著者
Kazuhiro Nogita Stuart D. McDonald Arne K. Dahle
出版者
The Japan Institute of Metals and Materials
雑誌
MATERIALS TRANSACTIONS (ISSN:13459678)
巻号頁・発行日
vol.45, no.2, pp.323-326, 2004 (Released:2005-06-24)
参考文献数
13
被引用文献数
115 122

The effects of different concentrations of individual additions of rare earth metals (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) on eutectic modification in Al-10 mass%Si has been studied by thermal analysis and optical microscopy. According to the twin-plane reentrant edge (TPRE) and impurity induced twinning mechanism, rare earth metals with atomic radii of about 1.65 times larger than that of silicon, are possible candidates for eutectic modification. All of the rare earth elements caused a depression of the eutectic growth temperature, but only Eu modified the eutectic silicon to a fibrous morphology. At best, the remaining elements resulted in only a small degree of refinement of the plate-like silicon. The samples were also quenched during the eutectic arrest to examine the eutectic solidification modes. Many of the rare-earth additions significantly altered the eutectic solidification mode from that of the unmodified alloy. It is concluded that the impurity induced twinning model of modification, based on atomic radius alone, is inadequate and other mechanisms are essential for the modification process. Furthermore, modification and the eutectic nucleation and growth modes are controlled independently of each other.

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昔書いた論文、手当たり次第にレアアース元素14種類をAl-Si合金にぶち込んで微細組織を調べた、完全にバケットケミストリー系だけど、なんと被引用数が170回。下手な鉄砲数打ちゃ当たるの際たるものか。。。https://t.co/QF77GcCLOV

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