著者

松原 三徳 杉山 圭司

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.6, no.9, pp.481-487, 1942 (Released:2008-11-13)

参考文献数

10

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The effects of, concentration of nitric acid and temperature were examined on hard rolled aluminium (Purity=99.70%) by dip method corrosion test. The corrosion test was carried out in 5_??_98% HNO3 at 30_??_70° by measuring the weight loss for 10 hours, and the corrosion rate was expressed as g/m2hr. The results obtained were as follows. (1) In 98% HNO3; the resistivity is excellent up to 70° (2) In 94% HNO3; the resistivity is excellent at 30°, and even at 50_??_70° the resistivity is good. (3) in 92% HNO3; the resistivity is good at 30°. (4) In bellow 90% HNO3; the resistivity is rot good even at 30° and is minimum in. 30% HNO3. II. The effect of purity of aluminium was examined on virgin ingot (Purity=99.980, 99.74, 99.60, 99.38, 99.18 and 98.40%) by dip method corrosion test. The corrosion test was carried out in 30%, 90% HNO3 at 30° by measuring the weight loss for 10 hours, and the corrosion rate was expressed as g/m2hr. The results. obtained were as follows. (1) In cone. HNO3 the effect of purity of aluminium is very small. (2) In dil HNO3, the effect is small as far as purity of aluminium is above 9938%.

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

増本 量 山本 達治

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:03694186)

巻号頁・発行日

vol.1, no.3, pp.127-135, 1937-07-20 (Released:2008-11-13)

参考文献数

4

被引用文献数

40 49

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The magnetic and electric properties of the binary and ternary alloys involving iron, silicon and aluminium have been measured, and the relations of these properties to their respective concentrations have also been investigated. Those alloys containing 6_??_11 per cent of Si, 4_??_8 per cent of Al show specially excellent magnetic properties and their representative alloy has been shown to contain 9.62 per cent of Si, 5.38 per cent of Al. Some of its physical constants are as follows : the initial permeability, 35100; the maximum permeability, 117500; the magnetic hysteresis-loss, 28 egrs/cm3 per cycle: the coercive force, 0.022 oersteds; and the specific electric resistance, 81 microhms /cm3 at 20°.

著者

鈴木 益廣

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:03694186)

巻号頁・発行日

vol.3, no.2, pp.A86-A92, 1939 (Released:2008-11-13)

参考文献数

2

著者

岩瀬 慶三

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:03694186)

巻号頁・発行日

vol.6, no.11, pp.A411-A414, 1942 (Released:2008-11-13)

参考文献数

2

著者

伊藤 尚

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:03694186)

巻号頁・発行日

vol.6, no.12, pp.A443-A446, 1942 (Released:2008-11-13)

著者

西村 秀雄

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:03694186)

巻号頁・発行日

vol.1, no.1, pp.8-18, 1937-05-20 (Released:2008-11-13)

参考文献数

8

被引用文献数

4 1

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The constitutions of the Al-rich alloys containing Cu and Mg were investigated by means of thermal analysis and microscopic examination. ation. From various constitutional sections taken as constant in Al-content or taken through the Al axis, the following conclusions were drawn: (1). In a range of Cu 50% and Mg 40%, the primary separations are (Al), CuAl2, S, T, β and X, where S and T being in equilibrium with (Al), denote ternary compounds Al13Cu7Mg8 and Al5CuMg4 respectively, β is an intermediate phase existing between Al and Mg and X is an unknown phase not determined in this investigation. (2). The ternary compounds Al13Cu7Mg8. and Al5CuMg4 were found to exist. (3). The uni-variant reaction lines were found to be: -Liq_??_(Al)+CuAl2, Liq_??_(Al)+S, Liq_??_(Al)+T, Liq_??_(Al)+β, Liq_??_CuAl2+S, Liq+T_??_S, Liq+X_??_S, Liq+X_??_T, Liq_??_T+β, and the in-variant points were; Liq (Al)+CuAl2+S, at 500°, Liq_??_(Al)+T+β, at 447°, Liq+S_??_T+(Al), at 465°, and Liq+X_??_S+T, at 525°. (4). It is concluded that the natural ageing of Duralumin and 24S-type Super-Duralumin is mainly concerned with the solid solubilily change of S-compound and CuAl2 or that of S-compound in Aluminium.

