Memoirs of the Faculty of Science, Shimane University

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Memoirs of the Faculty of Science, Shimane University 24
1990-12-25 発行

低転位密度アルミニウム単結晶における原子空孔の生成

Vacancy Generation in Aluminum Single Crystal with a Low Dislocation Density
Ono, Kotaro
Ito, Kazuyoshi
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Description
Vacancy generation process m nearly perfect aluminum single crystal was investigated by means of a shape of helical dislocation by X-ray diffraction topography, using a translation type high temperature Lang camera. Helical dislocations as a vacancy source were observed after temperature rise . The shape of helix at initial stage of the appearance looked like a coil spring. But the shape changed to the helix refiected the crystal structure of specimen with the lapse of time. Under-saturation of vacancy in the specimen was estimated from the size of helix. In the results , most of vacancies were emitted from dislocations existed in as-grown nearly perfect crystals, and it takes several hours to achieve the equilibrium concentration of vacancy after a temperature rise.