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Volume 9 (1959)
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Volume 9, Issue 6
Displaying 1-11 of 11 articles from this issue
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Hideo ITOKAWA1959 Volume 9 Issue 6 Pages 3-4
Published: 1959
Released on J-STAGE: September 04, 2009
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Tsutomu SAKAI1959 Volume 9 Issue 6 Pages 5-6
Published: 1959
Released on J-STAGE: September 04, 2009
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Masanobu SASAGAWA, Shigeo KOBAYASHI, Jiro WADA1959 Volume 9 Issue 6 Pages 7-15
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSAfter deformed at -196°C, the structure of Al-Mg alloys is recovered as the temperature gets back. This recovery phenomenon is most sensible when the temperature becomes around room temperature. In this connection, a further experiment was made by use of Al-6%Mg alloy. The material was isothermally annealed at 30°C-60°C and its electrical resistance was measured. It was found out from the annealing curve that there was activation energy of 1.690 eV.
Through this experiment, it was considered that, at first, trapped vacancies, which have been fixed by soluble atoms, are made free, then, as rearrangment locally takes place due to the diffusion of Mg soluble atoms in the stress field of dislocation.
Single crystal of Al-6%Mg, having indentical orientation, was deformed by different heattreatments at the temperature of -196°C and 18°C.
This deformation was studied from the view-points of stress-strain characteristics, optics and electron microscope.View full abstractDownload PDF (4716K) -
Genjiro MIMA, Shigenori HORI1959 Volume 9 Issue 6 Pages 16-23
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSThere are many investigations on recrystallization of cold rolled aluminium sheets, but few on recrystallization phenomena of cold bent one. But forming occupies the greater parts in cold forming works and when such a bent material is heated in working or using, the metallurgical defects have frequently appeared. Nevertheless, probably nothing has been reported on the investigations which studies systimatically how to prevent from these accidents. This is a study on the changes of macrostructure and dimension of cold bent aluminium which take place through successive isothermal annealing. The findings are summarized as follows:
The appearances of recrystallized grain in the longitudinal section almost correspond with the stress distribution diagram induced from stress-strain curve.
Under low temperature annealing, there is a slight change in curvature of bending and the magnitude of shrinking in dimention increases remarkably caused by recrystallization on strain field below the value near 0.10. But when these samples are heated at temperature higher than 480°C, large shrinking in dimension and coarse grain in the longitudinal section take place, to which attention must be paid in practice.View full abstractDownload PDF (2409K) -
Takuichi MORINAGA, Shigeo ZAIMA, Kazuo KOSHIISHI1959 Volume 9 Issue 6 Pages 25-28,33
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSIn the previous experiment on the isothermal aging of duralumin (17S), it was found out that there was an unstable stage particularly in its early stage, where the internal structure fluctuated much; the hardness the decrement of the Harbert pendulum, the specific volume, the lattice constant and the intensity of the Debye ring remarkably changed upto the saturated value and, especially, the damping capacity of the oscillation was very sensibly affected so that many peaks appeared, and that these fluctuations were most remarkable under the temperature of 150°C-180°C.
Under this experiment, 2S was tried to be used for finding out whether the appearance of many peaks are caused by 17S or by the error of measurement, and also for getting some aid for analysing the aging phenomena, particularly the internal change in the early stage of aging.
Although 2S has been seamed to be a non-aging metal at least from the viewpoint of hardness curve, the result of the decrement of oscillation, the specific volume analysis and X-ray analysis shows there are considerable changes by aging. Especially, in early stage of aging, th changes of the damping capacity of torsional oscillation are very unstable and several peaks appear. It is thus found out that the aspect of the changes is similar to that in 17S's case, though they are in less degree. It can be said, therefore, that the big fluctuation of damping capacity in early of the aging of 17S is not dependent upon the complexity of the composition but upon such internal defects in material as dislocation.View full abstractDownload PDF (708K) -
Takuichi MORINAGA, Shigeo ZAIMA, Tsuneo TAKAHASHI, Mutsuo MINENO1959 Volume 9 Issue 6 Pages 29-33
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSAs previously reported, it was found out by measuring damping capacity, specific volume, lattice constant in X-ray analysis, etc. on the aging of 17S that the internal structure shows very complicated change in early stage and gradually becomes stable. It was known through the experiment on the aging of 2S, which was simple in chemical composition compared with 17S, that 2S also shows a change in internal structure similar to that by the aging and there was an unstable state especially in early stage though this had been looked to be a non-aging metal.
This time, the aging of Al-3%Cu alloy in the early stages was studied through the same experimental method in order to find out the influence of the added component on the aging. This material was used, because it had been studied many times on its internal change in aging by Mr. Hardy and others.
