Microstructure evolution, crystallography, nanomechanical properties and wear-resistance of multi-component M2B in Fe–B alloy

• Published in: Journal of materials research Vol. 37; no. 8; pp. 1429 - 1439
• Main Authors: Song, Suocheng, Yi, Yanliang, Xing, Jiandong, Fu, Hanguang
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 28.04.2022; Springer Nature B.V
• Subjects: Applied and Technical Physics; Biomaterials; Borides; Chemistry and Materials Science; Chromium; Crystallography; Directional solidification; Dislocations; Evolution; Inorganic Chemistry; Iron; Materials Engineering; Materials research; Materials Science; Microstructure; Molybdenum; Nanotechnology; Stiffness; Stoichiometry; Wear resistance; B; Wear-resistance; Multi-component M; Crystallography; Nanoindentation; Fe–B alloy
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/s43578-022-00543-z

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 M 2 B have been systematically studied. The results show that the boride grows in the sequence of Mo-rich → Fe-rich → Cr-rich M 2 B. The Mo-rich M 2 B has the body centered tetragonal (bct) structure with stoichiometry of Fe 0.72 Cr 0.27 Mo 0.80 (B,C), the Fe-rich M 2 B possesses the bct structure with stoichiometry of Fe 1.59 Cr 0.38 Mo 0.08 (B,C), while the Cr-rich M 2 B owns the body centered orthorhombic (bco) structure with stoichiometry of Fe 1.48 Cr 0.50 Mo 0.02 (B,C). Moreover, the Mo addition can facilitate more dislocations in the M 2 B compared to the Cr addition. Thus, the Mo-rich M 2 B has the best stiffness and toughness, followed by the Cr-rich M 2 B and then the Fe-rich M 2 B. Additionally, the Mo-rich and Cr-rich M 2 B can possess higher wear-resistance relative to the Fe-rich M 2 B. Graphical abstract