Formation of Cu precipitates and vacancy clusters in neutron-irradiated Fe–Cu alloys
Formation of Cu precipitates and vacancy clusters in neutron-irradiated Fe–Cu alloys
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DOI：
10.1080/09500830802014643
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发表时间：
2008-05
影响因子：
1.2
通讯作者：
Q. Xu;T. Yoshiie;K. Sato
中科院分区：
文献类型：
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作者：
Q. Xu;T. Yoshiie;K. Sato
两种 Fe-Cu 二元模型合金 Fe-0.3Cu 和 Fe-0.6Cu 在~573 K 下用裂变中子进行辐照，剂量范围为 4 × 10−6 至 0.16 dpa（每个原子的位移），以研究 Cu 沉淀物的形成和微观结构演化。 Cu含量仅在低剂量时影响Cu沉淀物和微孔的形成。在 Fe-0.3Cu 中，微孔和 Cu 沉淀的形成分别在 1.2 × 10−4 和 4 × 10−5 dpa 的剂量下开始。另一方面，Fe-0.6Cu 中的微孔在剂量为 4 × 10−4 dpa 时开始形成，甚至在照射至 4 × 10−6 dpa 后仍形成 Cu 沉淀物。进一步照射后，铜沉淀物和微孔形成的差异很小。在两种合金中，随着辐照剂量增加至 3 × 10−3 dpa，微孔逐渐增大。在 3 × 10−3 dpa 至 1.6 × 10−2 dpa 的照射下，铜原子发生显着聚集，微孔收缩。在两种合金中，当剂量高于 1.6 × 10−2 dpa 时，Cu 沉淀物不再生长，微孔在基体中成核并生长。目前的研究清楚地揭示了铜沉淀物和微孔的形成和生长与辐照剂量之间的关系。
Two Fe–Cu binary model alloys, Fe–0.3Cu and Fe–0.6Cu, were irradiated with fission neutrons at doses ranging from 4 × 10−6 to 0.16 dpa (displacements per atom) at ∼573 K to investigate the formation of Cu precipitates and microstructural evolution. The Cu content only affected the formation of Cu precipitates and microvoids at low doses. In Fe–0.3Cu, the formation of microvoids and Cu precipitates initiated at doses of 1.2 × 10−4 and 4 × 10−5 dpa, respectively. On the other hand, the formation of microvoids started at a dose of 4 × 10−4 dpa in Fe–0.6Cu, and Cu precipitates were formed even after irradiation to 4 × 10−6 dpa. On further irradiation, the difference in the formation of Cu precipitates and microvoids was small. Microvoids grew with increasing irradiation dose up to 3 × 10−3 dpa in both alloys. Prominent aggregation of Cu atoms occurred upon irradiation from 3 × 10−3 to 1.6 × 10−2 dpa and the microvoids shrank. The Cu precipitates no longer grew, and microvoids nucleated and grew in the matrix above a dose of 1.6 × 10−2 dpa in both alloys. The present studies clearly reveal the relationships between the formation and growth of Cu precipitates and microvoids with irradiation dose.