Ordered sigma-type phase in the Ising model of Fe-Cr stainless steel
Ordered sigma-type phase in the Ising model of Fe-Cr stainless steel
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DOI：
10.1103/physrevb.79.094202
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发表时间：
2009-03-01
影响因子：
3.7
通讯作者：
Ackland, G. J.
中科院分区：
文献类型：
--
作者：
Ackland, G. J.
提出了一种描述有序相在高温下析出的基于晶格的Ising模型。它基于混合铁磁性和反铁磁性的Ising模型，对铁铁相图进行了定性描述。除了自旋和种类之外，还有第三个指标标记沉淀相，并用于产生其附加熵。因此，FM-AFM Ising模型适用于在高温下产生sigma型相的沉淀，正如在FeCr中观察到的那样，其形式适合于动力学蒙特卡罗模拟。此外，还描述了在材料（如FeCr）的混相间隙中观察到的异常不对称，以及高cr含量钢的有限低温溶解度和不锈钢性能的开始。
A lattice-based Ising model is presented which describes precipitation of an ordered phase at high temperature. It is based around the Ising model of mixed ferromagnetism (FM) and antiferromagnetism (AFM), which gives a qualitative description of the FeCr phase diagram. In addition to spin and species, a third index labels the precipitate phase and serves to produce its additional entropy. Thus the FM-AFM Ising model is adapted to produce precipitation of a sigma-type phase at high temperature, as observed in FeCr, in a form suitable for kinetic Monte Carlo simulations. In addition, the anomalous asymmetry observed in the miscibility gap of materials such as FeCr is also described, as is the finite low-temperature solubility and the onset of the stainless property for high-Cr content steel.