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

Journal Article · Mon Mar 01 04:00:00 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), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24:3; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

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