DYNAMICAL PROCESS OF BUBBLES AND PRECIPITATION IN GRAIN BOUNDARIES IN PLASMA FACED MATERIALS

等离子体表面材料晶界中气泡和沉淀的动态过程

• 批准号: 10680472
• 负责人: ONO Kotaro
• 金额: $ 2.18万
• 依托单位: SHIMANE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680472/
• 关键词: helium bubble; ion irradiation; fusion reactor materials; Fe-Cr alloy; Fe-Cr-Ni alloy; SiC; electron microscopy; grain boundary precipitation; ヘリウム バブル; ヘリウムバブル; ステンレス鋼; ヘリウム; バブル; プラズマ対向材料; オーステナイト鋼; 拡散; 格子欠陥; 照射損傷

In order to develop the plasma faced materials, damage and voids(or bubbles)swelling evolution process in plasma faced materials, such as austenitic model alloy, ferritic model alloy, SiC, Al_2O_3, Fe, Ni and Al, have been studied by in-situ electron microscopy with ion accelerator. It was found in Ni, Fe and Al irradiated with helium or hydrogen ions that the nucleation of interstitial type dislocation loops was enhanced by trapping of the self-interstitial atoms at helium. (or hydrogen) ・ vacancy complexes. The coarsening of the bubbles took place in all materials examined through their coalescence during their Brownian motion. The diffusivity of the bubble and its size and temperature dependence was measured according to the random walk theory. Helium bubble precipitation and rapid motion along grain boundaries was found out. To examine the precipitation of the alloy elements, STEM-EELS analysis was carried out. It was clarified that Cr was depleted and Ni was enriched on the bubble surface in Fe-16Cr-17Ni austenitic alloy. However, Cr was enriched on the bubble surface in ferritic Fe-9Cr alloy. Effects of the segregated alloy elements on the bubble mobility was suggested. Helium bubbles in SiC and Al_2O_3 matrixs were stable up to 1100K, but they precipitabed and easily coarsened along grain boundaries.

为了开发等离子表面材料，国内外学者对奥氏体模型合金、铁素体模型合金、SiC、Al_2O_3、Fe、Ni、Al等等离子表面材料的损伤和空洞(或气泡)膨胀演化过程进行了研究。用离子加速器进行原位电子显微镜观察发现，Ni、Fe、Al在氦或氢离子照射下，出现了间隙型位错的形核。通过在氦（或氢）处俘获自填隙原子，气泡的粗化发生在通过其布朗运动过程中的聚结检查中。根据随机游走理论测量了氦气泡析出和沿晶界的快速运动，并进行了 STEM-EELS 分析。 Fe-16Cr-17Ni 奥氏体合金中 Cr 贫化，Ni 富集，而铁素体 Fe-9Cr 合金中 Cr 富集在气泡表面。 SiC和Al_2O_3基体中的氦气泡在1100K以下都很稳定，但它们沿晶界析出并容易粗化。

项目成果

K.Arakawa et al.: "Elongation fracture of metals containing pre-introduced secondary defects"Radiation Effects and Defects in Solids. (in press). (2001)

K.Arakawa 等人：“含有预先引入的二次缺陷的金属的伸长断裂”固体中的辐射效应和缺陷。

小野 興太郎 他: "Fe-16Cr-17Ni中のヘリウムバブルの動的挙動のその場観察" 日本金属学会春期大会予稿集. S.7 (1999)

Kotaro Ono 等人：“Fe-16Cr-17Ni 中氦气泡动态行为的原位观察”日本金属学会春季会议论文集 S.7（1999 年）。

K.Ono et al.: "Formation and Migration of Helium Bubbles in Fe-16Cr-17Ni Austenitic Alloy at High Temperature"J.Nuclear Materials. 283/287. 210-214 (2000)

K.Ono等：“高温下Fe-16Cr-17Ni奥氏体合金中氦气泡的形成和迁移”J.核材料。

K.Ono et al.: "Formation and migration of helium bubbles in Fe-19Cr-17Ni austenitic alloy at high temperature"Journal of Nuclear Materials. 283/287. 210-214 (2000)

K.Ono等：“高温下Fe-19Cr-17Ni奥氏体合金中氦气泡的形成和迁移”核材料杂志。

K.Ono et al.: "Dynamical process of defect clustering in Ni under irradiation with low energy helium ions"Journal of Nuclear Materials. 271/272. 214-219 (1999)

K.Ono等人：“低能氦离子照射下镍中缺陷聚集的动态过程”核材料杂志。