Structural and magnetic transition in stainless steel Fe-21Cr-6Ni-9Mn up to 250 GPa

• Published in: Chinese physics B Vol. 24; no. 6; pp. 451 - 456
• Main Author: 柳雷 侯琪玥 张毅 敬秋民 王志刚 毕延 徐济安 李晓东 李延春 刘景
• Format: Journal Article
• Language: English
• Published: 01.06.2015
• Subjects: Anisotropy; Austenitic stainless steels; Chromium; Close packed lattices; Collapse; Density; HCP; Hexagonal cells; Nickel; Stainless steels; x射线衍射技术; 不锈钢; 压缩行为; 密排六方结构; 晶体结构; 重量百分比; 非磁性
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/24/6/066103

Stainless steel Fe-21Cr-6Ni-9Mn （SS 21-6-9）, with ~21% Cr, ,~6% Ni, and ~ 9% Mn in weight percentage, has wide applications in extensive fields. In the present study, SS 21-6-9 is compressed up to 250 GPa, and its crystal structures and compressive behaviors are investigated simultaneously using the synchrotron angle-dispersive x-ray diffraction technique. The SS 21-6-9 undergoes a structural phase transition from fcc to hcp structure at ~ 12.8 GPa with neglectable volume collapse within the determination error under the quasi-hydrostatic environment. The hcp structure remains stable up to the highest pressure of 250 GPa in the present experiments. The antiferromagnetic-to-nonmagnetic state transition of hcp SS 21-6-9 with the changes of inconspicuous density and structure, is discovered at ~50 GPa, and revealed by the significant change in c/a ratio. The hcp SS-21-6-9 is compressive anisotropic： it is more compressive in the c-axis direction than in the a-axis direction. Both the equations of states （EOSs） of fcc and hcp SS 21-6-9, which are in accordance with those of fcc and hcp pure irons respectively, are also presented. Furthermore, the c/a ratio of hcp SS 21-6-9 at infinite compression, R∞, is consistent with the values of pure iron and Fe-10Ni alloy.