塑性変形に伴うFe中Cu析出粒子構造変化のXAFS観察(相変態・材料組織)

概要

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It is well known that Cu particles precipitate during aging from super-saturated ferrite Fe initially as bcc structure, then transform to stable fee 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.
社団法人日本鉄鋼協会の論文
2008-03-01