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A simple model for nitrogen-induced lattice expansion of γ'N and γ N phases in Fe–Cr–Ni alloys with different chromium contents
Philosophical Magazine Letters ( IF 1.2 ) Pub Date : 2020-07-09 , DOI: 10.1080/09500839.2020.1789234
H. L. Che 1 , M. K. Lei 1 , Marcel A. J. Somers 2
Affiliation  

ABSTRACT A recent publication on low-temperature nitriding of Fe–Cr–Ni alloys with various combinations of Cr and Ni contents showed experimentally the co-existence of γN and γ'N phases. An important result of the investigations was that with increasing Cr-content in the alloy, the lattice expansion induced by nitrogen dissolution in short-range ordered (SRO) γN is more pronounced than in the long-range ordered (LRO) γ'N phase. Eventually, for Cr contents beyond about 12 wt.%, the lattice expansions of the two co-existing phases become inseparable with X-ray diffraction investigation. The present contribution gives a simplified visualisation and prediction of the lattice expansion to explain this phenomenon. It is demonstrated that 25% of the N atoms trapped by Cr resides in LRO positions of γ'N-Me4N (Me = Fe,Cr,Ni).

中文翻译:

不同铬含量的 Fe-Cr-Ni 合金中 γ'N 和 γN 相氮诱导晶格膨胀的简单模型

摘要 最近发表的关于具有各种 Cr 和 Ni 含量组合的 Fe-Cr-Ni 合金低温渗氮的出版物通过实验表明 γN 和 γ'N 相共存。研究的一个重要结果是,随着合金中 Cr 含量的增加,氮溶解在短程有序 (SRO) γN 中引起的晶格膨胀比在长程有序 (LRO) γ'N 相中更明显. 最终,对于超过约 12 wt.% 的 Cr 含量,两个共存相的晶格膨胀变得与 X 射线衍射研究密不可分。目前的贡献给出了晶格膨胀的简化可视化和预测,以解释这种现象。结果表明,被 Cr 捕获的 N 原子中有 25% 位于 γ'N-Me4N (Me = Fe,Cr,Ni) 的 LRO 位置。
更新日期:2020-07-09
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