Microchemical Evolution in Alloys by Ion Irradiation and Fundamental Research for Creation of New Materials

离子辐照合金中的微化学演化和新材料创造的基础研究

• 批准号: 60420053
• 负责人: ISHINO Shiori
• 金额: $ 10.5万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60420053/
• 关键词: Ion Irradiation; Creation of New Materials; Radiation-enhanced segregation; Radiation-modified Phase Transformation; Radiation-enhanced Precipitation; Voids; 時効効果; 析出物; ミクロ組成変化

Microchemical evolution in ion-irradiated alloys is analyzed by energy dispersive X-ray spectroscopy (EDS). Non-equilibrium segregation or depletion of alloying elements is observed in austenitic steels irradiated with heavy ions at elevated temperatures. Ni and Si are enriched around cavities and grain boundaries, while Cr, Mn and Mo are depleted there. These are explained by size factors of these elements. Ni-rich phases which are not seen in thermally controled material affect microstructural evolution during irradiation. MC precipitates in austenitic steels have strong stability during irradiation, while segregation of Ni and Si to their surface can modify the precipitates.Microstructural and microchemical evolution in ion-irradiated alloys strongly depends on both energy and species of injected ions. For example, 400 HeV P^+ ion irradiation to austenitic steels produces iron-phosphide around the depth of ion range, and these precipitates supress void formation under irradiation.Ion irradiation to precipitation-hardened ferritic steel promotes transition of martensitic phase to austenitic phase, which is not observed by thermal aging.Non-equiliburium segregation and precipitation are found in various kinds of alloys during ion irradiation. Enormous data to control the creation of new materials by irradiation with energetic ions have been extracted from the present study.

通过能量色散 X 射线光谱 (EDS) 分析离子辐照合金中的微量化学演化。在高温下用重离子辐照的奥氏体钢中观察到合金元素的非平衡偏析或耗尽。 Ni和Si在空腔和晶界周围富集，而Cr、Mn和Mo则在这些地方贫化。这些可以通过这些元素的尺寸因子来解释。在热控材料中看不到的富镍相会影响辐照期间的微观结构演变。奥氏体钢中的 MC 析出物在辐照过程中具有很强的稳定性，而 Ni 和 Si 偏析到其表面可以改变析出物。离子辐照合金的微观结构和微观化学演化强烈依赖于注入离子的能量和种类。例如，对奥氏体钢进行 400 HeV P^+ 离子辐照，会在离子范围深度附近产生磷化铁，这些沉淀物会抑制辐照下空洞的形成。对沉淀硬化铁素体钢进行离子辐照会促进马氏体相向奥氏体相转变，热老化观察不到这一现象。各种合金在离子辐照过程中均发现非平衡偏析和析出。从本研究中提取了大量数据来控制通过高能离子辐照产生新材料。

项目成果

N. SEKIMURA.: "Inhomogeneous Microstructural Evolution in Austenitic SteelsDuring Heavy Ion Irradiation" Journal of Nuclear Materials. 155-157. (1988)

N. SEKIMURA.：“重离子辐照期间奥氏体钢的不均匀微观结构演化”核材料杂志。

G.E.Lucas;T.Zama;S.Ishino: Journal of Nuclear Materials. 141-143. 799-803 (1986)

G.E.卢卡斯；T.Zama；S.Ishino：核材料杂志。

J.of Nuclear Materials. 133&134. (1985)

核材料杂志。

N.Sekimura;T.Zama;H.Kawanishi;S.Ishino: Journal of Nuclear Materials. 141-143. 771-775 (1986)

N.Sekimura；T.Zama；H.​​Kawanishi；S.Ishino：核材料杂志。

S.Ishino;N.Sekimura;K.Hirooka;T.Muroga: Journal of Nuclear Materials. 141-143. 776-780 (1986)

S.Ishino；N.Sekimura；K.Hirooka；T.Muroga：核材料杂志。