Deformation and fracture of the PWA 1472 superalloy single crystal

The deformation and fracture of a PWA 1472 single crystal oriented in a soft orientation were studied by analyzing the evolution of slip bands and detailed fractography of tensile specimens tested at low (10 −4/s) and high (1.0/s) strain rates at room temperature. The results of this study indicated...

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Bibliographic Details
Published inActa materialia Vol. 48; no. 2; pp. 469 - 479
Main Authors Ebrahimi, F., Yanevich, J., Deluca, D.P.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 24.01.2000
Elsevier Science
Subjects
ANISOTROPY
Applied sciences
Condensed matter: structure, mechanical and thermal properties
DEFORMATION
Deformation bands
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
FRACTOGRAPHY
Fracture
FRACTURE PROPERTIES
HEAT RESISTING ALLOYS
MATERIALS SCIENCE
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metals. Metallurgy
MONOCRYSTALS
Physics
Single crystal
SLIP
STRAIN RATE
STRAINS
Superalloy
Superalloy
Deformation bands
Fracture
Single crystal
Strain rate sensitivity
Monocrystals
Fracture mechanics
Ruptures
Mechanical properties
Slip band
Plastic deformation
Experimental study
Superalloys
Fractography
Strain rate
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Summary:The deformation and fracture of a PWA 1472 single crystal oriented in a soft orientation were studied by analyzing the evolution of slip bands and detailed fractography of tensile specimens tested at low (10 −4/s) and high (1.0/s) strain rates at room temperature. The results of this study indicated that the slip did not start on the system with the highest Schmid factor. This yielding anisotropy has been attributed to the deformation of the γ′-Ni 3Al precipitates. The plastic deformation was heterogeneous and occurred by the propagation of a Lüders band. Cleavage fracture occurred along the kink bands within a coarse shear band that developed after the activation of the secondary slip system. An increase in the strain rate did not affect the yield strength significantly, but it enhanced the deformation localization, and hence, decreased the ductility and increased the percentage of the cleavage facets. The effect of strain rate is discussed in terms of cross-slip processes.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(99)00355-9