巻号一覧
7 巻, 6 号
選択された号の論文の12件中1～12を表示しています
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川島 浪夫1957 年 7 巻 6 号 p. 3-4
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (241K) -
純アルミニウムの鋳造組織におよぼすチタンの影響中尾 善信1957 年 7 巻 6 号 p. 5-15
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーThe effects of titanium on the cast structure of aluminium of several purities which were solidified upwared under various cooling conditions, were studied. It was found that the columnar structure of super-pure aluminium (99.99%) was refined to a granular one by the addition of 0.15% titanium, same result was obtained with commercially pure aluminium, with 0.07% titanium. Such granular structure was produced under any cooling conditions, whether the rate of solidification was fast or slow.
Super-heating the melt containing titanium at several temperatures for several periods caused the granular structure to change into columnar one. The change was pretty fast at 900°C, but not so fast at 720°C.
"Fiederkristall" appeared in some specimens . This crystal seemed to appear under the conditions that (i) the alloy contained some titanium and iron, (ii) the melt was not disturbed, and (iii) the rate of solidification was fast.
Similar experiment was performed for large specimens of 5kg, and the relation between the cooling condition and the cast structure was also examined.抄録全体を表示PDF形式でダウンロード (4288K) -
三島 良績, 平野 四蔵, 高橋 直明, 小鹿原 猪一1957 年 7 巻 6 号 p. 16-20
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーAs hydrogen included in aluminium has long been considered to have substancial influence on the defect of aluminium; as for pin holes in castings or blisters in sheets, many studies have been carried out and several proposals to find out the route throuth which hydrogen comes into aluminium have been made. No exact confirmation, however, has been done because there has been no reliable way to trace the behaviour of hydrogen directly.
The authors method, as described in this report, is to use deuterium as a tracer and slightly enriched water, containing less than 1 atomic percent deuterium was used to give moisture. The vacuum-extracted gas from the ingot thus prepared was analized by mass spectrometer and the ratio D/H was compared with that in natural water (0.0147±0.0001 atomic percent). The results of the experiments on commercial pure aluminium and aluminium -7% magnesium alloy castings under six conditions of hydrogen introduction have been reported here, as summarized in Table 1. It is not sufficiently quantitative yet, but certain qualitative comparisons can be made among the several routes considered, which will serve as an aid to the foundry practice of aluminium.抄録全体を表示PDF形式でダウンロード (1016K) -
麻田 宏, 小池 吉蔵, 森本 三郎1957 年 7 巻 6 号 p. 21-28
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーEffects of hot drawing on the recrystallization temperature and the mechanical properties of both 17S and 53S aluminium bars extruded or cold-drawn and subsequently annealed were investigated.
The results were as follows:
In case of the extruded bars, the recrystallization temperature of the hot-drawn ones did not descend from that of the original recrystallization temperature of the starting extruded bars. Therefore, the high strengthen properties which were produced by extrusion were maintained during hot drawing, then it will be able to produce the high strengthen materials by hot drawing as well as extrusion.
In case of the cold drawn and subsequently annealed bar, it was recognized that the tendency of recrystallization temperature rather elevated than descended.
The strength of the hot-drawn materials are affected by the size of the substructures which consist of the net-work of small angle boundaries produced by hot working and heat treatment.抄録全体を表示PDF形式でダウンロード (1721K) -
潮田 豊治, 吉村 修, 増山 章一郎1957 年 7 巻 6 号 p. 29-33
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーIt is generally recognized that small amount of beryllium gives various beneficial effects to sand cast materials of aluminium-magnesium alloys.
To acquire the industrial effect of small amount of beryllium to aluminium-magnesium alloy cast slab for wrought materials and its sheets, the authors tested the following problems.
1) Oxidation loss at melting operation.
2) Casting crack and flatness of slab surface.
3) Grain size.
4) Mechanical properties.
5) Corrosion resistance.
6) Black film formed during heating operation.
The results are as follows;
Adding of 0.005% beryllium to aluminium-magnesium alloy exceedingly decreases casting crack and surface of continuously cast slab becomes considerably flat and also the black spot on slab surface disappeares.
