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Effect of High Configuration Entropy and Rare Earth Addition on Boride Precipitation and Mechanical Properties of Multi-principal-Element Alloys

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Abstract

A series of multi-principal-element (MPE) alloys have been prepared by adding Ni, Mn, Al, Cu and Y into the reference CoCrFe-B alloy. The microstructure and mechanical properties of these MPE alloys have been investigated thoroughly. It is found that the addition of the elements can inhibit boride precipitation in the designed alloys and the solid solution strengthening effect induced by interstitial boron atoms is more significant than that by boride precipitation. The MPE alloys with the fcc phase as the main solid solution phase have a higher boron solubility and hence less boride precipitation, than those with the bcc phase as the main solid solution phase. The addition of yttrium can improve the boron solubility, decrease boride precipitation, control the boride morphology and, importantly, simultaneously improve the compressive strength and ductility of boron-containing MPE alloys.

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Acknowledgments

The authors thank the financial support from the National Natural Science Foundation of China (NSFC) under Grant No. 51271001 and Joint Fund of Iron and Steel Research by NSFC under Grant No. U1560105, the University Natural Science Research Project of Anhui Province of China under Grant No. KJ2014A029 and the Tribology Science Fund of State Key Laboratory of Tribology under Grant No. SKLTKF14B02.

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Zhang, H., Zhong, X.C., He, Y.Z. et al. Effect of High Configuration Entropy and Rare Earth Addition on Boride Precipitation and Mechanical Properties of Multi-principal-Element Alloys. J. of Materi Eng and Perform 26, 3750–3755 (2017). https://doi.org/10.1007/s11665-017-2831-3

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  • DOI: https://doi.org/10.1007/s11665-017-2831-3

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