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KMID : 0381920030330010049
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Korean Journal of Microscopy
2003 Volume.33 No. 1 p.49 ~ p.58
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A Study of Titanium Phase Transition through In-situ EF-TEM Heating Experiments
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Kim Jin-Gyu
Lee Young-Bu
Kim Youn-Joong
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Abstract
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The α-β phase transition of titanium was investigated through in-situ EF-TEM heating experiments. Three different areas of a titanium foil were observed to minimize statistical errors. Systematic recording of diffraction patterns and images was carried out from RT→600℃→900℃→RTon each area. The following results were obtained: (1) Transition of titanium takes place very rapidly at 900℃. Two phases of titanium, α and β, coexist at this temperature. (2) The transited β-phase appears in the form of twinned plates which are arranged in rotation relationship one another. (3) Analyses of electron diffraction patterns and EDS data indicate that the thermal oxidation layer is gradually formed on the surface of titanium above 900℃, which hinders the reversible htarrowβ}β→α phase transition upon cooling.
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KEYWORD
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Martensite, Phase Transition, Thermal Oxidation, Titanium, Twining
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