Adding beryllium in these amounts is not industrially effective to mechanical properties and corrosion resistance.
On the other hand, oxidation loss at remelting operation and black film formed during heating of slab or sheet is considerably, prevented by beryllium.抄録全体を表示PDF形式でダウンロード (645K) -
Reflectal合金の深絞加工の耳発生について中村 雄造, 奥川 卓爾, 福地 登1957 年 7 巻 6 号 p. 34-39
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーThe investigation of the directionality of earing of reflectal alloy sheets (99.99%Al-2%Mg-0.8%Mg) in deep drawing test was carried out, and the following results were obtained:
1) Earing of the sheet annealed at the temperature, just prior to recrystn is the lowest, and the higher final annealing temperature is, the higher is the ear.
2) Earings of 99.99%Al-2%Mg and 99.99%Al-0.8%Mg alloy sheets, anealed after 40% and 60% cold reduction respectively, are the lowest, and these reductions correspond to the point at which the recrystallization temperatures become constant.
3) Cross rolling proves to have a little effect on earing as far as this experiment is con- cerned.
4) The sheet having 45° ear has preferential crystal orientation close to {110} <112>, {100} <100>, that having 0° or 90° ear {110} <001>, {100} <001>, and that having low ear random orientations.抄録全体を表示PDF形式でダウンロード (1844K) -
及川 弘, 西田 恵三, 幸田 成康1957 年 7 巻 6 号 p. 40-47,55
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーAs a fundamental study on lining materials for iron pots for melting aluminium, commercial products such as silica (41%), alumina (40%) or magnesia (25%) powder were mixed with water glass (JIS No. 3) respectively, lined on steel plates, and then dried at 30°C in a constant temperature drying oven, with 40-45% relative humidity. Decrease of both weight and thickness of the samples during drying were measured by means of needle penetration.
The effect of adding Na2CO3•10H2O or NaHCO3 powder on the lining properties, were also Studied and it was found that the lining of alumina mixed with 2% NaHCO3. powder hardened most speedily among other samples.
Next, these pieces were dipped in molten aluminium at 800°C for 5 hours, and then their sections were observed microscopically. As a result, it was concluded that the lining mentioned above (alumina with 2% NaHCO3) was the best in many points, the reason of which might be attributable to many pores produced in the alumina lining by adding NaHCO3 powder.抄録全体を表示PDF形式でダウンロード (1099K) -
高マグネシウム域におけるケイ素の影響中村 康治1957 年 7 巻 6 号 p. 48-55
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーThe author has reported the conspicuous effects of silicon on aluminium-magnesium casting alloys, and intend to clarify its effects in the regiion of higher magnesium content of the alloy in the persent paper. The invenstigation concerned with Al3Mg2-Mg2Si quasi-binary system, solubility curve of magnesium in aluminium with various amounts of silicon, and the effects of silicon on the velocity of solutionizing of magnesium in aluminium, and showed the following facts.
Al3Mg2-Mg2Si system is a eutectic-type, and therefore it seems unnecessary to consider other phase than Al, Al3Mg2, and Mg2Si in the aluminium-magnesium alloy with silicon. Silicon shifts the solubility curve towards higher magnesium side compensating the magnesium content combined with silicon as Mg2Si, and moreover retard the solutionizing of magnesium into aluminium remarkably.抄録全体を表示PDF形式でダウンロード (1460K) -
椙山 正孝, 鈴木 寿1957 年 7 巻 6 号 p. 56-63
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーBasic investigations on sintered aluminium products from different particle sizes of both commercially prepared flaky powders and experimentally produced powders by atomization process were carried out.
At first, various properties such as density, tensile and heat-resisting properties and hardness of sintered. compacts, as the function of molding pressure, sintering temperature and time were mainly described in respect of particle sizes of both powders particularly-200 meshes.
Next, as the results of this experiment, attending to the obtainability of high sintered density from atomized powders, some properties as above mentioned were also studied as to the sintered and wrought products.抄録全体を表示PDF形式でダウンロード (1448K) -
潮田 豊治, 吉村 修, 阿部 隆1957 年 7 巻 6 号 p. 64-67,33
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーUsing half wave rectification obtained from selemium rectifier, anodic oxidation of aluminium by oxalic acid process is investigated as follows:
1) Anodic corrosion and its protection of negative current.
