Strength, fracture, and fatigue behavior of advanced high-temperature intermetallics reinforced with ductile phases

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02656628· OSTI ID:6204114

Soboyejo, W O ^[1]; Venkateswara Rao, K T; Ritchie, R O ^[2]; Sastry, S M.L. ^[3]

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1. Ohio State Univ., Columbus (United States)
2. Univ. of California, Berkeley (United States)
3. Washington Univ., St. Louis, MO (United States)

The results of recent studies on the fatigue and fracture behavior of extruded Ti-48Al + 20 vol pct TiNb and hot-isostatically pressed ('hipped') MoSi[sub 2] + 20 vol pct Nb are presented (compositions in atomic percent unless stated otherwise). The effects of ductile phase reinforcement of Ti-48Al and MoSi[sub 2] on the micromechanisms of fracture under monotonic and cyclic loading are elucidated. Micromechanics models are applied to the prediction of crack-tip shielding components, and the effects of temperature on tensile/compressive/flexure strengths are discussed. Ductile phase toughening under monotonic loading conditions is shown to be associated with lower fatigue crack growth resistance. The lower fatigue resistance is attributed to the absence of crack-tip shielding, higher crack opening displacements, and the effects of inelastic strains that are developed in ductile phase-reinforced composites under cyclic loading conditions.

• OSTI ID: 6204114
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 24:3; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
COMPOSITE MATERIALS
MOLYBDENUM SILICIDES
NIOBIUM
NIOBIUM ALLOYS
TITANIUM BASE ALLOYS
COMPRESSION STRENGTH
CRACK PROPAGATION
DUCTILITY
EXPERIMENTAL DATA
FATIGUE
FLEXURAL STRENGTH
FRACTURE PROPERTIES
HOT WORKING
INTERMETALLIC COMPOUNDS
MATHEMATICAL MODELS
PHASE STUDIES
REINFORCED MATERIALS
SAMPLE PREPARATION
TENSILE PROPERTIES
ALLOYS
DATA
ELEMENTS
FABRICATION
INFORMATION
MATERIALS
MATERIALS WORKING
METALS
MOLYBDENUM COMPOUNDS
NUMERICAL DATA
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON COMPOUNDS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360603* - Materials- Properties