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

Authors
Hata, S Mitate, T Kuwano, N Matsumura, S Shindo, D Oki, K
Citation
S. Hata et al., Short range order structures in fcc-based Ni-Mo studied by high resolutiontransmission electron microscopy with image processing, MAT SCI E A, 312(1-2), 2001, pp. 160-167
Citations number
46
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
312
Issue
1-2
Year of publication
2001
Pages
160 - 167
Database
ISI
SICI code
0921-5093(20010815)312:1-2<160:SROSIF>2.0.ZU;2-V
Abstract
Modern high resolution transmission electron microscopy was employed in stu dy 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 arrangeme nts of SRO as well as their projection views. The HRTEM observation with im age 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 al loys. In the initial SRO states, the number of Pt2Mo type clusters increase s 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 subseque nt 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 con figuration between D1(a), D0(22) and Pt,Mo structures. (C) 2001 Elsevier Sc ience B.V. All rights reserved.