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Title: Transmission electron microscopy crystal structure study of the Cr-rich phase in a laser-clad Ni alloy

Abstract

The point group and space group of an unknown Cr-rich phase in Ni alloy laser clads were identified with convergent beam electron diffraction (CBED). Zone axis symmetry analysis showed that the point group of the phase was 6/mmm. Further examination by zero intensity lines (GM lines) revealed the existence of a 63 screw axis and a glide plane. The space group was then identified as P63/MMC. By referring to [0001] zone axis high-resolution electron microscopy (HREM) images, a structure model with 12 Cr atoms at 12 k positions and 2 Ni atoms at 2 b positions, as listed in space group P6[sub 3]/mmc, was proposed. The alloying elements were considered to be distributed in the Ni lattice. Simulated [0001] and [11[bar 2]0] HREM images using the proposed model showed a close match with corresponding transmission electron microscopy (TEM) images.

Authors:
;  [1];  [2]
  1. (Univ. of Illinois, Urbana, IL (United States))
  2. (Nissan Motor Co. Ltd., Yokosuka (Japan). Nissan Research Center)
Publication Date:
OSTI Identifier:
7284347
DOE Contract Number:  
FG02-91ER45439
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
Additional Journal Information:
Journal Volume: 25:3; Journal ID: ISSN 0360-2133
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM ALLOYS; CRYSTAL STRUCTURE; NICKEL ALLOYS; EXPERIMENTAL DATA; PHASE STUDIES; ALLOYS; DATA; INFORMATION; NUMERICAL DATA; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Liu, Y., Mazumder, J., and Shibata, K.. Transmission electron microscopy crystal structure study of the Cr-rich phase in a laser-clad Ni alloy. United States: N. p., 1994. Web. doi:10.1007/BF02651590.
Liu, Y., Mazumder, J., & Shibata, K.. Transmission electron microscopy crystal structure study of the Cr-rich phase in a laser-clad Ni alloy. United States. doi:10.1007/BF02651590.
Liu, Y., Mazumder, J., and Shibata, K.. Tue . "Transmission electron microscopy crystal structure study of the Cr-rich phase in a laser-clad Ni alloy". United States. doi:10.1007/BF02651590.
@article{osti_7284347,
title = {Transmission electron microscopy crystal structure study of the Cr-rich phase in a laser-clad Ni alloy},
author = {Liu, Y. and Mazumder, J. and Shibata, K.},
abstractNote = {The point group and space group of an unknown Cr-rich phase in Ni alloy laser clads were identified with convergent beam electron diffraction (CBED). Zone axis symmetry analysis showed that the point group of the phase was 6/mmm. Further examination by zero intensity lines (GM lines) revealed the existence of a 63 screw axis and a glide plane. The space group was then identified as P63/MMC. By referring to [0001] zone axis high-resolution electron microscopy (HREM) images, a structure model with 12 Cr atoms at 12 k positions and 2 Ni atoms at 2 b positions, as listed in space group P6[sub 3]/mmc, was proposed. The alloying elements were considered to be distributed in the Ni lattice. Simulated [0001] and [11[bar 2]0] HREM images using the proposed model showed a close match with corresponding transmission electron microscopy (TEM) images.},
doi = {10.1007/BF02651590},
journal = {Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)},
issn = {0360-2133},
number = ,
volume = 25:3,
place = {United States},
year = {1994},
month = {3}
}