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http://dx.doi.org/10.4150/KPMI.2019.26.4.299

Fabrication of Nb-Si-B Alloys Using the Pulverized Nb-T2 Alloy Powder  

Cho, Min-Ho (Department of Materials Science and Engineering, Kangwon National University)
Kim, Sung-Jun (Department of Materials Science and Engineering, Kangwon National University)
Kang, Hyun-Ji (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Kim, Young Do (Division of Materials Science and Engineering, Hanyang University)
Lee, Seong (Agency for Defence Development)
Suk, Myung Jin (Department of Materials Science and Engineering, Kangwon National University)
Publication Information
Journal of Powder Materials / v.26, no.4, 2019 , pp. 299-304 More about this Journal
Abstract
Nb-Si-B alloys with Nb-rich compositions are fabricated by spark plasma sintering for high-temperature structural applications. Three compositions are selected: 75 at% Nb (Nb0.7), 82 at% Nb (Nb1.5), and 88 at% Nb (Nb3), the atomic ratio of Si to B being 2. The microstructures of the prepared alloys are composed of Nb and $T_2$ phases. The $T_2$ phase is an intermetallic compound with a stoichiometry of $Nb_5Si_{3-x}B_x$ ($0{\leq}x{\leq}2$). In some previous studies, Nb-Si-B alloys have been prepared by spark plasma sintering (SPS) using Nb and $T_2$ powders (SPS 1). In the present work, the same alloys are prepared by the SPS process (SPS 2) using Nb powders and hypereutectic alloy powders with composition 67at%Nb-22at%Si-11at%B (Nb67). The Nb67 alloy powders comprise $T_2$ and eutectic ($T_2+Nb$) phases. The microstructures and hardness of the samples prepared in the present work have been compared with those previously reported; the samples prepared in this study exhibit finer and more uniform microstructures and higher hardness.
Keywords
Nb-Si-B alloy; Spark plasma sintering; $T_2$-phase; Pulverization; Hardness;
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