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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

基本信息

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

项目摘要

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.

用能量色散X射线能谱（EDS）分析了离子辐照合金的微观化学演变。在高温下用重离子辐照奥氏体钢，观察到合金元素的非平衡偏析或贫化。Ni和Si在空洞和晶界附近富集，而Cr、Mn和Mo在空洞和晶界处亏损。这是由这些元素的尺寸因素解释的。在热控材料中没有发现富镍相，它影响着辐照过程中的显微组织演变。奥氏体钢中的MC析出相在辐照过程中具有很强的稳定性，而Ni和Si在其表面的偏聚可使MC析出相发生改性，辐照合金的微观结构和微观化学演变强烈地依赖于注入离子的能量和种类。例如，400 HeV P^+离子辐照奥氏体钢在离子区深度附近产生磷化铁，这些沉淀抑制了辐照下空洞的形成;离子辐照沉淀硬化铁素体钢促进马氏体向奥氏体的转变，这在热时效中没有观察到;在离子辐照过程中，各种合金中都出现了非平衡偏析和沉淀。从本研究中提取了大量的数据来控制用高能离子辐照产生新材料。