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Short range order structures in fcc-based Ni-Mo studied by high resolution transmission electron microscopy with image processing

被引：26
作者：
Hata, S [1 ]
Mitate, T
Kuwano, N
Matsumura, S
Shindo, D
Oki, K
机构：
[1] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Dept Appl Sci Elect & Mat, Fukuoka 8168580, Japan
[2] Kyushu Univ, Adv Sci & Technol Ctr Cooperat Res, Fukuoka 8168580, Japan
[3] Kyushu Univ, Dept Nucl Engn, Fukuoka 8128581, Japan
[4] Tohoku Univ, Inst Adv Mat Proc, Sendai, Miyagi 9808577, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2001年 / 312卷 / 1-2期
基金：
日本学术振兴会;
关键词：
Ni-Mo alloy; short range order; high resolution transmission electron microscopy; Monte Carlo simulation; multi-slice simulation;
D O I：
10.1016/S0921-5093(00)01872-4
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Modern high resolution transmission electron microscopy was employed in study of short range order (SRO) in fcc-based Ni-Mo, which is classified as '1 1/2 0 alloy'. Digital processing of high resolution transmission electron microscope (HRTEM) images can give information about local atomic arrangements of SRO as well as their projection views. The HRTEM observation with image processing reveals the SRO structures in Ni-Mo depending upon the alloy composition and the heat treatment. Subunit cell clusters of D1(a), D0(22) and Pt2Mo structures are generated in the SRO states of Ni4Mo and Ni3Mo alloys. In the initial SRO states, the number of Pt2Mo type clusters increases with Mo composition while that of D1(a) type decreases. The D1(a), D0(22) and Pt2Mo type clusters increase in number in the early stages of subsequent ordering. The formation of D1(a), D0(22) and Pt2Mo type clusters in the SRO states is rationalized in terms of the similar tendencies in atomic configuration between D1(a), D0(22) and Pt,Mo structures. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：160 / 167
页数：8
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