原子直視電子顕微鏡とTV画像処理による極微小高速原子運動直視の研究と応用

1992 Fiscal Year Annual Research Report

• Project/Area Number: 03452084
• Research Institution: OKAYAMA UNIVERSITY OF SCIENCE
• Principal Investigator: 橋本 初次郎 岡山理科大学, 工学部, 教授 (30027726)
• Co-Investigator(Kenkyū-buntansha): 横田 康広 岡山理科大学, 理学部, 助教授 (50200902) ; 助台 栄一 岡山理科大学, 工学部, 教授 (00090217)
• Keywords: 微小原子運動 / TV画像処理 / 画像減算 / 結晶内原子のゆらぎ

Research Abstract

高分解能電子顕微鏡で観察中の結晶格子内原子が電子照射にともない局所的に原子格子間隔(〜2A^^○)以下の動きでゆらぎを生じていることを可視化するためTVとコンピュータを併用し記録画面の引き算を試み、原子間隔の1/10程度以上の変動(0.2A^^○)を1/30秒以上の微小時間範囲内で観察記録することを精度よく、かつ高能率で実施することができた。
この実施における過程と成果は次の如くである
1)画像処理装置オリンパスAVIOXL-500およびタイムベースコレクター(ビクターSAT400)を購入し用いた。
2)XL-500をパソコンで操作し、微小変動をする原子とその変動量を検出するカラー画像を得た。これはすでに何度か行った実験とプログラムの改造により画像処理を施した結果で満足な成果を得た。
3)カルフォルニア大学バークレイ校を訪ねNCEMの1MV原子分解電子顕微鏡(ARM)を用いてSiおよびPtの規則正しい完全格子に800kVの電子を照射し、加速電圧を一部変えて、その原子格子像をビデオテープに記録した。これを本方法で像解析を行なった。これの成果は照射損傷の素過程について考察が行えるレベルにまで達している。
4)Ni50Ti50の形状記憶合金を用い、それがマルテンサイトよりオーステナイトにかわり始める温度(75℃)から、それがかわり終るまでの温度にわたり原子の動きを追跡しVTRに記録した。像のドリフトを防止していくつかのデータを得ることができた。結晶の方位を微細に調整すれば原子移動が直接観察できるまでに達した。現在の段階では試料方位の調整が75℃付近の高温ででは完全にはできなかったので決定な結果はまだ得られていない。これについては研究を続行中なので近々結果が出せるものと考えている。

