著者

花田 修治 渡辺 貞夫 佐藤 敬 和泉 修

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.45, no.12, pp.1279-1284, 1981 (Released:2008-04-04)

参考文献数

30

被引用文献数

5 8

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Magnetic heads made of Sendust alloy head cores (standard chemical composition: Fe-9.6 wt%Si-5.4 wt%Al) are known to have superior magnetic properties and wear resistance. The cores are usually made by mechanical working, such as slicing and grinding since the alloy is so hard and brittle that it has been believed to be difficult to make head cores by plastic deformation. In the present work, plastic deformability of the alloys was investigated by compressive tests on Sendust single crystals at temperatures between room temperature and 1173 K and various strain rates. Main results are summarized as follows.The operative slip systems are {110}〈111〉 and {112}〈111〉 depending on compressive axis. Therefore, the von Mises criterion for a polycrystalline material to deform plastically by slip within grains is satisfied, indicating that the brittleness of Sendust alloys cannot be explained by the number of independent slip modes available. At room temperature the stress-strain curve exhibits three stages in a similar manner to Fe3Al and Fe3Si with DO3 structure.Above the temperature where yield stress decreases abruptly, the steady state deformation takes place. Under the condition of the steady state deformation, the strain rate is represented by the relationship of \dotε=Bσnexp(−Q⁄kT), where n=4.6 and Q=540 kJ/mol. These results suggest that even a polycrystalline material of Sendust alloy may be deformable under the suitable conditions.

著者

清水 謙一

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.37, no.8, pp.655-658, 1998-08-20 (Released:2011-08-11)

参考文献数

27

著者

星 恵理子 北田 正弘

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.67, no.7, pp.336-341, 2003 (Released:2008-04-24)

参考文献数

12

被引用文献数

4

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The effects of Cu-containing pigments on degradation of Japanese paper have been investigated. A hand-coloured wood-block print of the late Edo era is used as a naturally aged specimen. To clarify the degradation mechanism, sheets of modern Japanese paper painted with powdered malachite are aged in an environment of 353.15 K(80°C), 65%RH. Pigments are examined with XRD. Degradation of the paper is examined with a three-dimensional fluorescence spectrometer. Cu content in the specimen is measured by ICP-AES and EDS. The Cu concentrations of the cross-sections of naturally aged specimen decrease with increasing depth. In addition, the Cu concentrations at the same depth of the artificially aged paper increase with aging. These results show that the Cu species diffuse from the right to the wrong side of the paper. Although the green pigment of wood-block print contains Cu species and As species, only the Cu species has been detected in the fiber of the degraded part of the paper. The degree of degradation of the accelerated sample painted with malachite becomes higher than that of the unpainted sample. Therefore Cu is the main species that participates in the degradation of paper. The fluorescence intensity of the papers painted with malachite decreased with increasing aging time. This result shows that diffused Cu ions make impurity levels in the band gap of cellulose.

著者

加藤 雅治

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.47, no.5, pp.256-261, 2008-05-01 (Released:2011-08-11)

参考文献数

7

被引用文献数

1

著者

齋藤 幸夫

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.49, no.7, pp.327-331, 2010 (Released:2012-11-15)

参考文献数

8

著者

近藤 淳

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.44, no.10, pp.824-831, 2005-10-20 (Released:2011-08-11)

参考文献数

6

著者

川副 博司

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.39, no.2, pp.114-118, 2000-02-20 (Released:2011-08-11)

参考文献数

7

著者

高橋 平七郎 野田 哲二

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.34, no.8, pp.966-968, 1995-08-20 (Released:2011-08-11)

参考文献数

13

著者

滝沢 博胤 林田 千絵 林 大和

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.45, no.8, pp.577-580, 2006-08-20 (Released:2011-08-11)

参考文献数

11

被引用文献数

4 4

著者

谷川 智之

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.58, no.3, pp.144-149, 2019-03-01 (Released:2019-03-01)

参考文献数

25

被引用文献数

1

著者

田村 元紀

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.75, no.1, pp.1-4, 2011 (Released:2011-01-01)

参考文献数

6

被引用文献数

1 1

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Functionality of element iron is reviewed from a view point of evolving earth and life. Energy conversion of oxidation-reduction reaction of iron (Fe2+/Fe3+) is important for life of some bacteria and this has been continued for more than 10 billion years. Furthermore, iron has been saving life on earth by geomagnetic properties by positioning on earth's core. This most abundant metal element iron has a lot of unique properties that can be not substituted by other elements. We have been utilizing iron-carbon materials as many kinds of tools because of those widely-controllable mechanical properties. Some of magnetic, mechanical, chemical and electric properties are well known but there may be a lot of unknown properties of element iron and iron materials. Further interdiciplinary studies are suggested.

