Mechanical properties of monocrystalline C11{sub b} MoSi{sub 2} with small aluminum additions

Journal Article · Sat Nov 15 04:00:00 EST 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00280-7· OSTI ID:554062

Peralta, P; Maloy, S A; Chu, F; Petrovic, J J; Mitchell, T E ^[1]

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1. Los Alamos National lab., NM (United States). Materials Science and Technology Div.

Molybdenum disilicide (MoSi{sub 2}) is a promising material for high temperature structural applications due to its high oxidation resistance, low density compared to nickel superalloys and high specific stiffness. These advantages are hindered by its poor low temperature fracture toughness, which in polycrystals deteriorates with increasing temperature due to the presence of glassy silica in the grain boundaries that produces intergranular fracture. Given that the effects of small Al additions on the mechanical properties of single crystals have not yet been explored, a study of the Vickers hardness for different crystallographic planes and directions has been carried out in monocrystalline Mo(Si,Al){sub 2} with the tetragonal Cl1{sub b} structure at room temperature and the results compared to measurements carried out in pure MoSi{sub 2} single crystals.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• OSTI ID: 554062
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ADDITIONS
FRACTURE PROPERTIES
HARDNESS
MECHANICAL PROPERTIES
MOLYBDENUM SILICIDES
MONOCRYSTALS
ORIENTATION
SOLUBILITY
TETRAGONAL LATTICES