Fault-induced polytypism in (Cr, Fe)₂B

Boride Formation Induced by pcBN Tool Wear in Friction-Stir-Welded Stainless Steels

“…[35] However, (Fe, Cr) 2 B is less stable than (Cr, Fe) 2 B at high temperature due to the lower melting temperature of (Fe, Cr) 2 B. This would cause the substitution of Cr atoms for Fe atoms in the (Fe, Cr) 2 B phase to lower the free energy of the system.…”

“…These crystallographic features are in good agreement with a previous study. [35] This evidence suggests that the boride is formed through the BN fi (Fe, Cr) 2 B fi (Cr, Fe) 2 B phase transformation during FSW.…”

“…As the Cr content in the (Fe, Cr) 2 B exceeds the solubility limit, (Fe, Cr) 2 B begins to transform into the (Cr, Fe) 2 B phase by atomic shifts of B on {110} crystallographic planes. [35] It has been reported that the (Fe, Cr) 2 B fi (Cr, Fe) 2 B phase transformation takes place through the generation of stacking faults in (Cr, Fe) 2 B along the [100] crystallographic direction. [35] The present study also found many borides with a number of stacking faults.…”

“…[35] It has been reported that the (Fe, Cr) 2 B fi (Cr, Fe) 2 B phase transformation takes place through the generation of stacking faults in (Cr, Fe) 2 B along the [100] crystallographic direction. [35] The present study also found many borides with a number of stacking faults. Figure 12 shows an example of Cr 2 B having staking faults.…”

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

“…Unlike M 3 B 2 and M 5 B 3 phases, M 2 B phase is always heavily faulted [43,44] . M 2 B phase has dual structural character, namely the C16 structure (Strukturbericht notation C16, space group I4/mcm) with the lattice parameter: a=0.52 nm, c=0.43 nm and C b structure (Strukturbericht notation C b , space group Fddd) with the lattice parameter: a=1.47 nm, b=0.74 nm, c=0.43 nm [44,45] .…”