著者

和田 竜二 小林 法子 藤居 俊之 尾中 晋 加藤 雅治

出版者

The Japan Institute of Metals

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.71, no.8, pp.587-591, 2007

被引用文献数

2

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Elastic interaction energy between two super-circular inclusions with purely dilatational misfit strains is evaluated. For the calculation, a two dimensional model is used together with linear elasticity for the cubic anisotropy of copper. When two inclusions lie parallel to <100> of the copper crystal, attractive interaction is observed between the inclusions. The maximum of the attractive interaction is realized when the two inclusions exist close to each other. As the inclusion shape becomes circular to square-like, the maximum interaction energy decreases and the distance between the two inclusions to give the maximum increases. Furthermore, the two inclusions are found to be most stable when they have the same size. In addition to the elastic interaction energy, interface energy of the matrix/inclusion interface is also considered. The results show that the two inclusions tend to become the same size even for a situation when the interface energy is much more dominant compared with the elastic interaction energy.<br>

著者

A. Inoue A. Kato T. Zhang S. G. Kim T. Masumoto

出版者

The Japan Institute of Metals

雑誌

Materials Transactions, JIM (ISSN:09161821)

巻号頁・発行日

vol.32, no.7, pp.609-616, 1991 (Released:2007-06-01)

参考文献数

11

被引用文献数

489 510

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A low pressure casting of Mg–Cu–Y melts into copper molds was found to cause amorphous bulks in a cylindrical form. The maximum diameter of the amorphous cylinder (Dc) shows a significant compositional dependence and reaches a maximum value of 4.0 mm for Mg65Cu25Y10. The compositional dependence of the Dc is similar to that for the temperature span of the supercooled liquid region, ΔTx(=Tx−Tg). The similarity is presumably because the alloy with large ΔTx has a high resistance against the nucleation and growth of a crystalline phase resulting from the formation of a disordered structure with a more dense random packing and an optimum bonding states. The compressive proof stress at an elongation of 0.2% (σp) for the Mg80Cu10Y10 cylinder was 822 MPa at room temperature and the fracture occurred along the shear plane. The σp remains unchanged up to 350 K and then decreases significantly with increasing temperature, accompanied by the change in the deformation mode from inhomogeneous to homogeneous type. There is no appreciable difference in the features of mechanical strengths and deformation behavior between the bulk and ribbon samples, indicating the similarity of the disordered structure.

著者

小岩 昌宏

出版者

The Japan Institute of Metals

雑誌

日本金属学会会報 (ISSN:00214426)

巻号頁・発行日

vol.28, no.3, pp.232-232, 1989

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

Hiroshi Sawamura

出版者

The Japan Institute of Metals

雑誌

Transactions of the Japan Institute of Metals (ISSN:00214434)

巻号頁・発行日

vol.13, no.4, pp.225-230, 1972 (Released:2007-06-01)

参考文献数

10

被引用文献数

2 5

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The present investigation has been carried out in order to revise the results of the present author’s previous investigation. For this purpose, the new data about the heat of fusion of most metallic elements have been used.Almost the same results as those of the previous investigation have been obtained. In the present investigation, however, a new fact has been found that the relation in question in metallic elements belonging to CPHex should be considered in two different regions separately, the one being the region of the lower melting temperature and the other the region of the higher melting temperature.The following predictions have been deduced from the present investigation :(1) The structures of the liquid phases in equilibrium with the solid metallic elements (except Al) belonging to FCC at their melting temperatures will be the same with each other, independently of the species of metallic element, because the relation between the entropy of fusion or the heat of fusion of these metallic elements and their melting temperature is represented exactly by a straight line or a smooth curve. The same thing will be said about the metallic elements belonging to other types of space lattice.(2) Though the space lattice of the following metallic elements is considered to be BCC at present, most of them belong probably to FCCZr, V, Ti, Mn, Eu.(3) Though the crystal structure of the following metallic elements is unknown at present, they belong probably to FCC or CPHexPa, Ac, U, Sm, Pm, Nd, Pr, La, Ce, Ra.

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.