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Volume 9 (1959)
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Volume 9, Issue 3
Displaying 1-8 of 8 articles from this issue
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Chiuyo HISATSUNE1959 Volume 9 Issue 3 Pages 3-4
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSDownload PDF (703K) -
On the anti-corrosive effect of the treated surface of aluminium alloy by anode oxidation process in brandyTakuichi MORINAGA, Shigeo ZAIMA, Motoo KAGAMI1959 Volume 9 Issue 3 Pages 5-9
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSIn the previous time, the report was made on the result of preliminary test of anti-corrosive effect against white-wine of “Alumirite” film, formed under anode oxidation treatment by use of sulphuric acid. To obtain the further referencial data for the utilization of aluminium alloys in wine industry, the subsequent test was made on the anti-corrosive effect against brandy, which severely attacks aluminium alloys, of the film formed on the surface of aluminium sheet under anode oxidation treatment with mixed solution of sulphuric and oxalic acids. In the same time, the anti-corrosive effect of the surface treatment in case of the treatment being imperfectly made, (namely, approximately 1.78 percent of the surface being exposed to the air) and also the influence of the base materials (1S and 2S) to the anti-corrosive property of the film were tested.View full abstractDownload PDF (595K) -
Electropolishing of aluminium containing impurities (Part 2)Takakado NAKAYAMA1959 Volume 9 Issue 3 Pages 10-20
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSThis is to report on the result of experimental work to find out the effect of impurity contained and heat treatment to the reflectivity of electropolished surface of aluminium alloys which contain slight quantity of Fe or Si.
This experiment was made as a preliminary step of the study on the same effect to the reflectivity of electropolished surface and electropolished-and-anodized surface of aluminium binary alloys in general.
Findings are as follows:
1. From the experiments for which the aluminium alloys containing 0.001%-0.11% of Fe, were used, it was found that Fe content did not give much effect to the reflectivity of the electopolished surface. The reflectivity of alloys containing less than 0.047% of Fe was not changed, but that of those with 0.11%Fe was slightly decreased.
2. From the experiments for which the aluminium alloys containing 0.003-0.26% of Si were used, it was found that the reflectivity of alloys with more than 0.2%Si was little decreased when they were annealed at 350°C, while it was little improved when the samples were quenched at 520°C.
These effects are similas to the change in the limit of their solid solubility.View full abstractDownload PDF (1443K) -
On the casting crackTorao KOBAYASHI1959 Volume 9 Issue 3 Pages 21-34
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSA new apparatus for measuring casting crack that sometimes occurs during soidification after molten metal is cast into mould was made by the author, which can automatically and simultaneously record cooling temperature time and stress time curves in continuity by means of quartz piezometer, vacuum tube amplifier and electromagnetic oscillograph as shown in Fig. 2.
1. The stress at crack occurring point measured by the apparatus is useful for quantitatively expressing the tendency to cracking,
2. Casting crack of all Al alloys that were tested on occurred always at temperatures below the solidus.
3. Tensile strength of alloys at temperature in the vicinity of solidus could be measured with this apparatus.
4. Effects of maximum melting temperature and pouring temperature, as casting conditions, on casting crack have been investigated.
5. General relationship between the tendency to cracking and composition of Al binary alloys has been observed as follows:-
(a) Al with the purity of less than 99.8% is fairly susceptible to cracking.
(b) Alloys with constituent of maximum solubility limit or thereabout are subject to maximum tendency to cracking. The constituent, however, makes considerable shifts to the side of α solid solution, in conformity with the degree of segregation at solidification of alloy.
(c) Alloys of eutectic constituent or in the neighborhood are least susceptible to cracking.
In consequence of the above studies, mechanism on the occurrence of casting crack has been theoretically explained in comparison with Singer and other's Studies.View full abstractDownload PDF (2215K) -
Effect of Zr on mechanical properties of magnesium and it's alloysMakoto TSUKUDA1959 Volume 9 Issue 3 Pages 35-44
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSAddition of zirconium to magnesium and its alloys makes the grain size finer and the mechanical properties remarkable better. When 0.3-0.6% of zirconium is added, the grain size of commercially pure magnesium becomes greatly finer. The grain refinary action by zirconium is larger then that by cooling speed. Thus, the tensile strength, elongation, hardness, impact value of the metal are much improved.
This can be said also on magnesium-zinc, magnesium-rare, earth metals, magnesium-rare earth metals-zine alloys. Amongst all light casting alloys, magnesium-zinc-zirconium alloy has the highest tensile strength.View full abstractDownload PDF (2880K) -
On castabilityMakoto TSUKUDA1959 Volume 9 Issue 3 Pages 45-52
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSIt was found out through the preparation of the test specimen that the magnesium alloys containing zirconium has not good casting properties.
The experiment was made, therefose, for comparing the castability-depth of shrinkage pipe, length of liner shrinkage and hot shortness-of this kind of alloys and other conventional magnesium alloys.
Shrinkage properties and hot shortness of this kind of alloy are larger than those of AZ alloys. It is quite often that large segregation of zirconium is found in thick wall parts of castings, but this phenomenon can be avoided by controlling the cooling speed.View full abstractDownload PDF (1938K) -
On molding sandMakoto TSUKUDA1959 Volume 9 Issue 3 Pages 53-61
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSThrough the preparation of the test specimen, it was found out that the effective inhibitor, for protecting the casing from oxidation, was necessary for the sand mould casting of magnesium base alloys containing rare earth metals.
In order to find out the most suitable reagents as the inhibitors, the following experiments were carried out:
Checking of the decomposition of reagents by heating, examination of the surface of specimen traially cast by use of the said reagents, and test on the effects of the reagents to the properties of moding sand.
As the result of the above-mentioned experiments, it was found out that S, HBO3, Na2O·(BF3)4, CH2OH·CH2OH were most effective for the purpose and more quantity of the reagent was required than in case of casting with other alloys.
Regarding the conditions for drying the mold, it was known through the experiments that slower heating at low temperature was necessary.View full abstractDownload PDF (1475K) -
Buntaro OTANI1959 Volume 9 Issue 3 Pages 62-76
Published: May 31, 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSDownload PDF (4888K)
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