Research Products

• [Publications] H.Hashimoto: "Observation on quick fluctuation of atom images of Si crystal lattice under 800 kV electron irradiation" Ultramicroscopy. 39. 171-179 (1991)
• [Publications] H.Hashimoto: "Detection atom movement of 0.05-O.01 nm in 1/30 seconds" Electron Microscopy(Beijing). A. 75-76 (1991)
• [Publications] H.Hashimoto: "Observation of movement of atom images of 0.05-0.1 nm in 1/30 second" Electron Microscopy(Proc. 49th EMSA meeting). 658-659 (1991)
• [Publications] M.Awaji: "Calculated image contrast of vacancies in silicon crystal and representation of their contrast anomalies" Electron Microscopy(Proc.49th EMSA meeting). 694-695 (1991)
• [Publications] Hashimoto.H: "Images of Th atoms and clusters taken by imaging plate and TV at 200kV,400kV and 800kV" Electron Microscopy(Proc.EUREM92(Granada)). 1. 101-102 (1992)
• [Publications] H.Hashimoto: "Double tilting specimen holder cooled by liquid helium for JEM4000EX" Electron Microscopy(Proc.50th EMSA meeting(Boston)). 962-963 (1992)
• [Publications] E.Sukedai: "Atomic structure of interface of intermetallic compound TiAl and nitride Ti^2AIN using HREM and image processing" Electron Microscopy(Proc.49th EMSA meeting(San Jose)). 570-571 (1991)
• [Publications] E.Sukedai: "Investigation of omega-phase in Ti-Mo alloys by high resolution electron microscopy,images processing and dark-field methods" Philosophical Magazine A. 64. 1201-1208 (1991)
• [Publications] Zhiyi Song: "HREM observation of interface between precipitates and martensite of reversible shape memory alloy Ni-Ti" Electron Microscopy(Proc.49th EMSA meeting(San Jose)). 596-597 (1991)
• [Publications] E.Sukedai: "Investigation of volume fraction of omega particles and hardness value of aged Ti-Mo alloy using dark-field TEM imaging" Electron Microscopy(Proc.50th EMSA meeting(Boston)). 310-311 (1992)
• [Publications] 助台 栄一: "電子顕微鏡暗視野像法によるTi-Mo合金の時効オメガ相粒子の体積分率の決定" 日本金属学会誌. 56. 1392-1400 (1992)
• [Publications] M.Awaji: "Calculated intensities of electron waves diffracted from Ti-14wt% Mo alloy containing ω-phase crystal" Acta Crystallographica B. 48. 622-627 (1992)
• [Publications] H.Hashimoto: "Atomic structure images formed by core loss electrons" Electron Microscopy(Proc.50th EMSA meeting(Boston)). 1194-1195 (1992)
• [Publications] Z.Y.Song: "Stacking faults in plastically deformed FeAlalloy with the B2 structure" Philosophical Magazine A. 64. 333-339 (1991)
• [Publications] Hatsujiro Hashimoto: "Achievement of atomic resolution transmission electron microscopy and its application to materials science" International Symposium on Electron Microscopy(Beijing). 278-299 (1991)
• [Publications] X.J.Wu: "TEM study on overlapped twins in GaAs crystal" Philosophical Magazine B. 63. 931-939 (1991)
• [Publications] M.Song: "Cross-sectional observation of LSI of 4 M bit DRAM by high resolution" J.Electron Microscopy. 41. 337-349 (1992)
• [Publications] F.H.Li: "Phason-strain identification for quasicrystals by high-resolution electron microscopy" Ultramicroscopy. 45. 299-305 (1992)
• [Publications] H.Hashimoto: "Some aspects of present and future high resolution electron microscopy and image processing" Electron Microscopy(Proc.5th APEM conference(Beijing)). 2-7 (1992)
• [Publications] Y.Makita: "Directional distribution of oscillation of atoms in crystal under EM observation" Electron Microscopy(Proc.5th APEM conference(Beijing)). 216-217 (1992)
• [Publications] G.Z.Pan: "Commensurate and incommensurate structural modulation in antigorite" Electron Microscopy(Proc.5th APEM conference(Beijing)). 228-229 (1992)
• [Publications] Delu Liu: "HREM study of martensite in Cu-11.2Al-2.9Ni" Electron Microscopy(Proc.5th APEM conference(Beijing)). 302-303 (1992)
• [Publications] E.Sukedai: "HREM study of interface of a TiAl-base composite material containing Ti^2AIC" Electron Microscopy(Proc.5th APEM conference(Beijing)). 316-317 (1992)
• [Publications] M.Awaji: "HRTEM image contrast of omega phase formed in Ti-20mass%Mo alloy" Electron Microscopy(Proc.5th APEM conference(Beijing)). 328-329 (1992)
• [Publications] N.Nagaoka: "Structure images of interface of martensite and austenite in shape memory alloy NiTi" Electron Microscopy(Proc.5th APEM conference(Beijing)). 378-379 (1992)
• [Publications] Y.Li: "Atomic structure images of laser molten M80S20 powders with rare earth element on low carbon steel" Electron Microscopy(Proc.5th APEM conference(Beijing)). 382-383 (1992)
• [Publications] Y.Yokota: "Cross-sectional TEM observation on machined aluminum" Electron Microscopy(Proc.5th APEM conference(Beijing)). 388-389 (1992)
• [Publications] Y.D.Yu: "Evaporation and oxidation of ultrafine copper particles caused by electron beam irradiation" Electron Microscopy(Proc.5th APEM conference(Beijing)). 604-605 (1992)
• [Publications] D.Yoshihara: "Electron microscope observations of synthesized boehmite(A100H)" Electron Microscopy(Proc.5th APEM conference(Beijing)). 608-609 (1992)
• [Publications] Sukedai.E: "Investigation about change of microstructure of omega particle in Ti-20mass%Mo alloy due to aging using high resolution electron microscopy and image processing methods" Electron Microscopy(Proc.EUREM92(Granada)). 1. 547-548 (1992)
• [Publications] E.Sukedai: "Volume fraction of four kinds of omega phase variants in aged Ti-Mo alloy studied by dark field imaging with a small objective aperture" EMAG91(Bristol). 245-248 (1991)
• [Publications] E.Sukedai: "Investigation of interface between intermetallic compound TiAl and Ti2AIN of a composite material prepared by a new combustion reaction method using high resolution electron microscopy" Proc.International Symposium on Intermetallic Compounds (Sendai). 991-995 (1991)
• [Publications] E.Sukedai: "Formation of ω phase in Ti-Mo alloys after aging and deforming" Malterials Science and Technology. 8. 3-9 (1992)