Abstract Cu precipitation in Fe is technologically and scientifically important. Atom probe tomography (APT) often reports high Fe in copper rich precipitates (CRPs). Some argue that this is an APT artifact. Here, Fe-0.80 at. % Cu (Fe-Cu) and Fe-0.78 at. % Cu-1.05 at.% Mn (Fe-Cu-Mn) alloys were characterized by several microanalytical techniques, following thermal aging and neutron irradiation that produced a high density of nanoscale CRPs. The CRP number densities, mole fractions and sizes characterized by different techniques are reasonably consistent, but not the compositions in the case of APT. A new small-angle neutron scattering method was used, involving measuring the temperature dependence of magnetic scattering (T-SANS), which proved that the CRPs are non-magnetic at ambient temperature. Nuclear scattering mass balance constraints show that CRPs do not contain a significant amount of Fe. Positron annihilation spectroscopy and SANS magnetic-to-nuclear scattering ratio measurements are also consistent with very small amounts, if any, of Fe in the CRPs.

中文翻译：

---

热时效和中子辐照 Fe-Cu 和 Fe-Cu-Mn 模型合金中析出物的多技术表征：原子探针断层扫描重建的意义

摘要 Fe中的Cu沉淀在技术和科学上都具有重要意义。原子探针断层扫描 (APT) 经常报告富铜沉淀物 (CRP) 中的高 Fe。有人认为这是 APT 神器。在这里，Fe-0.80 在。% Cu (Fe-Cu) 和 Fe-0.78 at。% Cu-1.05 at.% Mn (Fe-Cu-Mn) 合金在经过热老化和中子辐照后产生高密度纳米级 CRP 后，通过几种微量分析技术进行表征。由不同技术表征的 CRP 数密度、摩尔分数和尺寸相当一致，但在 APT 的情况下组成不同。使用了一种新的小角度中子散射方法，包括测量磁散射的温度依赖性 (T-SANS)，这证明 CRP 在环境温度下是非磁性的。核散射质量平衡约束表明 CRP 不含大量 Fe。正电子湮没光谱和 SANS 磁核散射比测量也与 CRP 中极少量的 Fe（如果有的话）一致。