Crystallographic features of the ν phase in the Mn-Si binary alloy system

Kei Nakayama, Shouhei Yabu, Takashi Mizuno, Yasumasa Koyama

研究成果: Conference contribution

抄録

In the Mn-Si alloy system, there is the intermetallic-compound ν phase around Mn-18at.%Si. Its crystal structure called the ν structure has been reported to involve complex coordination polyhedra with coordination numbers (CN's) 12, 14, and others. To clarify whether one of these polyhedra can be identified as a structural unit or not in the ν structure, we have investigated the crystallographic features of the (R → R + ν) reaction in Mn-15at.%Si alloy samples by transmission electron microscopy. In Mn-15at.%Si samples obtained by cooling from the single R phase at a relatively fast cooling rate, metastable precipitates were found to be present in the R-structure matrix. Their notable feature is that each precipitate involves regions exhibiting characteristic electron diffraction patterns, which indicate the presence of metastable states, in addition to the initial amorphous and final ν states. Based on the careful analysis of these patterns, it was understood that the metastable states were directly associated with the formation of the ν structure, and that the formation started with the appearance of dodecagonal atomic columns. Because a dodecagonal column is characterized by a one-dimensional array of CN14 polyhedra, among the coordination polyhedra involved in the ν structure, a CN14 polyhedron can be identified as its structural unit.

本文言語English
ホスト出版物のタイトルTHERMEC 2013 Supplement
出版社Trans Tech Publications
ページ525-530
ページ数6
ISBN(印刷版)9783038350743
DOI
出版ステータスPublished - 2014
イベント8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013 - Las Vegas, NV, United States
継続期間: 2013 12 22013 12 6

出版物シリーズ

名前Advanced Materials Research
922
ISSN(印刷版)1022-6680

Conference

Conference8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013
国/地域United States
CityLas Vegas, NV
Period13/12/213/12/6

ASJC Scopus subject areas

  • 工学(全般)

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