Factors Controlling Irradiation Hardening of Iron-Copper Model Alloy
Factors Controlling Irradiation Hardening of Iron-Copper Model Alloy
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DOI：
10.2320/matertrans.45.338
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发表时间：
2004-02
影响因子：
1.2
通讯作者：
T. Kudo;R. Kasada;A. Kimura;K. Hono;K. Fukuya;H. Matsui
中科院分区：
文献类型：
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作者：
T. Kudo;R. Kasada;A. Kimura;K. Hono;K. Fukuya;H. Matsui
通过硬度测量、正电子湮没谱(PAS)测量、透射电子显微镜(TMM)观察和三维原子探针(3DAP)分析等辐照后退火实验，确定了纯铁和Fe-0.15质量%铜合金辐照硬化的控制因素及其对辐照硬化的贡献。纯铁经773K退火热处理后，硬度几乎完全恢复，同时伴随着辐照后观察到的间隙型位错环(1-环)的脱落。与之相反，Fe-0.15mAs%Cu合金的硬化过程分两步恢复，773K的硬化约为773K的一半，973K的硬化完全恢复。辐照后的大部分I-环在773K后再次出现，这清楚地表明1-环是控制铁-铜合金辐照硬化的主要因素之一。3DAP分析表明，Fe-0.15质量分数铜合金在773K退火热处理后的残余硬化是由富铜沉淀(CRP)引起的，约为辐照硬化的一半。PAS测试表明，硬度参数和寿命参数的恢复行为不一致。根据定量的数据分析，认为控制纯铁辐照硬化的因素是I环，而Fe-0.15质量%铜合金中的I环和CRP对辐照硬化的贡献几乎相同。
The factors controlling irradiation hardening and their contributions to the hardening in electron irradiated pure-iron and Fe-0.15 mass%Cu alloy were determined by means of post-irradiation annealing experiments, such ashardness measurements, positron annihilation spectroscopy (PAS) measurements, transmission electron inl rottope (TMM) observations and three dimensional atom probe (3DAP) analyses, In pure-iron, almost complete recovering of the hardness was obterved after the annealing to 773 K, which was accompanied by disapearing of the interstitial type dislocation loops (1-loops) that were observed in as-irradiated specimen. In contrast, the hardening of Fe-0.15 mas %Cu alloy recovered in a two-step mode; about a half of the hardening recovered by the 773 K annealing, and a complete recovety was observed after annealing to 973 K. Most of the I-loops observed in as-irradiated specimen again elisappeared after the annealing to 773 K. These clearly show that the 1-loops are one of the main factors controlling irradiation hardening in iron-copper alloy. The residual hardening in the Fe-0.15 mass%Cu alloy after the annealing to 773 K, which is about a half of the irradiation hardening, was attributed to the copper-rich precipitates (CRP) through the direct observation by 3DAP analysis. PAS measurements revealed the disagreement between the recovery behaviors of the hardness and lifetime parameters. Based on the quantitative data analysis, it was concluded that the factor controlling the irradiation hardening of pure-iron is the I-loops, and those in Fe-0.15 mass%Cu alloy are both the I-loops and CRP of which the contributions to the hardening are almost same.