超高圧電顕弱ビーム法による転位バーガースベクトルの決定

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タイトル別名
  • Determination of the Burgers Vector of a Dislocation by Weak-Beam Image in HVEM
  • チョウ コウ アツデン ケンジャクビームホウ ニヨル テンイ バーガース ベク

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説明

Exact determination of the Burgers vector of the dislocation is performed by the weak-beam “fringe counting” technique. Both the magnitude and the sense of the Burgers vector are determined exactly from the number of the terminating thickness fringes at the exit of the dislocation from the wedge shaped foil. The number is equal to the inner product of the Burgers vector and the diffracting vector. Thickness fringes in the foil of Al-Mg and Fe-Mn alloys were examined by an 1 MV electron microscope for diffractions up to {211} in BCC and {220} in FCC crystals. A complete determination of the Burgers vector is achieved when three weak-beam micrographs with the diffraction vectors not sharing a plane are compared in the same area. When the possibility of the Burgers vector is limited within basic lattice vectors, the identification can be made with little tilting of the specimen. The small tilt angle and the narrowness of the dislocation image are helpful in the analysis of relatively dense dislocation structure.<BR>It is concluded that the present technique may be utilized as the standard technique for the determination of the Burgers vector in metals and alloys, in place of the conventional ones.

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  • 日本金属学会誌

    日本金属学会誌 44 (3), 288-293, 1980

    公益社団法人 日本金属学会

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