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KMID : 0381920070370020123
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Korean Journal of Microscopy
2007 Volume.37 No. 2 p.123 ~ p.133
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LACBED Observation of Strain Fields due to Precipitates, Especially S-Phase Particles in Al-Cu-Mg Alloy
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Kim Hwang-Su
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Abstract
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The strain fields due to precipitates, especially S-phase (Al2CuMg) particles in Al-2.5Cu-1.5Mg wt.% alloy were first investigated with Large Angle Convergent Beam Electron Diffraction (LACBED) method. The work involves LACBED pattern simulations to estimate possibly the strength of the strain fields. To do this the morphology of S-particle was optimized as a cylindrical shape with as axis, and the displacement vector of strain fields was assumed to be perpendicular to as axis. With this simple model the reasonable fittings between the observed patterns of the strain fields and simulations were obtained. And in the early aging stage of the alloy the significant strain fields were not observed. As a result of this study it is expected that the strain fields due to S-phase precipitates in the stage with maximum hardness would make a complex networks to possibly contribute to hardiness of the alloy.
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KEYWORD
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Al-Cu-Mg, LACBED, S-Phase Precipitate, Strain Fields
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