首页|Intermetallic compounds of the Cr-Mn system investigated using in situ powder neutron diffraction: The reported order-disorder transformation of the ? phase elucidated
Intermetallic compounds of the Cr-Mn system investigated using in situ powder neutron diffraction: The reported order-disorder transformation of the ? phase elucidated
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NSTL
Elsevier
Cr-Mn system is very important for many applications. In the present work, the reported intermetallic compounds have been studied using in situ high temperature neutron powder diffraction. For the first time, site occupancies in a sigma phase are obtained as a function of temperature by Rietveld analysis. They are compared with calculated data obtained from DFT. The previously reported order-disorder transition in the sigma phase around 1000 degrees C is shown to be in fact a congruent phase transformation to the bcc Cr-Mn solid solution. This solid solution is probably continuous between pure Cr and delta-Mn. The second reported intermetallic alpha' phase (Cr2Mn3) phase is shown to be in fact a ternary nitride of the Cr-Mn-N system that should not appear in the binary phase diagram. The present work clarifies and explains all the features of the previous literature on this system and brings major revisions to the phase diagram. General conclusions are drawn concerning mistakes that can be done in the evaluations of phase diagrams.
NSTL
Elsevier
