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Volume 36, Issue 8
Displaying 1-10 of 10 articles from this issue
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Tadahisa NAKAMURA1986 Volume 36 Issue 8 Pages 461-462
Published: 1986
Released on J-STAGE: March 14, 2011
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Kazuyoshi KATO, Hiroshi TOKISUE1986 Volume 36 Issue 8 Pages 463-469
Published: 1986
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSIn friction welding of 5052 wrought alloy to high pressure castings of AC4C, several welding conditions and mechanical properties of welds were investigated. The conventional type of friction welding machine was used. On the 5052 alloy, fine grain structure resulting from disappearance of fiber one was observed closely near the weld interface and modified fiber one along the flow direction of burr at the heat-affected zone. While on the side of castings fine grain structure having no sign of cast one was observed closely near the weld interface. The hardness of both the annealed and the as received 5052 alloys at the weld interface had higher values than that of the castings. The highest tensile strength of weld joint could be obtained when friction time was 2 second, but it was lower than that of the base metals. And when friction time was 1 and 2 second the elongation of weld joints showed the similar values to that of castings. The impact values of the joint having a notch at the weld interface were inferior to that of the base metals.View full abstractDownload PDF (8516K) -
Shigeru OKANIWA, Masahiro YABE, Keiichiro KAWASAKI, Hideyuki MIZUTANI1986 Volume 36 Issue 8 Pages 470-476
Published: 1986
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSThe cutting mechanism of the alloy some non heat treatable free cutting aluminum alloys, has been investigated with a cutting state frozen equipment in order to consider the machinability. The machinability of each alloy has also been examined by the turning tests. Results obtained are as follows Al-Mn-Si alloys and Al-Mn-Mg alloys differ remarkably from each other in the shape of built-up-edge. The tool wear is influenced by compounds and precipitates in the alloy. Good chips disposal is obtained by addition of silicon and bismuth. Magnisum in the alloy has an effect of diminution of the cutting force and the cut surface roughness, especially at low cutting speed. The chips tend to become more segmental with increasing tool feed, while the cutting force and the cut surface roughness decrease with increase in cutting speed.View full abstractDownload PDF (6325K) -
Osami SERI, Kousuke TAGASHIRA1986 Volume 36 Issue 8 Pages 477-484
Published: 1986
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSThe effect of iron and silicon on corrosion behavior of Al-Fe-Si alloys of varying Si/Fe ratio ranging from 0.01 to 104 and Al-Si alloys containing 0.1%-1.49% Si have been examined by means of immesion corrosion test and electrochemical measurements. Relationships between weight loss and Si/Fe ratio in the alloys were analysed in terms of the Si/Fe ratio. Corrosion weight loss of commercial aluminum is minimum when the Si/Fe ratio is less than unity.View full abstractDownload PDF (2916K) -
Goroh ITOH, Hiroshi SAITOH, Bin-Lung OU, Hisashi SUZUKI1986 Volume 36 Issue 8 Pages 485-490
Published: 1986
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSThe effect of homogenization conditions on the recrystallization during solution-treatment has been studied on hot-rolled Al-5.6%Zn-2.5%Mg-1.6%Cu- (0.12-0.27) %Cr alloys. The condition of obtaining a marked inhibition of recrystallization was not always consistent with that of obtaining the fine and dense distribution of E phases inside the dendritic cell. It was suggested that the absence of PFZ in the area adjacent to the cell boundaries, together with the fine and dense distribution of E phase, was of great importance for suppression of recrystallization during solution-treatment. Recrystallization was most suppressed, when the ingot was held at 200-300°C for a prolonged time in the course of heating to the homogenization temperature.View full abstractDownload PDF (14142K) -
Yagoro HIROSE, Yoshimitsu MIYAGI, Mitsuo HINO, Takehiko ETO1986 Volume 36 Issue 8 Pages 491-497
Published: 1986
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESS7475 aluminum alloy sheet with a grain size of about 10 μm showed a large elongation of 780% when deformed at 516°C with the strain rate (ε) of 2×10-4 sec-1. The plastic deformation behavior was greatly affected by grain size (d), deformation temperature and strain rate, and was represented by εαd-n where n=1.8-2.5 at 516°C. Moreover, an activation energy for the deformation was found to be 84 kJ/mol, which is about a half of that of creep deformation. The superplastic deformation can be explained by a diffusion accomodated grain boundary sliding model.View full abstractDownload PDF (5031K) -
Toshio ENJO, Kenji IKEUCHI, Hiroyuki FUJITA1986 Volume 36 Issue 8 Pages 498-506
Published: 1986
Released on J-STAGE: March 14, 2011
JOURNAL FREE ACCESSThe ultrasonic vibration has been applied in the diffusion welding of aluminum in an attempt to break up the superficial oxide film of the bond interface. The ultrasonic vibration and subsequent welding have been carried out in a vacuum of 10-2 Pa at 875 K to 893 K under a welding pressure of 1 to 3 MPa. The bond strength increased with the increase in the input power to the transducer and working time of ultrasonic vibration. The increase in pressure to the bond interface during the vibration, however, lowered the bond strength. TEM observation and electric resistance measurement of the bond interface revealed that the application of ultrasonic vibration had the effect of breaking up and dispersing the oxide film, which was closely related to the increase in bond strength. On the fractured surface of joint, dimple patterns, increased with the rise of bond strength. These portions may be regarded as places where the application of ultrasonic vibration promotes breaking up and dispersing the oxide film.View full abstractDownload PDF (8531K) -
Shigeru OKANIWA1986 Volume 36 Issue 8 Pages 507-513
Published: 1986
Released on J-STAGE: March 14, 2011
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Hiroshi KAWASE1986 Volume 36 Issue 8 Pages 514-524
Published: 1986
Released on J-STAGE: March 14, 2011
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Shigeyasu KODA1986 Volume 36 Issue 8 Pages 525-533
Published: 1986
Released on J-STAGE: March 14, 2011
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