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Volume 16 (1966)
- Issue 6 Pages 282-
- Issue 5 Pages 217-
- Issue 4 Pages 169-
- Issue 3 Pages 113-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 16, Issue 2
Displaying 1-7 of 7 articles from this issue
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Minoru TAKEMOTO1966 Volume 16 Issue 2 Pages 57-58
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (322K) -
The effect of heat treatment on recrystallization characteristics of Al-0.23% Zr alloy produced by continuous casting processTakashi ARAKI, Shinichi KOMORI1966 Volume 16 Issue 2 Pages 59-62
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAs shown in the previous studies, when the content of Zr was increased for raising the recrystallization temperature of Al-Zr alloys, higher casting temperature and more rapid cooling were required in accordance with the content. Accordingly, it was considered difficult to produce an industrial size of homogeneous ingot of Al-Zr alloys.
The present study explained that the alloy, having lower content of Zr (lower than 0.3wt%), could produce stable and homogeneous ingot by continuous casting, and the recrystallization temperature was made higher by the effect of proper intermediate heat treatments.View full abstractDownload PDF (694K) -
Shiro TERAI, Riki HAGIWARA1966 Volume 16 Issue 2 Pages 63-73
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThese studies were made on the effects of the diffusion of the third elements into alclad-aluminum alloy sheets by microscopic observation and microhardness testing of the section of the test specimens.
The results were as follows.
1. The addition of 0.35-0.5% of Zr to the clad material seemed to have remarkable effects of inhibiting diffusion of core material into the clad. Mn and Cr had almost the same effects as Zr.
2. The effects of the addition of Mn or Cr were not so distinct as those of Zr.
3. It was observed that the addition of Mn, Cr, or Zr to the clad material inhibited the boundary diffusion of core material into the clad.
4. Hardness values measured were not always the same at the same distances from the boundary even in the clad of one specimen section. It might be attributed to the difference of diffusion into the respective crystal grains.View full abstractDownload PDF (1875K) -
The relation between the figure and the accuracy of drilled holeShigeo ZAIMA, Akiyasu YUKI1966 Volume 16 Issue 2 Pages 74-82
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effects of the out-of-roundness of counter-sinking on the accuracy of the size of drilled hole were examined on four kinds of aluminum sheets, 3S-R, 52S-R, 61S-R, and G4-R (each about 6mm thick), for various drill dimensions.
The pattern of countersunk figure was made with plaster at the last stage of sinking. The drilling was continued and the size of hole on the both faces of the sheet was measured by using shadowgraph. The hole was finished with end mill and the size of the hole was measured at the specified depth. Then, the effects of drilling conditions such as angle of drill tip, angle of relief, angle of chisel edge, relative height of lip, and angle of torsion on the accuracy of the size of drilled hole were researched.
The results were summarized as follows.
The relationship between the out-of-roundness of the countersink and the enlargement of the diameter of circumscribed circle of the hole was very intimate on the surface of the sheet, but it was not so distinct on its back face. If the Point angle was constant (118° in this study), the out-of-roundness of the countersink and the enlargement of the hole on the surface increased with the increase of the Chisel edge angle. The out-of-roundness of drilled hole was not always large at the entrance of the hole or it did not always gradually decrease with the depth of the hole, but in most cases, it gave the largest value at the middle depth of the hole.
In accordance with the above results, a discussion was made on the drill dimension recommended hitherto for the drilling of aluminum. It was found that the recommended dimensions were proper for hard materials such as G4-R; but were not proper for soft materials such as 3S-R. In the latter, the Point angle and the Chisel edge angle would be smaller than those of the recommended dimensions for obtaining good accuracy of drilling.View full abstractDownload PDF (975K) -
Shiro FUJINO1966 Volume 16 Issue 2 Pages 83-90
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe behavior of Mg evaporation from Al-(3-12%) Mg-(0-0.01%) Be alloys during heating under reduced pressure was investigated by the differential thermal analysis and thethe measurement of pressure in a closed vessel. When the content of Mg was higher, the evaporation happened under higher pressure in vessel and at lower temperature than when the content was lower. The addition of Be had effects of inhibiting Mg evaporation.
The evaporation of Mg from pure Al-5% Mg-(0-0.01%) Be alloy and Al-10%-(0-0.01%) Be alloy under reduced pressure after holding at 725 or 715°C for 0-60min. was investigated by the same method as previous. The relation between the holding time of the melt and the limit value of reduced pressure was studied. The limit values of reduced pressure for the above both alloys were larger (i.e., lower pressure) when the content of Be was lower and the holding time was longer (at least more than 15min.). The limit value of reduced pressure for these alloys, containing more than 0.004% of Be, was lower than 0.7mm Hg. The results obtained by commercial Al-(5 or 11%) Mg-(0.005%) Be were nearly the same as those by pure alloys.View full abstractDownload PDF (786K) -
Study on Al-Si-Cr-Mg-Zn alloys (Part 2)Chuyo HISATSUNE, Takeo SHINODA1966 Volume 16 Issue 2 Pages 91-95
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effects of the addition of various elements on the mechanical properties of Al-Si (8.5%)-Cr (0.3%)-Mg (1.0%)-Zn (1-2%) alloys were investigated and the following results were obtained.
(1) The increase of the addition amount of Fe lowered the tensile strength of the alloys. Accordingly, the content should be kept at as small value as possible.
(2) The addition of 0.2-1.0% of Cd improved the tensile strength and elongation of the alloys to some extent. However, the addition of Ti or Be gave no effects, and the addition of Ni, Mn, Cu or P lowered the tensile strength of the alloys.View full abstractDownload PDF (523K) -
Mamoru IMABAYASHI, Kohei TOMITA, Harero IWAMURA1966 Volume 16 Issue 2 Pages 96-105
Published: March 31, 1966
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effects of the following factors on degassing of Al-5% Mg alloy (AC7A) were investigated.
(1) Degasser.
(2) Degassing temperature.
(3) Flux during melting period.
(4) Flux during holding period.
(5) Holding time.
Commercial ingot (AC7A) was melted under various degassing conditions and cast into isolite or copper mould for preparation of the specimens for estimating specific gravity and gas content.
The effects of the above factors on degassing of the melts were shown by the specific gravity and gas content of the specimens, as follows.
(1) The most significant factors among these were degasser and holding time.
(2) Among degassers, hexachloroethane (C2Cl6) and titanium tetrachloride (TiCl4) were more effective than nitrogen, because the effects of degassing action by nitrogen appeared more slowly than those of other degassers.
(3) The effects of flux during the melting period remained in the melt after degassing. Therefore, gas content after degassing was related with the content during melting period. The selection of flux should be considered as an important factor for preventing absorption of gas caused by the reaction between melt and moisture in flux or in atmosphere.
(4) In the range of temperature, at which these experiments were conducted, gas content tended to increase with the rise of temperature, but the relation was not so distinct.
(5) Almost no effects were given by the flux during the holding time, but it was effective only at higher holding temperature.View full abstractDownload PDF (1226K)
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