Temperature dependent dispersoid stability in ion-irradiated ferritic-martensitic dual-phase oxide-dispersion-strengthened alloy: Coherent interfaces vs. incoherent interfaces
Temperature dependent dispersoid stability in ion-irradiated ferritic-martensitic dual-phase oxide-dispersion-strengthened alloy: Coherent interfaces vs. incoherent interfaces
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DOI：
10.1016/j.actamat.2016.05.042
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发表时间：
2016-09-01
期刊：
影响因子：
9.4
通讯作者：
Shao, Lin
中科院分区：
文献类型：
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作者：
Chen, Tianyi;Gigax, Jonathan G.;Shao, Lin
在这项研究中，12铬铁素体-马氏体氧化物弥散强化（ODS）合金的微观结构进行了研究之前和之后的Fe离子辐照高达200峰位移每原子（dpa）。辐照温度范围为325至625摄氏度。辐照前，基体中既有相干弥散相，也有非相干弥散相。响应于辐照，铁素体和回火马氏体相中的弥散体的平均尺寸改变到随辐照温度增加的平衡值。辐射下的分散体的演变解释由热辐射驱动的收缩和热扩散驱动的增长之间的竞争，与界面的一致性影响的生长机制。然而，每种相干类型在辐照下表现出不同的演化行为。无论其初始尺寸如何，共格分散体在每个测试温度下都朝着平衡尺寸变化。另一方面，不相干的弥散体在较低的测试温度下被破坏，但在较高的温度下尺寸收缩时存活。这种行为上的差异可以通过与非相干分散体相比，相干分散体的较低界面能来解释。这项研究揭示了界面结构在辐照下保持分散体完整性的作用。(C)2016由Elsevier Ltd代表Acta Materialia Inc.发布。
In this study, the microstructure of a 12Cr ferritic-martensitic oxide-dispersion-strengthened (ODS) alloy is studied before and after Fe ion irradiation up to 200 peak displacements per atom (dpa). Irradiation temperature ranges from 325 to 625 degrees C. Before irradiation, both coherent and incoherent dispersoids exist in the matrix. In response to irradiation, the mean sizes of dispersoids in both the ferrite and tempered martensite phases change to equilibrium values that increase with irradiation temperature. The evolution of dispersoids under irradiation is explained by a competition between athermal-radiation-driven shrinkage and thermal-diffusion-driven growth, with interface coherency affecting the growth mechanism. However, each coherency type exhibits different evolution behavior under irradiation. Coherent dispersoids, regardless of their initial size, change toward an equilibrium size at each temperature tested. On the other hand, incoherent dispersoids are destroyed at lower test temperatures but survive while shrinking in size at higher temperatures. This difference in behavior can be explained by the lower interfacial energy of coherent dispersoids in comparison with incoherent dispersoids. This study sheds light on the roles of interface configurations in maintaining dispersoid integrity under irradiation. (C) 2016 Published by Elsevier Ltd on behalf of Acta Materialia Inc.