Lattice Relations and Solidification of the Complex Regular Eutectic (Cr,fe)-(Cr,fe)(23)c-6

Hsuan-Han Lai,Chih-Chun Hsieh,Chi-Ming Lin,Weite Wu

Metals and Materials International（2017）SCI 2区SCI 3区

Department of Materials Science and Engineering

Cited 2|Views10

Abstract

The eutectic (Cr,Fe)-(Cr,Fe)23C6 showed a triaxial fishbone structure and could be categorized as a “complex regular structure”. In this study, the lattice relations of the fishbone (Cr,Fe)23C6 were examined and the solidification process was observed using a transmission electron microscope and a confocal laser scanning microscope. For one of the three fish bones in a eutectic cell, parallel (Cr,Fe)23C6 lamellas at one side of the spine had the same lattice direction, as did those in the (Cr,Fe) phase. The lattices of neighboring (Cr,Fe)23C6 and (Cr,Fe) phases were not coherent. Lamellar (Cr,Fe)23C6 on opposite sides of a spine had different lattice directions, and their lattice boundary was in the spine. By using the confocal laser scanning microscope, the solidification of lamellar eutectic structure could be observed. At the low cooling rate of 5 o C·min-1, parallel lamellas would grow thick blocks instead of thin plates. To obtain a thin lamellar eutectic structure, the cooling rate should be higher, like the rate in welding.

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Key words

complex regular eutectic,(Cr,Fe)(23)C-6,confocal laser scanning microscope

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