Plastic deformation and fracture behavior of a Fe-modified Al3Ti-base L12 intermetallic alloy
TLDR
In this paper, the microstructure of the ordered intermetallic alloy with a nominal composition of Al66Fe9Ti24 is nearly single-phase L12 structure, with a few second phase agglomerates at some grain corners.Abstract:
The microstructure of the ordered intermetallic alloy with a nominal composition of Al66Fe9Ti24 is nearly single-phase L12 structure, with a few second phase agglomerates at some grain corners. Room temperature compression tests showed that this material exhibits a plastic strain of about 11% at fracture. Final fracture of the compression specimens occurred by a shear-off process along a surface oriented about 45 degrees to the compression axis. Fractographic analysis revealed that the fracture is transcrystalline and the fracture mode is mainly quasicleavage plus tearing. Transmission electron microscopy (TEM) was used to explore its deformation mechanisms. The dislocation density was low after homogenization, but is greatly increased during deformation. The deformation mode was found to be 〈110〉 {111} slip instead of twinning as in Al3Ti. The a〈110〉 superdislocations dissociated into two partials of a/3〈211〉-type, bounding a superlattice intrinsic stacking fault (SISF) on the {111} slip plane.read more
Citations
More filters
Journal ArticleDOI
Structure of dislocation cores in metallic materials and its impact on their plastic behaviour
TL;DR: In this paper, a general discussion of planar and non-planar dislocation cores is presented, in which the dislocation splitting and core phenomena are combined into one notion.
Book ChapterDOI
Chapter 53 Microscopy and plasticity of the L12 γphase
Patrick Veyssière,Georges Saada +1 more
TL;DR: In this article, the microscopy and plasticity of the L 1 2 γ´ Phase were discussed and macroscopic mechanical properties, including deformation under constant strain rate, creep, and the analysis of transient tests.
Journal ArticleDOI
A Review of Methods for Detecting Melamine in Food Samples.
TL;DR: The state-of-the-art methods used for food sample preparation as well as the various detection techniques available for melamine are summarized and combinations of multiple techniques and new materials used in the detection have been reviewed.
Journal ArticleDOI
Design of Inserts for Split-Hopkinson Pressure Bar Testing of Low Strain-to-Failure Materials
TL;DR: In this article, a new insert design is presented and validated to enable reliable dynamic mechanical characterization of low strain-to-failure materials using the Split-Hopkinson Pressure Bar (SHPB) apparatus.
Journal ArticleDOI
Tensile behavior of the L12 compound Al67Ti25Cr8
K.S. Kumar,S.A. Brown +1 more
TL;DR: In this paper, temperature-related variations in tensile yield strength and ductility were studied on cast, homogenized and isothermally forged Al67Ti25Cr8.
References
More filters
High-temperature ordered intermetallic alloys
TL;DR: In this article, the authors describe the behavior of grain boundaries in a two-dimensional model ordered alloy and the effects of elastic anisotropy on the anomalious yield behavior of cubic ordered alloys.
Journal ArticleDOI
Diffraction contrast of electron microscope images of crystal lattice defects. III. Results and experimental confirmation of the dynamical theory of dislocation image contrast
TL;DR: In this article, the authors derived numerical solutions for the transmitted and diffracted wave intensities when electrons pass through a thin foil containing a dislocation, by the use of a previously derived formulation of dynamical diffraction theory which takes account of anomalous absorption effects.
Journal ArticleDOI
Partial dislocations associated with NbC precipitation in austenitic stainless steels
Jeanne M. Silcock,W. J. Tunstall +1 more
TL;DR: In this article, a systematic electron microscope investigation has been made of the partial dislocations bounding stacking faults in niobium-containing austenitic stainless steels, and it was concluded that the outer partials are Franks, the inner partials were Shockleys, and the faults are extrinsic.
Journal ArticleDOI
New cubic phases formed by alloying Al3Ti with Mn and Cr
S. Zhang,J.P. Nic,D.E. Mikkola +2 more
TL;DR: In this article, it has been found that Mn or Cr can substitute for Al in Al 3 Ti and change the crystal structure from tetragonal DO 22 to cubic L 1 2.
Journal ArticleDOI
Electron Microscopic Images of Single and Intersecting Stacking Faults in Thick Foils. Part I: Single Faults
R. Gevers,A. Art,S. Amelinckx +2 more
TL;DR: In this paper, it is shown that the amplitudes of the transmitted and scattered waves can be simplified considerably by introduction of a simple approximation, and the properties suggested by the numerical calculations of HASHIMOTO et al. can then be expressed and discussed in a more precise analytical way.