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Pressureless Sintering of Mo-Si-B Alloys with Fe Additive

TitlePressureless Sintering of Mo-Si-B Alloys with Fe Additive
Publication TypeJournal Article
Year of Publication2017
AuthorsOuyang, GY, Ray, PK, Kramer, MJ, Akinc, M
JournalJournal of Materials Engineering and Performance
Date Published05
Type of ArticleArticle
ISBN Number1059-9495
Accession NumberWOS:000400278100049
KeywordsEDS, enthalpy, Intermetallics, liquid-phase sintering, Materials Science, Microstructure, Mo-Si-B, mo3si, molybdenum silicides, oxidation behavior, phase, pressureless, scale, SEM, sintering, system, ternary silicide borides, thermodynamic properties, transition metal silicides, transition-metal alloys, xrd

The sintering behavior of Mo-Si-B alloys with iron as a sintering additive was investigated. The addition of small amounts of Fe effectively enhanced the densification of Mo-Si-B at temperatures below 1900 A degrees C. The addition of 5 at.% Fe resulted in nearly full densification (97.0% of theoretical density) when sintered at 1750 A degrees C for 2 h, while the unmodified Mo-Si-B alloy could be densified to only 66.8% of its theoretical density under these conditions. Addition of 0.5 at.% Fe and 2 at.% Fe increased the degree of densification of Mo-Si-B by 15.4 and 17.0%, respectively, and led to nearly full densification at 1900 and 1850 A degrees C, respectively. Fe-Si-B eutectic liquid was formed at low temperatures and disappeared at high temperatures. We propose that the addition of Fe led to the formation of a transient liquid, facilitating liquid-phase sintering of the powder compacts.

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Short TitleJ. Mater. Eng. Perform.
Alternate JournalJ. Mater. Eng. Perform.