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Published in: Journal of Materials Science 7/2018

02-01-2018 | Metals

Effects of chromium on the morphology and mechanical properties of Fe2B intermetallic in Fe-3.0B alloy

Authors: Yongxin Jian, Zhifu Huang, Jiandong Xing, Yimin Gao

Published in: Journal of Materials Science | Issue 7/2018

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Abstract

In this work, the effects of chromium addition on the morphology and mechanical properties of Fe2B in Fe-3.0B alloy have been systematically investigated by a combination of experimental observations and the first-principles calculations. The results indicate that, with chromium addition in Fe-3.0B alloy ranging from 0 to 2.5 wt%, the average grain size of the boride firstly decreases and then increases slightly, mainly attributed to the volume fraction of coarse block boride. The nanoindentation hardness H of the boride remains almost constant while the elastic modulus E r firstly drops and then rises. Accordingly, the H/E r of the boride achieves a peak value at the chromium addition of 2.0 wt%, where the highest toughness is obtained. High-resolution transmission electron microscopy (HRTEM) observation demonstrates that the lattice of borides evolves from tetragonal to orthorhombic ((Fe, Cr)2B) after chromium addition, in good accordance with the calculation results. During the lattice evolution, a shrinkage of B–B bond along [002] direction is simultaneously revealed. The inherently weak B–B bond can be strengthened, which improves fracture toughness of Fe2B.

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Metadata
Title
Effects of chromium on the morphology and mechanical properties of Fe2B intermetallic in Fe-3.0B alloy
Authors
Yongxin Jian
Zhifu Huang
Jiandong Xing
Yimin Gao
Publication date
02-01-2018
Publisher
Springer US
Published in
Journal of Materials Science / Issue 7/2018
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-1936-2

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