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Regulating the Microstructure of Sm2Fe17ZrNb0.4Cu0.2B0.2 Amorphous Alloys by Two-Step Annealed

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Abstract

The impact of pre-annealing temperature on the crystallization and nitridation of amorphous will be investigated. Sm2Fe17ZrNb0.4Cu0.2B0.2 amorphous alloy ribbons were prepared by melt spinning at the speed of 40 m/s, and the ribbons were two-step annealed after nitridation. The phase composition and microstructure of the material were characterized, glass-forming ability (GFA) was analyzed and the nitrogen content of ribbons were detected. The results indicate that pre-annealing treatment is effective in inhibiting the rapid precipitation of the α-Fe phase. The equiaxed grains with uniform size were obtained by two-step annealed, of which the pre-annealing treatment is at 773 K for 90 minutes and crystallization treatment is at 873 K for 10 minutes. The initial crystallization temperature is reduced from 908  K to 793 K. The nitrogen content is ~ 2.68 pct after two-step annealing, which increases ~ 5.6 pct than that of the direct crystallization (~ 2.53 pct). Therefore, pre-annealing treatment at 773 K for 90 minutes can achieve microstructural reconstruction of Sm2Fe17ZrNb0.4Cu0.2B0.2, the reduced crystallization temperature inhibits the overflow of nitrogen atoms and improves the nitriding efficiency.

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Acknowledgments

This work was supported by Colleges and Universities in Hebei Province Science and Technology Research Project (No. QN2021115), Natural Science Foundation of Hebei Province (No. E2021209146) and The Central Government Guides the Local Science and Technology Development Fund Project (Free Exploration Basic Research No. 226Z1006G). We would like to thank Editage (www.editage.cn) for English language editing.

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  1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063210, P.R. China

    Wanting Wang, Shuhuan Wang, Kun Liu & Yikun Zhang

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  1. Wanting Wang
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Correspondence to Kun Liu.

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Wang, W., Wang, S., Liu, K. et al. Regulating the Microstructure of Sm2Fe17ZrNb0.4Cu0.2B0.2 Amorphous Alloys by Two-Step Annealed. Metall Mater Trans A 54, 605–614 (2023). https://doi.org/10.1007/s11661-022-06905-w

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