Up to this time the aging has been studied by measuring the damping capacity in torsional oscillation, but, in this experiment, the damping capacity in cantilever type transverse oscillation of the plate specimen was measured and the results were compared with ones by the former method. This was for finding out whether or not these unstable changes depend upon the measuring method and for confirming the reliability of the analysis method of measuring the damping capacity.View full abstractDownload PDF (699K) -
High temperature mechanical propertiesMakoto TSUKUDA1959 Volume 9 Issue 6 Pages 34-47
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSThis is to report of the results of the tests on short time high temperature tension test, tensile creep, bending creep, impact and hardness, all under high temperature, on such magnesium casting alloys as EK 30, EZ 33, AZ 63, AZ 92, A 10, ZK 51, ZK 61 and aluminium casting alloys such as Al-Cu-Ni-Mg (so called Y alloy) and Al-Cu-Mg-Si-Ti-Cr (so called Kobitalium).
It is found out from the result of the above-mentioned tests that the magnesium alloys which contain R. E. and Zr have excellent high temperature mechanical properties compared with ordinary magnesium alloys. Compared with aluminium alloys which are used for the under-high-temperature purpose, the above-mentioned magnesium alloys have less high temperature strength but more stability under different temperature.
Through the creep limit in 100 hours test, it was found that magnesium alloys have less stress level than aluminium alloys but when their light weight are considered, certain magnesium alloys are very useful and advantagous.View full abstractDownload PDF (1522K) -
Effects of alloying elements on high temperature mechanical propertiesMakoto TSUKUDA1959 Volume 9 Issue 6 Pages 48-56,68
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSWe experimented effect of aluminium, zinc and rare earth metals on high temperature mechanical properties of magnesium. We used the permanent mold cast, annealed and machined specimens with various content of aluminium, zinc and rare earth metals, and tested on high temperature tensile properties, high temperature impact properties and high temperature bending creep properties, at various temperatures.
We could find out that rare earth metals considerably improve the high temperature mechanical properties, and magnesium aluminium alloy or magnesium zinc alloy showed the derease of ductility at some temperature range. We considered the reason for this phenomena was due to the precipitation of magnesium and aluminium or zinc compound phase and recrystallization of alloys. But rare earth metals had very stable microstructure to high temperature and high recrystallization temperature. This is one of the cause that containing magnesium alloy containing rare earth metals could have good high temperature mechanical properties.View full abstractDownload PDF (1064K) -
Tomonobu KANNO, Torazo UEHARA, Masaro SAITO, Tadashi AOKI1959 Volume 9 Issue 6 Pages 57-59
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSX-ray analyses were made on the samples referred to in Report No. 1 and newly prepared samples of aluminium slag. The diffraction patterns and results of these analyses are shown in Fig. 1 and Table 2. Emission spectroscopy tests were also conducted on hard spots and denatured bricks, the results of which are given in Table 1.
As seen from the results of the emission spectroscopy tests, the hard spots consisted mostly of Al and Si; the bricks, once denatured, were largely made up of Si. From the X-ray diffraction patterns of these elements, the hard spots are supposed to be a mixture of α-Al2O3, α-quartz, metallic aluminium, metallic silicon and silicates of magnesium and calcium.
It is also considered that the α-quartz (SiO2) of the bricks before denatured react with fused aluminium during casting. Further oxides formed during the melting of metallic aluminium are α-Al2O3.View full abstractDownload PDF (415K) -
Masao KATO, Zenshiro HARA1959 Volume 9 Issue 6 Pages 60-68
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSAluminium flake powder for pigments is now usually manufactured by ball-mill method, instead of conventional stamp-mill method.
In order to develop a new process through comparative studies on those two methods, many experiments were made and the following facts were found out:
1. In the batch-type ball-mill, the ground material is elongated and disintegrated in the primary stage, but in the later stage, aluminium particles are aggregated together and grow into thick and polygonal particles. The covering properties of the powder thus decrease. This phenomenon is caused by many factors, particularly by quantity of material charged and the weight of steel ball used.
2. In the compound-type ball mill, into which N2 gas stream is introduced, the produced fine particles are carried away so that the aggregation does not take place. The flake powder with higher covering properties is thus obtained.
3. Aluminium flake powder with high leafing properties can be obtained by agitating the powder in solvent which contains certain surface-active agents. In this case, type of solvent, griding method with agitation and other factors give different effects on the leafing properties of the powder.View full abstractDownload PDF (1802K) -
1959 Volume 9 Issue 6 Pages e1
Published: 1959
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSDownload PDF (19K)
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