On the α-α′ miscibility gap of Fe-Cr alloys

Experimental data on partial ordering and alpha' precipitation in Fe-Cr alloys and ferritic steels containing up to 15 at.% Cr are summarized. From this data and computer simulations employing the most advanced Fe-Cr cohesive models, the Fe-rich phase boundary of the alpha-alpha' miscibility gap is constructed. This boundary is critically compared with the standard (CALPHAD) Fe-Cr phase diagram in the same concentration range and a significant modification of the latter is proposed. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.