Defect-flow-induced heterogeneous dislocation formation and solute redistribution near a grain boundary in austenitic stainless steel under electron irradiation
Defect-flow-induced heterogeneous dislocation formation and solute redistribution near a grain boundary in austenitic stainless steel under electron irradiation
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电子辐照下奥氏体不锈钢中缺陷流诱导的异质位错形成和晶界附近的溶质重新分布
DOI：
10.1016/s0022-3115(98)00778-8
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Heishichiro Takahashi
中科院分区：
文献类型：
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作者：
Seiichi Watanabe;N. Sakaguchi;S. Mochizuki;Heishichiro Takahashi
研究了Fe-Cr-Ni合金在辐照条件下晶界的辐射诱导偏析（RIS），并考虑了位错环和位错网的演化。利用日本北海道大学的高压电子显微镜（1000 kV）对典型奥氏体Fe-Cr-Ni合金进行了电子辐照研究。通过求解晶界汇附近溶质和缺陷浓度的耦合速率方程进行了理论分析。定性地解释了理论预测的实验溶质再分配剖面。在电子辐照下的原位观察期间，还观察到在晶界附近的无位错区（DLFZ）的形成。偏聚区宽度和DLFZ区宽度随温度的变化趋势相似。因此，建议RIS和DLFZ的形成应解释在辐照下的缺陷流动诱导的现象。RIS和晶界附近的这种异质缺陷聚集之间的相互关系也基本上澄清。
The authors investigated radiation-induced segregation (RIS) at a grain boundary in an Fe–Cr–Ni alloy under irradiation taking account of the evolution of faulted dislocation loops and network dislocations. Electron irradiation with a high voltage electron microscope (1000 kV) at Hokkaido University, Japan, was performed to study radiation-induced solute segregation and point defect flow in a typical austenitic Fe–Cr–Ni alloy. The theoretical analysis was conducted by solving the coupled rate equations for solute and defect concentrations near a grain boundary sink. The experimental solute redistribution profiles predicted by the theory were explained qualitatively. The formation of dislocation free zone (DLFZ) in the vicinity of a grain boundary was also observed during in situ observation under electron irradiation. The temperature dependence of the segregation width and that of DLFZ zone width show similar trends. It is thus suggested that RIS and DLFZ formation should be explained by the defect-flow-induced phenomenon under irradiation. The inter-relationship between RIS and such heterogeneous defect clustering near a grain boundary was also clarified substantially.