Short range order in Ni4Mo and its high resolution electron microscope images

被引：16

作者：

Hata, S ^{[1
]}

Matsumura, S

Kuwano, N

Oki, K

Shindo, D

机构：

[1] Kyushu Univ, Grad Sch Engn Sci, Dept Mat Sci & Technol, Fukuoka 8168580, Japan

[2] Kyushu Univ, Fac Engn, Dept Nucl Engn, Fukuoka 8128581, Japan

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

来源：

ACTA MATERIALIA | 1998年 / 46卷 / 14期

关键词：

D O I：

10.1016/S1359-6454(98)00180-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The short range ordered (SRO) structure in Ni4Mo has been investigated by means of high resolution transmission electron microscopy with digital image processing and Monte Carlo simulation. High resolution transmission electron microscope (HRTEM) images were recorded with an Imaging Flare (IP) system. Conventionally printed images of the SRO state exhibit locally dot patterns corresponding to N2M2-type (chalcopyrite-like) structure. However, the dot patterns transform into those of subunit cell clusters of D1(a), D0(22) and Pt2Mo structures, when the image is output with a different gray scale. The Monte Carlo simulation with appropriate interaction parameters of atoms has explained successfully the HRTEM images. It is concluded that the SRO state in Ni4Mo involves subunit cell clusters of D1(a), D0(22) and Pt2Mo structures in the atomistic level of microstructure. The concept of [1 1/2 0]* static concentration waves corresponding to the N2M2 pattern is rationalized as a mesoscopically averaging view of the SRO state. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：4955 / 4961

页数：7

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