著者

Nobuyuki Nishiyama Akihisa Inoue

出版者

The Japan Institute of Metals

雑誌

Materials Transactions, JIM (ISSN:09161821)

巻号頁・発行日

vol.38, no.5, pp.464-472, 1997 (Released:2007-06-01)

参考文献数

34

被引用文献数

108 111

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A Pd40Cu30Ni10P20 alloy subjected to B2O3 flux treatment was found to have a low critical cooling rate (Rc) of 0.100 K/s for glass formation and a large sample thickness (tmax) of 72 mm by the water quenching process. The Rc and tmax exceed largely those (Rc=1.57 K/s, tmax=40 mm) for the Pd–Cu–Ni–P alloy without the flux treatment. It is concluded that the flux treatment causes a significant increase in the thermal stability of the supercooled liquid. The glass transition temperature (Tg) remains unchanged in the fluxed state, but the crystallization temperature (Tx) increases by 7 K, leading to the extension of the supercooled liquid region defined by ΔTx(=Tx−Tg) to 98 K which is larger than that (91 K) for the non-fluxed sample. The decrease in Rc and the increases in tmax and ΔTx for the fluxed sample are presumably due to the suppression of heterogeneous nucleation for crystallization resulting from the increase in the degree of cleanness of the molten alloy. Besides, the Pd–Cu–Ni–P amorphous alloy has lower Rc and melting temperature (Tm) and larger tmax, ΔTx and Tg⁄Tm values, as compared with those for Pd40Ni40P20 alloy. The larger glass-forming ability for the Pd–Cu–Ni–P alloy is presumably due to the increase in the degree of the satisfaction of the three empirical rules for the achievement of larger glass-forming ability resulting from the more systematic change in atomic size in the order Pd>>Cu>Ni>>P and the generation of Cu–Pd and Cu–P atomic pairs with negative heats of mixing. There is no appreciable difference in the Tg, Tx and crystallization behavior between the cast 72 mmφ amorphous ingot and melt-spun amorphous ribbon. The finding of the fluxed Pd40Cu30Ni10P20 alloy with the lower Rc and larger tmax values is promising for the future development of bulk amorphous alloys.

著者

Baolong Shen Akihisa Inoue

出版者

一般社団法人 粉体粉末冶金協会

雑誌

粉体および粉末冶金 (ISSN:05328799)

巻号頁・発行日

vol.58, no.6, pp.403, 2011 (Released:2011-07-15)

被引用文献数

1 1

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掲載論文の取り消しについて「粉体および粉末冶金」編集委員会, 委員長 吉村 一良「粉体および粉末冶金」Vol.50, No.9に掲載の下記論文1について,先に投稿された下記論文2の内容と著しく重複していることが判明しました.「粉体および粉末冶金」編集委員会では,本件に関し,粉体および粉末冶金投稿規程及び研究倫理上の理由によって,当該論文の掲載を取り消すことにいたしました.この処置は,論文1が論文2の審査中に投稿されたものであり,また論文1中に論文2の引用もなかったため,論文内容の重複について審査段階で認識することができなかったための処置であります.○論文1:Fe-Based Glassy Magnetic Cores Prepared by Spark Plasma Sintering Glassy Alloy Powders, Baolong Shen and Akihisa Inoue,粉体および粉末冶金, Vol.50, No.9 (2003) 680-686. ( Received May 2, 2003 ) ○論文2:Fabrication of large-size Fe-based glassy cores with good soft magnetic properties by spark plasma sintering, Baolong Shen and A. Inoue, Journal of Materials Research, Vol.18, No.9 (2003) 2115-2121. ( Received 27 April, 2003, accepted 10 June, 2003 ).

著者

Eiichiro Matsubara Shigeo Sato Muneyuki Imafuku Takahiro Nakamura Hisato Koshiba Akihisa Inoue Yoshio Waseda

出版者

The Japan Institute of Metals

雑誌

Materials Transactions, JIM (ISSN:09161821)

巻号頁・発行日

vol.41, no.11, pp.1379-1384, 2000 (Released:2007-06-01)

参考文献数

15

被引用文献数

13 14

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This paper has been retracted by the Editorial Committee with the first author’s agreement due to substantial overlap with the following paper previously received in another journal. Mater. Sci. Eng. A 312 (2001) 136-144 Structural study of Amorphous Fe70M10B20 (M=Zr, Nb and Cr) alloys by X-ray diffraction E. Matsubara, S. Sato, M. Imafuku, T. Nakamura, H. Koshiba, A. Inoue, Y. Waseda (Received on May 8, 2000) And thus, it shall not be regarded as an original paper. Although this paper was submitted to the Special Issue on Bulk Amorphous, Nano-Crystalline and Nano-Quasicrystalline Alloys by the first author without understanding the bylaws of Materials Transactions, JIM, it was not an appropriate deed. The first author acknowledges the substantial overlap and his apologies have been accepted accordingly. The notice has been issued to all the authors to pay more careful attention in submitting papers.