To investigate the basic characteristics of multi-component boride in Fe–B alloy, the samples were prepared by directional solidification, and then the microstructural evolution, crystallography, nanomechanical properties and wear-resistance of multi-component M₂B have been systematically studied. The results show that the boride grows in the sequence of Mo-rich → Fe-rich → Cr-rich M₂B. The Mo-rich M₂B has the body centered tetragonal (bct) structure with stoichiometry of Fe_0.72Cr_0.27Mo_0.80(B,C), the Fe-rich M₂B possesses the bct structure with stoichiometry of Fe_1.59Cr_0.38Mo_0.08(B,C), while the Cr-rich M₂B owns the body centered orthorhombic (bco) structure with stoichiometry of Fe_1.48Cr_0.50Mo_0.02(B,C). Moreover, the Mo addition can facilitate more dislocations in the M₂B compared to the Cr addition. Thus, the Mo-rich M₂B has the best stiffness and toughness, followed by the Cr-rich M₂B and then the Fe-rich M₂B. Additionally, the Mo-rich and Cr-rich M₂B can possess higher wear-resistance relative to the Fe-rich M₂B.

Link：https://link.springer.com/article/10.1557/s43578-022-00543-z