Department of Material Science and Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Microsc Microanal. 2013 Jun;19(3):665-75. doi: 10.1017/S1431927613000470. Epub 2013 May 3.
Nanostructure evolution during low temperature aging of three binary Fe-Cr alloys has been investigated by atom probe tomography. A new method based on radial distribution function (RDF) analysis to quantify the composition wavelength and amplitude of spinodal decomposition is proposed. Wavelengths estimated from RDF have a power-law type evolution and are in reasonable agreement with wavelengths estimated using other more conventional methods. The main advantages of the proposed method are the following: (1) Selecting a box size to generate the frequency diagram, which is known to generate bias in the evaluation of amplitude, is avoided. (2) The determination of amplitude is systematic and utilizes the wavelength evaluated first to subsequently evaluate the amplitude. (3) The RDF is capable of representing very subtle decomposition, which is not possible using frequency diagrams, and thus a proposed theoretical treatment of the experimental RDF creates the possibility to determine amplitude at very early stages of spinodal decomposition.
采用原子探针层析技术研究了三种二元 Fe-Cr 合金在低温时效过程中的纳米结构演变。提出了一种基于径向分布函数（RDF）分析来量化旋节分解的成分波长和幅度的新方法。从 RDF 估计的波长具有幂律类型的演变，并且与使用其他更传统的方法估计的波长相当一致。该方法的主要优点如下：（1）避免了选择生成频率图的盒大小，因为已知这种方法会在评估幅度时产生偏差。（2）幅度的确定是系统的，并且利用首先评估的波长来随后评估幅度。（3）RDF 能够表示非常细微的分解，这是使用频率图不可能的，因此对实验 RDF 的理论处理有可能在旋节分解的非常早期阶段确定幅度。
