Nanoscale AFM and TEM Observations of Elementary Dislocation Mechanisms
This thesis addresses elementary dislocation processes occurring in single-crystalline alloys based on Fe-Al, and investigates correspondences between dislocation distribution inside crystals characterized by transmission electron microscopy (TEM) and surface patterns observed using atomic force microscopy (AFM). Fe-Al alloys with different degrees of ordering were prepared and deformed in compression at ambient temperature in-situ inside the AFM device. The evolution of slip line structures was captured in the sequences of AFM images and wavy slip bands, while cross slip at the tip of the slip band and homogeneous fine slip lines were also identified. Further, the thesis develops a technique for constructing 3D representations of dislocations observed by TEM without the prohibitive difficulties of tomography, and creates 3D models of dislocation structures. Generally speaking, the thesis finds good agreement between AFM and TEM observations, confirming the value of AFM as a relevant tool for studying dislocations.
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Nanoscale AFM and Tem Observations of Elementary Dislocation Mechanisms
No preview available - 2019
AFM images AFM observations annealed anti-phase domains anti-site atoms atomic force microscopy axis B2-type intermetallic compound beam Burgers vector cantilever carbide particles composition Coupeau cross slip crystallographic D03 structure dark field determined diffraction conditions direction dislocation line dislocation structures Elementary Dislocation Mechanisms Fe-Al FeAl feedback loop grain Haraguchi Hough transform in-situ deformation ingots interaction investigated Kikuchi lines Kogachi lattice parameter Laue match materials method MRSS plane Nanoscale AFM Observations of Elementary orientation relationship pairs peak Phys Point defect polishing Polym Publishing AG 2017 reconstruction room temperature rotation matrix scanning Scanning probe microscopy scanning tunneling microscopy screw Sect sequences shows single crystals slip bands slip lines slip system slip traces specimen Springer International Publishing step Stepper motor stoichiometry straight dislocation surface tomographic reconstruction tomography transform Transmission electron microscopy triple defect undeformed vacancy concentration Veselư yield stress yield stress anomaly