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- W2029491736 abstract "Dislocations in as grown titanium single crystals, produced by recrystallization after phase transformation under high vacuum (5 × 10−10 Torr), are studied by X-ray topography. All kinds of line defects are observed: edge, screw, and helical dislocations, prismatic and glissile loops, sub-boundaries and non-identified defects called “black dots”. Their Burgers' vectors are of a or c + a type. It is established that residual impurities, polishing conditions, and the number of cycle around the phase transformation point α ⇄ β, did not increase the number of defects. Particularly, X-ray topography enables to determine that “black dots” did not appear during polishing but are present in the crystals before. Nous avons étudié les dislocations contenues dans les monocristaux de titane obtenus par recristallisation par la méthode du changement de phase et recuit sous ultra-vide. De nombreux types de défauts ont été trouvés: dislocations coins, vis et hélicoídales, boucles glissiles et prismatiques, sous-joints et des défauts non identifiés que nous avons appelés “points noirs”. Les vecteurs de Burgers de ces défauts sont du type a et c + a; nous montrons que les impuretés résiduelles, les conditions de polissage et le nombre de cycles autour du point des transformation α ⇄ β n'augmentent pas le nombre de défauts. D'autre part la topographie montre que les “points noirs” n'apparaissent pas au cours du polissage." @default.
- W2029491736 created "2016-06-24" @default.
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- W2029491736 date "1977-10-16" @default.
- W2029491736 modified "2023-09-25" @default.
- W2029491736 title "X-ray topographic investigation of dislocations in titanium single crystals grown by recrystallization" @default.
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- W2029491736 doi "https://doi.org/10.1002/pssa.2210430208" @default.
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