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Volume 13 (1963)
- Issue 6 Pages 379-
- Issue 5 Pages 305-
- Issue 4 Pages 225-
- Issue 3 Pages 141-
- Issue 2 Pages 67-
- Issue 1 Pages 1-
Volume 13, Issue 4
Displaying 1-11 of 11 articles from this issue
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Rinzo MIDORIKAWA1963 Volume 13 Issue 4 Pages 225-226
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
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Yasuo OHNO1963 Volume 13 Issue 4 Pages 227-230
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe investigation on the Zone-Refining of aluminium by high frequency induction heating have so far been much reported. But the investigation by Ni-Cr wire heating has not been reported so much, the author studied on the condition of Ni-Cr wire heating of the Zone-Refining of Al and measured the recrystallization temperature. With this measuring the author conjectured the degree of purification instead of the chemical analysis. Also, the effect of intermediate annealing temperature on the abnormal grain growth after the light tension work was studied.
It was found out that the slowest speed (8mm/hr) gives a very good result in case of Ni-Cr wire heating and more purified aluminium needs higher temperature of the intermediate annealing to get the large grain size by the abnormal grain growth.View full abstractDownload PDF (477K) -
Blistering caused by pick-up of gas during melting and castingNamio KAWASHIMA, Hajime YAMADA, Yutaka SATO1963 Volume 13 Issue 4 Pages 231-236
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSBlistering in aluminium sheet are mostly caused by hydrogen which is considered to come from water vapour. When water vapour reacts with aluminium under high temperature, atomic hydrogen is generated. Such hydrogen is absorbed into aluminium and makes blisters. It is generally known that the absorption of hydrogen takes place during the process of melting, casting and also annealing.
This is the study on the above-said phenomenon and the flux for degassing. The findings are as follows:
(1) Blistering in sheet and porosity in ingot is in the direct proportional relation. It is considered, therefore, that the main cause of blistering is the gas contained in the sheet ingot. However, no blistering takes place when the porosity in ingot is less than 0.03%.
(2) The porosity in sheet ingot is much affected by the humidity in atmosphere during casting process. The gas absorption is most remarkable when the absolute humidity is more than 24g/m3 (relative humidity: 70%, 30°C)
(3) The humidity in the atmosphere influeuces much to the release of gas during casting and solidifying process.
(4) The following fluxes are quite effective for degassing: NaCl and CaCl2 as chlorides, and NaF as flouride. When they are mixed at the ratio of (NaCl+CaCl2):NaF=1:2, the effect for degassing gets the highest.
(5) K2ZrF6 is very effective flux for degassing. It is also less hygroscopic than offer fluxes.View full abstractDownload PDF (815K) -
Influence of copper and ironHiroshi NAKAMURA1963 Volume 13 Issue 4 Pages 237-246,283
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn this paper is described the observation on the effect of copper and iron upon the age-hardening and corrosion resistance of Al-Mg-Si alloys, when they contain magnesium and silicon either in the exact ratio for forming Mg2 Si or in the ratio of excess silicon.
The followings are the findings:
(1) On the effect of heat treatment; iron acts negatively, particularly in the case of "excess silicon" situation. On the other hand, copper acts positively while this effect is weakened by the co-existance with iron.
(2) Either copper and iron decreases the corrosion resistance of the alloy, especially when the amount of iron exceeds 0.3% in the co-existence with excess silicon.View full abstractDownload PDF (919K) -
Yasuo OHNO1963 Volume 13 Issue 4 Pages 247-256
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effect of the intermediate annealing on the abnormal grain growth after the light tension work and the grain coarsing after the medium rolling work (30-50% red) of Al with various impuritis and Al-Mg alloys were investigated.
It was found out that only when the intermediate annealing temperature was high, the large grain size after the abnormal grain growth is appeared, and this was not caused by the impurity but the grain size before the light tension The grain coarsing after the medium rolling work was observed when the intermediate annealing temperature was relatively low, and this was caused by the impurities contained (perhaps Fe in Al).View full abstractDownload PDF (1809K) -
Shotaro MOROZUMI, Saburo ISHIKAWA, Shigeyasu KODA1963 Volume 13 Issue 4 Pages 257-265
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis is to report on the experiment of extrusion of Mg-1% Al and Mg-0.6% Zr in powder. These alloys were used separately and also in mixture of 50-50. Through the experiment the followings were measured: curves of extrusion pressure versus temperature; appearance of extrusions; tensile strength of the materials extruded at different speeds and temperatures; tensile strength of annealed materials; macro and micro-structure of the material before and after extruded. These values were compared with those of the same materials extruded from cast billets and the findings are as follows: To obtain good powder extrusions, relatively high temperature (450°-500°C), high reduction rate and high pressure are required. Softening of powder extrusions by annealing is less than that of extrusions from billets, because the dispersed oxide inhibits the grain growth. The extrusions of mixed powder of the two alloys (Mg-1% Al and Mg-0.6% Zr) keep higher strength after annealing. Extrusion process is also discussed here from the view point of metallography.View full abstractDownload PDF (2478K) -
On the non-heat treatment aluminium-magnesium alloy contain zincTakuichi MORINAGA, Tsuneo TAKAHASHI1963 Volume 13 Issue 4 Pages 266-272
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAluminium-magnesium-zinc casting alloy is not included in the Japanese Industrial Standard but a little addition of zinc to aluminium-magnesium alloy somewhat improves the mechanical properties and fluidity. (Alcoa A214, NF A-G4Z)
From this standpoint, the authors made some experiments on this alloy.
The specimens being prepared, zinc was added in solid state and process was practically same as that to make the aluminium-5 per cent magnesium alloy. The chemical compositions (added composition) of the specimens are as follows:
Mg: 4.0, 5.0%, Zn: 0, 1.0, 1.5, 2.0, 2.5, 3.0%
Fe: 0, 0.2, 0.4%, Mn: 0, 0.4% Si: Not added
In 4 per cent magnesium alloys, tensile, yield strength and hardness increase as the amount of zinc increases but when 2.0-2.5 per cent zinc is added the tensile strength, hardness, elongation decrease sharply but yield strength does not. Similar behavior is observed in 5 per cent magnesium, less zinc alloys.
Under the corrosion test of 4 per cent magnesium alloys in sodium chrolide aqueous solution, weight loss is not critical when zinc content is less than 2 per cent. However, in case of 5 per cent magnesium, this point is decreased to 1.5 per cent zinc. The addition of manganese improves the corrosion properties remarkably, and addition of iron gives the same effect.
When submerged into city water, weight change is less than that in case of sodium chloride aqueous solution. But, the pitting type corrosion is appeared and manganese is not very effective for this.View full abstractDownload PDF (1494K) -
On the hard anodic films produced by sulfuric acid processTakakado NAKAYAMA, Tadao MAEKAWA, Toru MATUZAWA1963 Volume 13 Issue 4 Pages 273-283
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis work was carried out on the effect of anodizing conditions, such as bath temperature, current density (D. C.), bath concentration, treatment time etc. on the properties, that is, film thickness, hardness, crack, colour, brightness, wear resistance and corrosion resistance of hard anodic film produced on 2S aluminium sheet by sulfuric acid process.View full abstractDownload PDF (1288K) -
Masatoshi KOBAYASHI1963 Volume 13 Issue 4 Pages 284-298
Published: July 31, 1963
Released on J-STAGE: October 30, 2008
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1963 Volume 13 Issue 4 Pages e2a
Published: 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (100K) -
1963 Volume 13 Issue 4 Pages e2b
Published: 1963
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (97K)
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