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Processing, Microstructures, and Properties of Molybdenum Aluminosilicide
Author(s) -
Fu Ming,
Sekhar Jainagesh A.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02757.x
Subject(s) - molybdenum , materials science , microstructure , intermetallic , fracture toughness , vickers hardness test , ternary operation , metallurgy , analytical chemistry (journal) , chemistry , alloy , computer science , programming language , chromatography
A ternary intermetallic compound‐molybdenum aluminosilicide, Mo(Si 0.8 ,Al 0.2 ) 2 ‐was synthesized via micropyretic synthesis. The reaction constituents were elemental molybdenum, silicon, and aluminum powders in an atomic mixture of Mo + 1.6Si + 0.4Al. With the appropriate processing parameters, a highly dense product (up to 94% theoretical density) was obtained in a short time without applying external pressure. The synthesized product had a uniform microstructure, with a grain size of ∼16 μm. X‐ray diffractometry and energy‐dispersive spectroscopy confirmed the formation of Mo(Si 0.8 ,Al 0.2 ) 2 . In addition, small amounts of secondary phases (Mo 5 Si 3 and Al 2 O 3 ) were also identified in the product. The synthesized Mo(Si 0.8 ,Al 0.2 ) 2 was then subjected to various property measurements, including elastic moduli, Vickers hardness, indentation fracture toughness, and oxidation resistance. The measured property data, whenever possible, were compared to the corresponding values for MoSi 2 .