论文标题
转化的动力学，Fe-Cr合金中亚稳态可见性差距的边界以及在858 K的铁中的Cr溶解度极限
Kinetics of transformation, border of metastable miscibility gap in Fe-Cr alloy and limit of Cr solubility in iron at 858 K
论文作者
论文摘要
该研究的目的是确定在858 K处铁的富含富富富的链边界的位置和铁中Cr的Cr的溶解度极限。为此，FE73.7CR26.3合金在858 k时等于858 k，在真空中，在8144小时和8144小时的录音均记录了录制的室温，均已录制了录制的室内温度。三个光谱参数。平均超精细场，<b>，平均异构体移位，<is>，以及原子构型的概率，在探头Fe原子的两壳附近，p（0,0）中没有Cr原子，P（0,0）提供了证据，证明转换过程发生在两个阶段。所有三个参数都可以用Johnson-Mehl-Avrami-Kolmogorov方程来很好地描述，从而产生动力学参数。与相位分解相关的第一阶段的进行速度比第二阶段快得多，第二阶段与α-到sigma相变相关。 MMG位置的最可靠估计和Cr溶解度极限的值的估计是从退火时间依赖性获得的，即前者的24.5 at。％Cr，而后者为20.3 at。％Cr。这些数字与最近与FE-CR系统有关的相图的比较。
The study was aimed at determination of the position of the Fe-rich border of the metastable miscibility gap (MMG) and of the solubility limit of Cr in iron at 858 K. Towards this end a Fe73.7Cr26.3 alloy was isothermally annealed at 858 K in vacuum up to 8144 hours and Mössbauer spectra were recorded at room temperature after every step of the annealing. Three spectral parameters viz. the average hyperfine field, <B>, the average isomer shift, <IS>, and the probability of the atomic configuration with no Cr atoms in the two-shell vicinity of the probe Fe atoms, P(0,0), gave evidence that the transformation process takes place in two stages. All three parameters could have been well described in terms of the Johnson-Mehl-Avrami-Kolmogorov equation, yielding kinetics parameters. The first stage, associated with the phase decomposition, proceeded much faster than the second stage, associated with the alpha-to-sigma phase transformation. The most reliable estimation of the position of the MMG and that of the value of the Cr solubility limit was obtained from the annealing time dependence of <B>, namely 24.5 at.% Cr for the former and 20.3 at.% Cr for the latter. A comparison of these figures with the recent phase diagrams pertinent to Fe-Cr system was done.