2) Observation of wave forms of electric current by oscillograph.
3) Properties of oxide film anodized under various conditions of temperature and concentration of electrolyte.
Results are summarized as follows:
(1) In 0.5 and 3.5% concentration of electrolyte, anodic corrosion occurs when only half wave rectification is used. The lower the concentration of electrolyte, the higher the negative current necessary to protect its corrosion. It is about 0.1-0.2A/dm2 (root mean square value) for 1A/dm2 positive current (mean value). With an increase of negative current and a decrease of concentration of electrolyte, specific corrosion resistance becomes better. But specific abrasion resistance slightly falls with an increase of negative current.
(2) While the anodic oxidation is normally proceeding, distortion of wave form in oscillograph is observed, but this distortion disappears when anodic corrosion begins to occur.
(3) As a general tendency of the effect of temperature and concentration of electrolyte on the properties of oxide film anodized under constant positive and negative current, specific corrosion resistance becomes better with lower concentration and higher temperature, but specific abrasion resistance becomes better with lower temperature.抄録全体を表示PDF形式でダウンロード (583K) -
三島 良績, 高橋 直明1957 年 7 巻 6 号 p. 68-72
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーAs the first step to improve Magnox series alloys currently used in Calder Hall power reactor in England as well as to develop better magnesium alloys to be used for canning materials in CO2 gas-colled reactor, the following experiments have been carried out:
By preparing, in the authors own laboratory Magnox E alloy, as well as several Mg-Al-Ca-Be alloys of different amount of calcium and berylium, but less than those in Magnox E, the effect of the two elements on the properties of the alloys have been confirmed. The two elements improved strength and oxidation resistance; calcium being more effective in strengthening as seen in Fig. 1.
Substitution of calcium with other element of lower thermal neutron absorption cross section (less than 1 barn) was the subject of next concern, as calcium is not recommended because of welding crack problem. Work hardening characteristic and annealing curves shown in Fig. 2 and 3, respectively have been compared and little differences has been found in the former among the candidate alloys without calcium. Considering from the annealing curves, the high temperature strength at the working temperature of reactor, 752°F (400°C), may be improved by the addition of zirconium, zinc or bismuth, about which further experiments are being contemplated.抄録全体を表示PDF形式でダウンロード (617K) -
諸住 正太郎, 武内 朋之1957 年 7 巻 6 号 p. 73-81,15
発行日: 1957/11/30
公開日: 2008/10/30
ジャーナル フリーThis paper deals with the solution-treatment of Mg-Zn-Zr alloy. Microstructures examination shows that solution-treatments of cast Mg-5.2%Zn-0.6%Zr alloy below 500°C precipitate Zr about the center of grain where contains Zr richly.
Electrical resitivity measured under the very slow-heating and cooling condition on the Mg-Zn-Zr alloys of various composition shows that the effect of Zn is remarkable in the lower temperature range while that of Zr is marked in the higher temperature range. Another electrical resistivity measurement under isothermal condition shows that solute. content of Zr after solution-treatment is decreased by heating at the lower (350-400°C) temperature, and these specimens have similar aging curve of electrical resistivity as Mg-Zn binary alloy.
It is shown that the effect of heating temperature for solution-treatment of Mg-5.2%Zn-0.6%Zr on the age-hardening at 150°C is remarkable. Heating at 525°C attain the rapid hardening and the highest hardness, but heating at lower temperature the less. Annealing at 400°C the solution-treated Mg-5.2%Zn-0.6%-Zr alloy, it is shown that the rate of hardening become slower and maximum hardness lower. The effect of solution-treatment on tensile strength of Mg-5.7%Zn-0.7%Zr show, similar inclination as hardness, but tensile strength falls into zero under the heat-treatment above 525°C, where abnormal structure is observed about the grain boundaries.
Explaining the phenomena under the various heat treatment on Mg-Zn-Zr alloy, it is very expedient to explain the phenomena below 300°C as solution and precipitation of Zn, and above 350°C as solution and precipitation of Zr.抄録全体を表示PDF形式でダウンロード (1469K)
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