Transmission Electron Microscope Analysis of Grain Boundaries, Twins, and Planar Defects in Cr<SUB>2</SUB>B- and Fe<SUB>2</SUB>B-Type Borides

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  • 透過電子顕微鏡によるCr<SUB>2</SUB>B型およびFe<SUB>2</SUB>B型ホウ化物の結晶粒界，双晶，および面欠陥の観察
  • 透過電子顕微鏡によるCr2B型およびFe2B型ホウ化物の結晶粒界,双晶,および面欠陥の観察
  • トウカ デンシ ケンビキョウ ニ ヨル Cr2Bガタ オヨビ Fe2Bガタ ホ

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Abstract

Microstructures of Cr2B- and Fe2B-type borides, which were formed in the surface of SUS-304 by immersing into molten salt, were examined by means of electron diffraction and dark-field imaging techniques as well as high resolution electron microscopy. The orientation relationship between the Cr2B- and Fe2B-type structures was determined to be Cr2B (100)\varparallelFe2B (1\bar10) and Cr2B [001]\varparallelFe2B [111]. The Fe2B-type structure was found to have a twin with the [111] twin axis. The boundary of the twin lies macroscopically on the (1\bar10) plane, while micro-intergrowth of the two structures was observed near the boundary. Interpretation of the high resolution image of the intergrowth region indicated the existence of the following two kinds of defects; a twin of the Cr2B-type structure with the [011] twin axis and a (1\bar10) planar defect of the Fe2B-type structure. Geometrical consideration of the Cr2B- and the Fe2B-type structures indicates that both structures can be regarded as a layer-structure: they have almost the same component layers but have different stacking scheme. Atomic arrangements near the observed defects were interpreted from the geometrical similarity of the two structures.

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