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Volume 12 (1962)
- Issue 6 Pages 349-
- Issue 5 Pages 283-
- Issue 4 Pages 221-
- Issue 3 Pages 143-
- Issue 2 Pages 69-
- Issue 1 Pages 1-
Volume 12, Issue 2
Displaying 1-10 of 10 articles from this issue
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Hiroshi ASADA1962 Volume 12 Issue 2 Pages 69-72
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (718K) -
Hiroumi KONDO, Fukutaro KURATA1962 Volume 12 Issue 2 Pages 73-76
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis is to report on the study of the symplified volumetric analysis of organic materials contained in bauxite, red mud and sodium aluminate solution by means of titration of potassium bichromate.
1) The data on bauxite and red mud from this process are well agreed with those from combustion analysis.
2) The quantitative ratio of carbon contained as organic acid is not sufficient.
3) As the humic acid is decomposed to many kinds of organic acids, the quantitative ratio is not sufficient in sodium aluminate solution. However, it is found out that this ratio is better than that of the usual potassium permanganate titration.View full abstractDownload PDF (1807K) -
Takuo IKKATAI, Noboru OKADA1962 Volume 12 Issue 2 Pages 77-82,76
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSA good many studies have so far been reported on the properties of sodium aluminate solution. The investigation of the properties is indispensable for alumina engineers to establish better conditions of operation and also to design the piping and other plant elements. Most of such studies are, however, made in the range which is not broad enough, and are not well-arranged to be ready for uses.
In this study, the specific gravity and viscosity of the solution were measured under the following conditions;
Temperature 20°C 40°C 60°C 80°C
NaOH concentration 100g/l 150g/l 200g/l 250g/l
Al2O3/Na2O mol Ratio 0 0.35 0.45 0.55 0.65
and the results were organized into equations
The monograms of the above results were also made so as to be made use for practical uses.
The alumina equilibrium concentration in sodium aluminate solution was also determined, for which an equation and a monogram were made.View full abstractDownload PDF (2917K) -
Namio KAWASHIMA, Hajime YAMADA, Motoshi NISHISAKA, Takamasa YOKOTE, Is ...1962 Volume 12 Issue 2 Pages 83-90,99
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe recrystallization behavior of super-purity aluminium is much influenced by a small amount of impurities therein contained. According to Trillat, for example, 99.9986 percent purity aluminium starts to recrystallize slowly at 0°C, and is fully recrystallized when heated at 100°C for 6-10 minutes, while 99.997 percent purity metal does not ercrystallize even heated at 100°C for 6hrs.
Meanwhile, one of the authors has found out that 99.996 percent purity metal begins to recrystallize in 40 days under room temperature and in 80 days under 0°C, while 99.994 percent or under metal does not recrystallize under room temperature even after 6 months.
This is to report about the study on the recrystallization behavior of 99.999 purity metal which is produced by the three-layer electrolytic refining process.
The findings are summed up as follows:
(1) Self-annealing phenomenon in 99.999 percent metal takes place easily in the process of cold rolling. Under the cold rolling at 20°C, its recrystallization ratio, when the heavy reduction of 90% to 96.7% in given, reaches to 10% to 18%. The effect of reduction to this phenomenon is quite remarkable, but under the reduction of less than 75%, such self-annealing phenomenon is not observed.
(2) The effect of reduction on the recrystallization temperature is also remarkable. The recrystallization temperature and activation energy sharply decrease as the reduction increases.
(3) Recrystallization is observed in the metal, to which the heavy reduction of 96.7% is given, in two or three months under the temperature of 0°C. Meanwhile, under the room temperature, the metals, to which 96.7%, 90% and 75% reduction are given, shows the recrystallization area of about 70%, 50% and 2% respectively in 100 days. (Before aging, the area is 18%, 10% and 0% respectively) On the other hand, when the reduction is 60%, the recrystallization does not take place in the same period. But, by the aging at 58°C, the recrystallization area increases rapidly within 8 days as same as in the case of 100 day-aging at room temperature.View full abstractDownload PDF (3626K) -
Isamu IGARASHI, Tamotu IGARASHI1962 Volume 12 Issue 2 Pages 91-99
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis is report on the annealing at 300°C of cold-rolled commercial-purity aluminium, in due course of a report on the annealing of cold rolled high-purity aluminium poly-crystal. The softening, recovery and recrystallization of the metal have been studied by measuring the diffracted X-ray intensity count number of the Debye-scherre ring by use of G. M. counter.View full abstractDownload PDF (2810K) -
Akira FUJIWARA, Masahiro CHIKUDA1962 Volume 12 Issue 2 Pages 100-109
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is generally known that Al-Mg alloy is the most suitable for deepdrawing amongst all kinds of aluminium alloys. This study is to investigate the specific Al-Mg alloy which is the best in deep drawability, strength and weldability. For that purpose, the influences of the magnesium contents, soaking, reduction rate, addition of manganese, chromium and other impurities, annealing temperature were examined.
The ingot of 250mm × 150mm × 35mm was rolled down to the sheet of 1.00mm thickness under different conditions. With this sheet, conical die test, tensile test, bending test and Erichsen test were carried out. Used conical die is of 60° in die angle and 19.00mm in die hole diameter. Punch is 17.46mm φ and punch radius is 4.0mm.
