Magnetically induced immiscibility in the Ising model of FeCr stainless steel.
Magnetically induced immiscibility in the Ising model of FeCr stainless steel.
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FeCr 不锈钢 Ising 模型中的磁致不溶性。
DOI：
10.1103/physrevlett.97.015502
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发表时间：
2006
影响因子：
8.6
通讯作者：
Graeme Ackland
中科院分区：
文献类型：
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作者：
Graeme Ackland
铁铬合金系统有一个无法解释的异常：虽然有一个广泛的可溶解性差距，但似乎有利于铬溶解在铁中。这与从头计算是一致的，但没有更简单的物理直观的图片已经提出。在这里，它示出的伊辛模型，基于体心立方晶格与反铁磁和铁磁物种，具有潜在的表现出类似的行为，与反铁磁物种的非相邻站点上的溶解度所产生的斜向可扩展性间隙。正确再现了不锈钢的基本特性（高Cr溶解度和表面偏析）。在某些条件下，磁化强度随温度而增加。由于混合磁性和偏析驱动的正dM/dT的平衡可磁化性间隙是bcc伊辛模型本身的基本特征，而不仅仅是FeCr。
The iron-chromium alloy system has an unexplained anomaly: although there is a broad miscibility gap it appears to be favorable for chromium to dissolve in iron. This is consistent with ab initio calculation, but no simpler physically intuitive picture has been presented. Here it is shown that the Ising model, based on the bcc lattice with antiferromagnetic and ferromagnetic species, has the potential to exhibit similar behavior, with a skew miscibility gap arising from the solubility of antiferromagnetic species on nonadjacent sites. Essential characteristics of stainless steel (high Cr solubility and surface segregation) are correctly reproduced. Under some conditions, magnetization increases with temperature. The equilibrium miscibility gap due to mixed magnetism and segregation-driven positive dM/dT are fundamental features of the bcc Ising model itself, not just FeCr.