Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Regular Article
XAFS Observation to Investigate Possible Change in Crystal Structure of Cu Precipitates in Iron during Plastic Deformation
Hiroshi YaguchiMasahiro NomuraTakashi Watanabe
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2008 Volume 94 Issue 3 Pages 86-90

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Abstract

It is well known that Cu particles precipitate during aging from super-saturated ferrite Fe initially as bcc structure, then transform to stable fcc structure as aging progresses to over-aging. It is also well known that the structure transformation goes through intermediate structures such as 3R and 9R. Several previous investigations have suggested that plastic deformation enhances structure transformation of meta-stable precipitates. However, no direct experimental evidence to show this hypothesis has been observed. SR-X-ray absorption fine structure (XAFS) is a useful method to analyze crystal structure of Cu precipitates in Fe. XAFS profiles were compared before and after plastic deformation. A possibility of transformation in crystal structure was observed when Cu precipitates were most likely meta-stable condition.

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© 2008 The Iron and Steel Institute of Japan
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