On the composition and structure of nanoprecipitates in irradiated pressure vessel steels
On the composition and structure of nanoprecipitates in irradiated pressure vessel steels
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辐照压力容器钢纳米析出物的成分和结构
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
B. Wirth
中科院分区：
文献类型：
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作者：
G. Odette;C. L. Liu;B. Wirth
纳米级富铜沉淀(CRP)被广泛认为是辐照反应堆压力容器(RPV)钢的主要硬化特征，导致严重的脆化。然而，这一观点最近受到了对原子探针场离子显微镜(APFIM)测量的解释的挑战，这些测量将主要的纳米特征描述为稀溶质大气(DSA)。这些不同观点的实际影响是非常显著的。这项工作将CRP和DSA描述与各种相关数据进行了比较和对比。力学性能趋势以及小角中子散射(SANS)和场发射扫描电子显微镜(FEGSTEM)测量支持CRPS的存在。CRP也符合热力学和动力学的基本定律。然而，标准理论不能提供完全理解纳米特征所需的原子水平分辨率。因此，我们采用了一种新的格子蒙特卡罗(LMC)原子方法来模拟CRPS的复杂化学结构。LMC方法将SANS/FEGSTEM和APFIM数据统一在一个基础良好的物理框架内。
Nanoscale Cu rich precipitates (CRPs) are widely believed to be the dominant hardening feature resulting in severe embrittlement in irradiated reactor pressure vessel (RPV) steels. However, this view has recently been challenged by interpretations of atom probe field ion microscopy (APFIM) measurements that describe the dominant nanofeatures as dilute solute atmospheres (DSAs). The practical impact of these differing views is very significant. This work compares and contrasts the CRP versus DSA descriptions to a wide variety of pertinent data. Mechanical property trends as well as small angle neutron scattering (SANS) and field emission scanning transmission electron microscopy (FEGSTEM) measurements support the presence of CRPs. CRPs are also consistent with the fundamental thermodynamic and kinetic laws. However, standard theory cannot provide the atomic level resolution needed to fully understand the nanofeatures. Therefore, a new Lattice Monte Carlo (LMC) atomistic method is used to simulate the complex chemical structures of the CRPs. The LMC method unifies the SANS/FEGSTEM and APFIM data within a well founded physical framework.