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Volume 33, Issue 10
Displaying 1-9 of 9 articles from this issue
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Seiki NISHI1983 Volume 33 Issue 10 Pages 571-572
Published: October 31, 1983
Released on J-STAGE: July 23, 2008
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Hiroshige MURATA, Tsuneo TAKAHASHI1983 Volume 33 Issue 10 Pages 573-578
Published: October 31, 1983
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffect of oiliness agents in the lower-viscosity base oil than those which are generally used for deep drawing on drawability and observations on the surface condition of drawn cups of 1200-O aluminum sheet were studied.
The limiting drawing ratio under the identical drawing speed increases by the use of higher-viscosity lubricating oils, and those values using high-viscosity oils are greater than using low-viscosity oils during the whole drawing speed. The drawing force decreases with increasing the viscosity of oils. The skin roughness on the drawn cups becomes flatter face with low-viscosity oils, and increase with higher-viscosity oils. The surface damages on the drawn cups are observed with the optical interference microscope. The amount of metal transfer of worked materials adhered to the drawing die under the identical drawing speed is the greatest degrees with ISO VG2L of the lowest oil in this experiment, and decreases with increasing the viscosity of oils.View full abstractDownload PDF (1248K) -
Shuhei OHSAKI, Yo KOJIMA, Tsuneo TAKAHASHI1983 Volume 33 Issue 10 Pages 579-587
Published: October 31, 1983
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe stress-corrosion crack (SCC) growth behavior of 7N01 alloy in NaCl aqueous solution was investigated electrochemically and metallurgically. Using the compact DCB specimen technique, SCC growth-rate in short-transverse direction was determined as a function of aging treatment, solution pH and electrode potential. The results suggest that SCC propagation process is principally controled by localized anodic dissolution along grain boundary which may proceed in respects of local decrease in pH within the crack and resulting passive film rupture. It is found that the second phase particles on grain boundaries, causing exfoliation corrosion, play the role as the effective sites of cathodic reaction, which controles the anodic reaction, and accelerate SCC propagation.View full abstractDownload PDF (2511K) -
Tetsuji IWAMA, Katashi KATSUMATA, Koji MITAMURA, Yo TAKEUCHI1983 Volume 33 Issue 10 Pages 588-595
Published: October 31, 1983
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSThe effect of electrolytic etching on the adhesive strength of epoxy-phenolic resin to aluminum was investigated by measurements of peel strength and SEM-observation of aluminum surface. Electrolytic etching increased the peel strength of resin to aluminum. It was presumed that the main factors which influenced peel strength were the surface roughness, the area of flat part with sub-microscopic pores whose size was about 1000Å_??_, the number of pores, the presence of facet-like plane located in concave part and smut.
In order to clarify the influencing factors, we examined how the surface of aluminum was changed by chemical treatment after electrolytic etching. Chemical etching was achieved to remove smut or to resolve surface of aluminum. It was clarified that the smut on the surface of aluminum decreased peel strength extremely and facet-like plane did not influence peel strength so much. Peel strength was increased by the presence of many sub-microscopic pores and flat parts around concave surface. Peel strength of epoxy-phenolic resin to electrolytically etched aluminum was superior to that of conventional surface treatments such as Cr3+ or Cr6+ chromate and boehmite.View full abstractDownload PDF (1437K) -
Akira KITAHARA, Shigeru AKIYAMA, Hidetoshi UENO, Sumio NAGATA, Koji IM ...1983 Volume 33 Issue 10 Pages 596-601
Published: October 31, 1983
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSA hollow volcanic glass microspheres (Shirasu Balloons)/aluminum composite(SBAC), which is useful in application for its lightness, compressive strength, and damping capacity, was prepared by forcing molten Al-12Si alloy into the mold filled with Shirasu Balloons or a mixture of Shirasu Balloons and the alloy powder. Its thermal expansion was measured on both heating and cooling, over the temperature range between 20°C and 500°C. A thermal expansion hysteresis was observed when the maximum temperature in a thermal cycle rose above 100 °C. It was caused by the stress developed as a result of large difference in the expansion coefficients of body constituents. The amount of hysteresis increased as the difference increased or the maximum temperature rose.
On the other hand, the thermal expansion coefficient of SBAC between 20°C and 100°C showed good agreement with Turner's equation, derived on the assumption that each constituent is constrained to change its dimension at the same rate as the composite with temperature.View full abstractDownload PDF (536K) -
Katsuyuki YOSHIKAWA, Toshimasa SAKAMOTO1983 Volume 33 Issue 10 Pages 602-609
Published: October 31, 1983
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSThe formation mechanism of giant intermetallic compounds in the solidification of the Al-Mn alloys, corresponding to the 3004 alloy, has been investigated. Giant intermetallic compounds were found to be of a MnAl6 phase into which Fe dissolved, and they precipitate as primary crystals prior to the precipitation of α-Al.
The primary precipitation line and the precipitation temperature, TM(°C), of the MnAl6 phase are represented by %Fe+1.07%Mn=1.707(at 650°C)and TM=591.2+34.4(%Fe+1.07%Mn), respectively.
The influence of Mg on the primary precipitation line is found to be rather small by comparing the equilibrium diagrams of the 3004 alloy and the ternary AI-Mn-Fe alloy system.
The behavior of these compounds in continuous casting was also investigated and compared with the above equations. Applying these equations, it is possible to predict and prevent the occurrence of the primary MnAl6 phase during continuous casting.View full abstractDownload PDF (990K) -
Masahiro TAKESHIMA, Makoto SUGAMATA, Junichi KANEKO1983 Volume 33 Issue 10 Pages 610-617
Published: October 31, 1983
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSThe stretch formability of age-hardening aluminum alloys has been studied by the hydraulic bulging test for 2036, 6061, 6009 and 7N01 alloy sheets under various heat treating conditions. In contrast to the deep drawability, the stretch formability of these alloys lowers with the progress of age-hardening. The maximum bulging height is closely correlated to the total elongation and n-value by the tensile test. A decrease in the maximum bulging height is larger for the materials aged at higher temperatures in which the total elongation and n-value are appreciably decreased. In 2036 alloy, the T4 and low temperature aged materials show higher forming limit strains than the annealed material, whereas the highest forming limit strain is obtained for the annealed material of the other tested alloys. Among the tested specimens of these four alloys under various heat treating conditions, the highest stretch formability is obtained for the annealed materials of 6061 and 6009 alloys, to which the as solutionized materials of these two alloys are second. The T4 and low temperature aged materials of 2036, 6061 and 6009 alloys can be stretch-formed to the nearly the same limit strain, which is higher than that of 7N01 alloy.
The 7N01 alloy sheet has the lowest stretch formability among the four tested alloys in all respects.View full abstractDownload PDF (505K) -
Yoshio BABA, Yoshihiko NISHIMURA1983 Volume 33 Issue 10 Pages 618-631
Published: October 31, 1983
Released on J-STAGE: November 05, 2008
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Seijiro MAKI, Mitsuo NIINOMI, Masao NAKAMURA, Toshiro KOBAYASHI1983 Volume 33 Issue 10 Pages 632-646
Published: October 31, 1983
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSDownload PDF (966K)
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