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luyunrosa木虫 (小有名气)
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Explain what is "EBSD"
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Explain what is "ebsd"--electric backscatter diffraction. The materials is writing in English. it is good for beginner. Section 1 Basics of EBSD Principal system components The principal components of an EBSD system are ■ A sample tilted at 70° from the horizontal. ■ A phosphor screen which is fluoresced by electrons from the sample to form the diffraction pattern. ■ A sensitive charge coupled device (CCD) video camera for viewing the diffraction pattern on the phosphor screen. ■ A vacuum interface for mounting the phosphor and camera in an SEM port. The camera monitors the phosphor through a lead glass screen in the interface, and the phosphor can be retracted to the edge of the SEM chamber when not in use. ■ Electronic hardware that controls the SEM, including the beam position, stage, focus, and magnification. ■ A computer to control EBSD experiments, analyze the diffraction pattern and process and display the results. ■ An optional electron detector mounted below the phosphor screen for electrons scattered in the forward direction from the sample. For EBSD, a beam of electrons is directed at a point of interest on a tilted crystalline sample in the SEM (Figure 2). The mechanism by which the diffraction patterns are formed is complex, but the following model describes the principal features. The atoms in the material inelastically scatter a fraction of the electrons, with a small loss of energy, to form a divergent source of electrons close to the surface of the sample. Some of these electrons are incident on atomic planes at angles which satisfy the Bragg equation: nλ = 2d sin θ (1) where n is an integer, λ is the wavelength of the electrons, d is the spacing of the diffracting plane, and θ is the angle of incidence of the electrons on the diffracting plane. These electrons are diffracted to form a set of paired large angle cones corresponding to each diffracting plane. When used to form an image on the fluorescent screen, the regions of enhanced electron intensity between the cones produce the characteristic Kikuchi bands of the electron back scattered diffraction pattern (Figure 3). Figure 1: Components of an EBSD system Figure 2: Formation of the diffraction pattern Figure 3: A diffraction pattern from nickel collected |
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luyunrosa
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