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ZHANG Wei, PANG Bijun, ZHANG Jinmin. Twin microstructure phase and formation mechanisms of aluminized coating[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (12): 49-52.
Citation: ZHANG Wei, PANG Bijun, ZHANG Jinmin. Twin microstructure phase and formation mechanisms of aluminized coating[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (12): 49-52.
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Twin microstructure phase and formation mechanisms of aluminized coating

  • 1.

    Department of Mechanical and Electrical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China

  • 2.

    Mathematical Science College, Luoyang Normal University, Luoyang 471022, China

  • 3.

    laboratory of Electron Microscopy, Luoyang Ship Material Research Institute, Luoyang 471039, China

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  • Received Date: May 22, 2008
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    • Abstract
  • The La-aluminized coating on 20-carbon-steel was prepared by hot dip aluminizing method.The microstructure of Al4C3 phase in the coating was investigated through transmission electron microscope (TEM)after diffusion treatment at 850℃ for 4 h.The results indicate that the Al4C3 phases are rod-shaped and approximately sphericized, and the twinned Al4C3 phases exist in the coating.By using conversion matrix of twin index and the conversion matrix acting on twin index, it is proved that the Al4C3 phases are 180° secondary rotation twin with (003)as twinning plane and [001] direction as twinning axis.The long axis direction of rod-shaped Al4C3 phases is parallel to (003)plane and perpendicular to [001] direction, and its long axis direction is [210] direction.This shows that there is 180°secondary rotation twin with (003) as twinning plane and [001] direction as twinning axis in hexagonal system.The formation mechanism of the twinned Al4C3 phases is also discussed in the paper.
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