巻号一覧
24 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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石田 四郎, 中村 〓, 大塚 立躬, 入谷 隆1974 年 24 巻 4 号 p. 135-140
発行日: 1974/04/30
公開日: 2008/10/30
ジャーナル フリーIn this study, coexisting effects of Na2SiO3 and Na3PO4 upon the artificial water LSW1 (capable of generating pit on aluminium immersed in waters) found by the authors were investigated. Related to the permanent hard water, effect of SO42- ion upon LSW1 was studied, and very complicated relations were found. Related to the temporary hard water, effect of Ca(HCO3)2 upon LSW1 was studied. Coexisting effect of the permanent (CaSO4) and the temporary [Ca(HCO3)2] waters was studied.
By variations of coexisting ratio of SiO32-(or PO4-3) and Ca(HCO3)2, pH of the natural waters becomes either alkali or acid. And in each pH side there existed a unique pitting characteristic.抄録全体を表示PDF形式でダウンロード (687K) -
阿部 隆, 相沢 浩司, 内山 利光, 礒山 永三1974 年 24 巻 4 号 p. 141-157
発行日: 1974/04/30
公開日: 2008/10/30
ジャーナル フリーThe behavior of oxide films and oil existing on aluminum surfaces, heat treated in an inert gas atmosphere, and their effect on the adhesion of polyethylene to aluminum were investigated. The experimental results were compared with those obtained in aluminum heat treated in the air. The results obtained were as follows:
(1) The growth rate of oxide films in the air strongly depended on the temperature and the film grew more than 100 Å in thickness at 500°C for 5hr. However, the same heating condition produced only 50 Å thick films in the inert atmosphere.
(2) When heating was done in the air, the fluidity of oil decreased and the fixed oil layer was found as heat treatment proceeded. However, the heat treatment in the inert atmosphere resulted in the slight change of oil properties and produced a small amount of the fixed oil layer. Further, the oil removal from the surface did not occur rapidly in the inert atmosphere.
(3) The heat treatment in the air accompanied the rapid oxide film growth and the considerable oil alteration. This resulted in a significant decrease in the peeling strength of the polyethylene film and shifted the peeling place from the polyethylene side to the oxide films side or the solid oil side. Contrary to this, the heating in the inert atmosphere did not accompany the strong oxide growth and the considerable oil alteration. Thus, the peeling strength, mainly associated with the cohesive failure at the polyethylene side, did not decrease rapidly and the shift of the peeling place was not noted.抄録全体を表示PDF形式でダウンロード (4119K) -
福井 利安1974 年 24 巻 4 号 p. 158-167
発行日: 1974/04/30
公開日: 2008/10/30
ジャーナル フリーEffect of such transition elements as Mn, Cr, Zr, Ti, V and Fe on notch toughness of artificially aged Al-Zn-Mg alloy plates and their welds was studied by measuring the notch-tensile and yield strength ratio and the Charpy impact value. Mn, Cr, Zr and Ti increased the strength and notch toughness of high purity alloy plates, possibly because these elements produced the fine precipitates and refined the recrystallized grains. However Fe decreased the notch toughness, although it increased the strength by inducing fine grains. It was suggested that this was due to the incoherent compounds, formed on casting, which remained undissolved during homogenizing treatment.
The tendency of the strength increase of commercial Al-Zn-Mg alloy plates by the addition of Mn, Zr, Ti, Ni and Co was smaller than that of high purity alloys. Further, these elements hardly improved the ductility and toughness.
Because the transition elements were forced to dissolve in the matrix by rapid solidification during welding, the effect of transition elements on the welds was simple. Some elements slightly increased the notch toughness of the high purity alloys, while they did not improve that of the commercial alloys. Grain refinement by the Zr and Ti addition hardly improved the notch toughness of the welds.抄録全体を表示PDF形式でダウンロード (3221K) -
鈴木 寿, 菅野 幹宏, 荒木 一郎1974 年 24 巻 4 号 p. 168-174
発行日: 1974/04/30
公開日: 2008/10/30
ジャーナル フリーFollowing the previous study that showed the occurrence of the abrupt change in the low temperature aging phenomena in Al-Zn-Mg alloys by a small amount of Mg which affected the number of phases, the present study was conducted to see the similar change in the high temperature aging in Al-5at%Zn-Mg alloys. After solution treatment at 470°C, specimens were quenched into iced water and aged at 100°C and 150°C. Aging was followed by hardness, electrical resistivity and calorimetric measurement and transmission electron microscopy. As in the low temperature aging, the marked difference in the aging phenomena between the two and three phase alloys was found to exist; the two phase alloy did not develop age hardening and showed no maximum in resistivitytime curves, while the three phase alloy developed age hardening and showed a maximum in a resistivity curve.抄録全体を表示PDF形式でダウンロード (1381K) -
鈴木 寿, 浅見 重則, 菅野 幹宏1974 年 24 巻 4 号 p. 175-179
発行日: 1974/04/30
公開日: 2008/10/30
ジャーナル フリーAging phenomena in Al-Zn-Mg alloys, ranging from (α+η) to (α+κ) phase regions, with 5 at% of Zn plus Mg were investiga ed by means of hardness, electrical resistivity and specific heat measurement and transmission electron microscopy. After solution treatment at 470°C for 1hr, specimens were quenched into iced water and aged at various temperatures between 50°C and 150°C. As the ratio, Zn/Mg, increased, the initial aging rate increased. However, at the same time, the distribution of G. P. zones and intermediate phases became coarser and the age-hardenability decreased. These observations were discussed in terms of the characteristcs of precipitates, present in the phase regions, and the solute-supersaturation which decreased with the increasing Zn/Mg ratio. The present study indicated, with the results reported in the previous study, that aging behavior of the (α+T) to (α+κ) type Al-Zn-Mg alloys changed continuously as the Zn/Mg ratio inc1eased, except in the (α+κ)type alloy, and the most excellent mechanical property was considered to be obtained by aging the Zn rich (α+T) type alloy at 125°C to 150°C.抄録全体を表示PDF形式でダウンロード (1226K) -
福井 利安1974 年 24 巻 4 号 p. 180-192
発行日: 1974/04/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (2608K)
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