稳定的阶段Fe4N和剩余的缠结位错倾向于增强由于后照射后退火引起的硬化，其效果类似于氮气产生的效果。空位复合物，间质簇，亚稳沉淀物和位错环。

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