著者

小林 宙 庄司 浩史 浅野 聡 今村 正樹

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.80, no.11, pp.713-718, 2016 (Released:2016-10-25)

参考文献数

8

被引用文献数

1 3

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MCLE (Matte Chlorine Leach and Electro-winning) process developed by Sumitomo Metal Mining Co., LTD. is well known as a unique commercial nickel refining process with high nickel recovery ratio. Two types of nickel sulfide, nickel matte and mixed sulfide (MS: mixture sulfide of nickel and cobalt), are treated in the MCLE process, and the leaching rate difference for each materials become obvious in this process. Bench scale tests had been carried out and leaching rates and activation energies of chlorine leaching reactions were identified. The nickel leaching rate of MS in chlorine leaching reaction is 60% smaller than that of nickel matte.  The nickel leaching rate difference between nickel matte and MS in chlorine leaching reaction is derived from their reaction free energy difference. The determinants of the chlorine leaching reaction rate of nickel matte and MS are respectively a chemical reaction rate and elements diffusion ratio on their surface.

著者

山口 智彦 宮田 貴章

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.42, no.6, pp.448-452, 2003-06-20 (Released:2011-08-11)

被引用文献数

1 1

著者

宮野 公樹

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.60, no.10, pp.615-619, 2021-10-01 (Released:2021-10-01)

参考文献数

14

著者

船川 義正

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.81, no.10, pp.447-457, 2017-10-01 (Released:2017-09-25)

参考文献数

56

被引用文献数

1 1

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The interface-precipitation has been observed as row carbide arrange since 1960’s. Whereas the interface-precipitated carbides in steels were NbC, TiC, VC and Cr23C6 in the early stage, composite TiC containing Mo and W has been also become to observe recently. Several kinds of the mechanism of the interface-precipitation have been suggested and ledge mechanism and bowing mechanism which combined interface barging and carbide precipitation are widely accepted since the mechanisms successfully explained a large amount of the experimental results. Fine interface-precipitates in low carbon steel realize high strength steel sheets, plates, bars and rods which are non-quenched and tempered. Especially, in sheet products, in which fine carbides can be easily generated, ferritic steel of 1180 MPa in tensile strength is successfully obtained by dispersing fine carbides with the diameter of several nano-meters.

著者

山田 淳夫 小林 陽

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.46, no.9, pp.607-613, 2007-09-01 (Released:2011-08-11)

参考文献数

47

著者

小岩 昌宏

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.38, no.2, pp.144-147, 1999-02-20 (Released:2011-08-11)

参考文献数

12

著者

高橋 裕 山崎 健

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.67, no.3, pp.116-121, 2003 (Released:2008-04-24)

参考文献数

10

被引用文献数

1 1

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CO2 was absorbed into C60-C70 binary solids at room temperature using a commercially available autoclave. The solids were then immersed in liquid CO2 for 24 h at a gas pressure of 5 to 6 MPa, and the degree of CO2 storage was evaluated by infrared (IR) spectroscopy and X-ray diffraction (XRD). CO2 was detected in pure C60 by IR measurement, and the stoichiometry was estimated to be C60(CO2)0.34 based on the increase in the lattice parameter. Although no trace of CO2 storage was detected for pure C70, the addition of C70 to C60 at a mole fraction of up to 0.16 did not appreciably degrade the storage capacity of CO2 from that in pure C60. The stability of CO2 trapped in solid fullerenes is explained in terms of geometrical considerations based on hard-sphere packing at octahedral sites.

著者

菊山 紀彦

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.37, no.5, pp.356-360, 1998-05-20 (Released:2011-08-11)

著者

沼田 泰子 首藤 文榮 野村 直之 千葉 晶彦

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.70, no.2, pp.142-145, 2006 (Released:2006-02-24)

参考文献数

9

被引用文献数

2 1

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We evaluated the biocompatibility of cobalt-29 chromium-6 molybdenum alloy by analyzing disorders of the membranes of cells of the murine fibroblast L929 line. L929 cells were incubated with 10% fetal bovine serum at 37°C for 7 days in Eagle's minimum essential medium in the presence of either an extract of this alloy, or titanium extract, or vanadium ions. No morphological changes in the cells were observed in medium containing cobalt-29 chromium-6 molybdenum alloy extract or titanium extract, but a remarkable change was observed in the medium containing vanadium ion as a positive control. From the enzyme activity of the culture supernatant we determined the amount of lactate dehydrogenase (LDH) that leaked through the cell membranes. The amount that leaked from cells incubated in the presence of either of the metal extracts or vanadium ion decreased on day 1 and then increased with incubation time from day 2 onward. There was only a small increase in leakage in the media containing the metal extracts but a marked increase in the medium containing vanadium ion. These results indicate that the cell membrane remained nearly unaffected by Co-29Cr-6Mo alloy.