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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Acknowledgements
Yongxin Jian thanks to Zhifu Huang, Jiandong Xing and Yimin Gao for their good advice. This work was supported by the National Natural Science Foundations of China (Grant No: 51371138 and 51571159), the Science and Technology Project of Guangdong Province in China (2015B090926009) and the Science and Technology Project of Guangzhou City in China (201604046009).
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The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
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Jian, Y., Huang, Z., Xing, J. et al. Effects of chromium on the morphology and mechanical properties of Fe2B intermetallic in Fe-3.0B alloy. J Mater Sci 53, 5329–5338 (2018). https://doi.org/10.1007/s10853-017-1936-2
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DOI: https://doi.org/10.1007/s10853-017-1936-2