HRTEM image contrast of short range order in Ni4Mo

被引：20

作者：

Hata, S ^{[1
]}

Shindo, D

Mitate, T

Kuwano, N

Matsumura, S

Oki, K

机构：

[1] Kyushu Univ, Dept Appl Sci Elect & Mat, Kasuga, Fukuoka 8168580, Japan

[2] Tohoku Univ, Inst Adv Mat Proc, Sendai, Miyagi 9808577, Japan

[3] Kyushu Univ, Dept Appl Quantum Phys & Nucl Engn, Fukuoka 8128581, Japan

来源：

MICRON | 2000年 / 31卷 / 05期

关键词：

high resolution transmission electron microscopy (HRTEM); short range order (SRO); Ni4Mo alloy; multi-slice image simulation; Monte Carlo simulation; dynamical electron diffraction; diffuse scattering; projected potential;

D O I：

10.1016/S0968-4328(99)00134-1

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

The high resolution transmission electron microscope (HRTEM) imaging of short range order (SRO) in Ni4Mo was investigated by means of multi-slice image simulations. The HRTEM images of Ni4Mo exhibit locally bright dot patterns corresponding to the [001] projections of the N2M2-type (chalcopyrite-like) structure. The multi-slice simulations revealed that the N2M2 patterns are rationalized as the projection patterns of the SRO structure which consists of subunit cell clusters of D1(a), D0(22) and Pt2Mo structures. The N2M2-type image contrast appears when both the fundamental fee lattice reflections and the 1 1/2 0 diffuse scattering of SRO contribute enough to imaging. This suggests that a good coincidence in intensity distribution between the Fourier power spectra of HRTEM images and the electron diffraction patterns is one of the conditions for the image contrast of SRO to be interpreted in terms of the projection contrast. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：533 / 538

页数：6

共 12 条

[1] On the interpretation of HREM images of partially ordered alloys [J].

DeMeulenaere, P ;

VanTendeloo, G ;

VanLanduyt, J ;

VanDyck, D .

ULTRAMICROSCOPY, 1995, 60 (02) :265-282

[2] DYNAMICAL ELECTRON-DIFFRACTION IN SUBSTITUTIONALLY DISORDERED COLUMN STRUCTURES [J].

DEMEULENAERE, P ;

VANDYCK, D ;

VANTENDELOO, G ;

VANLANDUYT, J .

ULTRAMICROSCOPY, 1995, 60 (01) :171-185

[3] K-SPACE SYMMETRY RULES FOR ORDER-DISORDER REACTIONS [J].

FONTAINE, DD .

ACTA METALLURGICA, 1975, 23 (05) :553-571

[4] Short range order and its transformation to long range order in Ni4Mo [J].

Hata, S ;

Matsumura, S ;

Kuwano, N ;

Oki, K .

ACTA MATERIALIA, 1998, 46 (03) :881-892

[5] Short range order in Ni4Mo and its high resolution electron microscope images [J].

Hata, S ;

Matsumura, S ;

Kuwano, N ;

Oki, K ;

Shindo, D .

ACTA MATERIALIA, 1998, 46 (14) :4955-4961

[6]

HATA S, 1998, P 3 PAC RIM INT C AD, V1, P1411

[7] COMPUTER-SIMULATION OF THE EARLY STAGES OF ORDERING IN NI-MO ALLOYS [J].

KULKARNI, UD ;

MURALIDHAR, S ;

BANERJEE, S .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 1988, 110 (02) :331-345

[8] HIGH-RESOLUTION ELECTRON-MICROSCOPIC STUDY OF THE ORDERING PROCESSES IN NI4MO ALLOY [J].

LEE, KH ;

HIRAGA, K ;

SHINDO, D ;

HIRABAYASHI, M .

ACTA METALLURGICA, 1988, 36 (03) :641-649

[9] DYNAMICAL DIFFRACTION EFFECTS ON HIGH-RESOLUTION ELECTRON-MICROSCOPY OF ORDERED ALLOYS [J].

SHINDO, D ;

HIRABAYASHI, M .

ACTA CRYSTALLOGRAPHICA SECTION A, 1988, 44 :954-960

[10] X-RAY STUDY OF SHORT-RANGE ORDER IN NICKEL ALLOYS CONTAINING 10.7 AND 20.0 AT PERCENT MOLYBDENUM [J].

SPRUIELL, JE ;

STANSBURY, EE .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1965, 26 (05) :811-+

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