The findings are as follows:
1) Magnesium content does not give much effect to the deep-drawability of the alloy.
2) When deep-drawability and stretchability are required, Al-Mg pure binary alloy is recommended, and in this case, lower magnesium content is appropriate in view of the Erichsen value. The properties of this kind of alloy is not affected by iron and silicon content as impurities.
3) When bending work has weight, the addition of manganese or chromium is recommendable. The increase in Si and Fe content also shows good result.
4) Existance of manganese together with chromium in this alloy makes its drawability and stretchability worse.
5) Soaking is good for better deep-drawability.
6) Greater cold reduction is better for deep-drawability.
7) Higher the final annealing temperature, the better result.
8) Under the annealing temperature of 350°C and more, mechanical properties do not show any change, while the deep-drawability is improved. There will be any correlationship between deep drawability and machanical properties in such range of annealing temperature.View full abstractDownload PDF (5014K) -
Shigeo MUROMACHI, Tomoya MINEGISHI, Teruo KOJIMA1962 Volume 12 Issue 2 Pages 110-118
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSFrom the study on the relation between gas and small amount of elements in aluminium, the following findings were obtained.
1) Elements in aluminium are classified into two; poor absorbers as Zn, Cu, Fe, Mn, Mg, Be and good absorbers or chemical absorbers as Si, Ca, Ba.
2) Effects of Si, Zn, Cu and Fe on gas in aluminium are sensible. But those of Mn, Mg, Be are like those of Ca and Ba as chemical absorbers.
3) Addition of small amount of Ca, Ba and Be to aluminium is effectively control the gas. Amongst these, Ca acts most effectively.
4) Si and Fe as impurities in aluminium badly affect on degasification, when their content in about 0.1%.View full abstractDownload PDF (5384K) -
Tomoya MINEGISHI1962 Volume 12 Issue 2 Pages 119-127
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDegassification mechanism of Cl2 or chlorides for molten aluminium is determined by measurement of E. M. F. between molten aluminium (including gas or not) as one electrode and fused chrolides (NaCl, KCl, CaCl2 and their binary and ternary system) as electrolyte. Another electrode for reaction in salts is carbon rod.
The findings of this experiment are as follows:
The main reaction between molten aluminium and fused salts is production of AlCl3 due to the decomposition of chloride. AlCl3 thus produced is vaporized and disturb the molten metal such physical action works as degassification of H2 from molten aluminium. H2 in molten aluminium and Cl2 from decomposition of chlorides makes HCl. This is also an important reaction for the degassification of aluminium. By this reaction, E. M. F. of the cell, which consists of fused salts and molten aluminium, become lower.
The degassification mechanisum as a chemical reaction is explained as follows:
Al+Cl2→AlCl3↑and Cl2+H2(in Al)→HCl↑for Cl2
Al-MCl-O2→MO-AlCl3↑and Cl2+H2(in Al)→HCl↑for chloride.
Ability of degassification by chlorides is determined by decomposition velosity for Cl2 in molten Al.View full abstractDownload PDF (5228K) -
Observation of situation and micro-structure of hard-spotTorazo UEHARA1962 Volume 12 Issue 2 Pages 128-134
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is generally known that there are three kinds in hard-spots which appears in aluminium die castings. But, another kind of hard-spot was found, which is not observed in micro-structure. This hard spot is named here as "Hardspot of Segregation, because alloying elements are concentrated in it.
Therefore, this hard-spot shows aluminium alloy structure. It generally appears on the overflow-side (riser) of die casting.
From observation of micro-structure of various kinds of hard-spots, the following results were obtained:
(1) The structure of hard-spot is fine and chilled. It seems that alloying elements are concentrated in it.
(2) The micro-structures of hard-spots are classified into five kinds. One of them is extremely fine compared with others.
(3) Some of such structure are homogeneous and some are unhomogeneous.
(4) Boundaries of hard-spots are also classified into several kinds. It is considered they are different according to the conditions under which the segregation takes place.
(5) Grains of alloying elements contained in the structure of hard-spots are extremely fine.View full abstractDownload PDF (4788K) -
Riei ICHIKAWA, Takatoshi TANIKAWA1962 Volume 12 Issue 2 Pages 135-140
Published: March 31, 1962
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effects of alloying elements on the damping capacity of cast magnesium and aluminium alloys were investigated by means of observing the free decay on torsion pendulum method. For this purpose, magnesium binary and ternary alloy containing Ag, Al, Bi, Cd, Cu, La, Pb, R. E., Sb, Si, Sn, Zn and Zr and aluminium alloys of Al-Cu, Al-Mg and Al-Si, were used.
The findings are as follows:
1. Generally, the damping capacity of magnesium and its alloys is considerably higher than that of aluminium and its alloys.
2. In the cases of such alloys having wide solubility of α-solid solution as Mg-Cd, Mg-Pb, Mg-Sn, Mg-Al, Mg-Ag, Mg-Zn and Mg-Bi, the damping capacity gets lower with the increase in the quantity of alloying elements, while in the cases of alloys having small solubility of α-solid solution such as Mg-Cu, Mg-La, Mg-Sb and Mg-Si, such phenomenon is not observed.View full abstractDownload PDF (2766K)
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