Vitos L, Korzhavyi P A, Johansson B
Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Phys Rev Lett. 2006 Mar 24;96(11):117210. doi: 10.1103/PhysRevLett.96.117210.
The surprisingly low magnetic transition temperatures in austenitic stainless steels indicate that in these Fe-based alloys magnetic disorder might be present at room temperature. Using a first-principles approach, we have obtained a theoretical description of the stacking fault energy in Fe(100-c-n)Cr(c)Ni(n) alloys as a function of composition and temperature. Comparison of our results with experimental databases provides a strong evidence for large magnetic fluctuations in these materials. We demonstrate that the effects of alloying additions on the structural properties of steels contain a dominant magnetic contribution, which stabilizes the most common austenitic steels at normal service conditions.
奥氏体不锈钢中令人惊讶的低磁转变温度表明，在这些铁基合金中，室温下可能存在磁无序。我们采用第一性原理方法，得到了Fe(100 - c - n)Cr(c)Ni(n)合金中堆垛层错能随成分和温度变化的理论描述。将我们的结果与实验数据库进行比较，为这些材料中存在大的磁涨落提供了有力证据。我们证明，合金元素对钢的结构性能的影响包含一个主要的磁贡献，这使得最常见的奥氏体钢在正常使用条件下得以稳定。
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