著者

村上 武次郎

出版者

社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:03694186)

巻号頁・発行日

vol.6, no.6, pp.A218-A225, 1942 (Released:2008-11-13)

参考文献数

46

著者

綿谷 知久 吉川 雅明 田中 俊 小島 広光

出版者

公益社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.67, no.11, pp.643-646, 2003-11-20

参考文献数

7

被引用文献数

2 1

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In order to improve the wettability and storage stability of Sn-Zn system Pb-free cream solders, minute amounts of Mg, Al, Cu, Pb, and Sb were added to the Sn-8Zn-1Bi Pb-free alloy, and its properties were evaluated.<BR>The results obtained are:<BR>&mdash;Mg and Al additions were effective in improving wettability,<BR>&mdash;the addition of Al increased the amount of unmelted solder, and<BR>&mdash;the addition of Mg caused degradation of storage stability due to an increase in solder viscosity.<BR>Addition of the other elements did not improve the wettability. The combination of Mg and Al additions was found to improve wettability and storage stability, leading to stable wettability. Results of AES surface analyses showed that the solder with Mg and Al additives forms an Mg-Al-composite oxide film in the surface layer, which suppresses Zn oxidation observed in non-added solders. The suppression of Zn oxidation and the formation of a thin Mg-Al-composite film contribute to the wettability and storage stability improvements.

著者

杉岡 奈穂子 北田 正弘 西嶋 雅彦

出版者

公益社団法人 日本金属学会

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.77, no.5, pp.185-191, 2013-05-01

参考文献数

15

被引用文献数

2

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&nbsp;&nbsp;The metallurgical microstructure and mechanical properties of the spear blade manufactured in the Edo period have been investigated. The purpose of this work is to obtain metallographic data of the spear blade, and to clarify the manufacturing technique of the spear blade. The specimen examined was estimated to have been made from the end of the Muromachi period to the Edo period and has the signature of <i>Shinano-no-Kami Minamoto Takamichi</i>. The spear is 31 cm in length and 10.7 mm in maximum width. The metallurgical microstructure and nonmetallic inclusions of the spear blade are observed using an optical microscope. The carbon concentration is determined by chemical analysis. To evaluate the hardness, micro Vickers hardness (<i>H</i>_mv) is used. The microstructure is observed using an optical microscope and a scanning electron microscope (SEM). The concentration of nonmetallic inclusions is obtained by electron dispersive X-ray analysis (EDS).<br> &nbsp;&nbsp; A cross-sectional image of the spear after chemical etching shows a metal flow pattern formed by deformation, possibly created by hammering. The striped structure of layers of two types of steel containing different carbon contents stacked on top of each other was observed. The bright areas after etching corresponded to the edges and ridges of the spear, which were cooled rapidly, forming the martensite structure. The other dark areas consist of pearlite and &alpha;-Fe (ferrite) grains. Optical micrographs of near-edge areas contain pearlite and martensite grains, and core areas contain pearlite and &alpha;-Fe grains. The nonmetallic inclusions in the core steel consist of a few metal oxide particles and a glass matrix. There are Fe-Ti oxide grains in the glass matrix, and an unknown oxide particle adhering on the Fe-Ti oxide grain surface was also observed.<br>

著者

田中 眞奈子 北田 正弘

出版者

日本金属学会

雑誌

日本金屬學會誌 (ISSN:00214876)

巻号頁・発行日

vol.76, no.8, pp.489-495, 2012-08-01

参考文献数

15