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Volume 33, Issue 3
Displaying 1-8 of 8 articles from this issue
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Ichiro TOMOHIRO1983 Volume 33 Issue 3 Pages 121-122
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
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Shigeo ZAIMA, Yasuo SUZUKI, Shigeru YAMADA, Masashi SUZUKI, Hiroshi HA ...1983 Volume 33 Issue 3 Pages 123-130
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDry cutting tests of hypereutectic Al-Si alloys were made using three types of carbide tools (P10, M20 and K10), CBN tool and sintered diamond tool. P10 carbide tool heavily wears with cutting time regardless of Si content in the alloys. K10 tool is only available for cutting Al-16 to 19%Si alloys at low cutting speeds. M20 tool has an intermediate feature and is unavailable. CBN tool shows light tool wear and is available for low speed cutting. Wear of the tool remarkably proceeds at accelerated cutting speeds because of a decrease in binding force of the alumina binder in CBN tool at elevated temperatures. Sintered diamond tool shows better wear resistance than CBN and carbide tools and is ready for use.View full abstractDownload PDF (2258K) -
Masakatsu SHIBATA, Seiki NISHI1983 Volume 33 Issue 3 Pages 131-136
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSMechanical properties of Al-4.5%Mg casting alloy containing various combinations of Mn up to 0.8%, Cr up to 0.5% and Fe up to 0.4% were measured at room temperature and -196°C. These alloying elements strengthen the alloy, but excessive contents of them result in crystallization of a number of intermetallic compounds and in decreases of the proof stress and ultimate tensile strength. Fe considerably lowers the elongation and Cr and Mn do in oreder. Fe0.25% or less, Mn0.3% and Cr0.3% are recommended for mechanical properties and corrosion resistance of the alloy, These contents should be lessened for the use at -196°C.View full abstractDownload PDF (1209K) -
Michihiro TAGAMI, Tadashi USAMI1983 Volume 33 Issue 3 Pages 137-141
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of heat treatment on the tensile strength, elongation, hardness and corrosion resistance of Zn-30.62%Al-0.9%Cu-0.047%Mg alloy pressure die casting were studied. Heat treatmcnt at 100°C for 100-240hrs and 150°C for 10hrs cause a decrease in tensile strength by 15 to 20% for as-cast alloys. Room temperature aging has no effect on2 the tensile strength, eleongation and hardness after 6480hrs (9 months). Corrosion resistance of as-cast pressure die casting in wet steam is not affected by heat treatment at 100°C for 240hrs and at 150°C for 10hrs. Pressure die castings have tensile strength and elongation smaller than that of gravity die castings, respectively by 12% in tensile strength and 88% in elongation.View full abstractDownload PDF (1746K) -
Akihiko KAMIO, Hiroyasu TEZUKA, Tsuneo TAKAHASHI1983 Volume 33 Issue 3 Pages 142-148
Published: March 31, 1983
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSThe minimum solute concentration in α-dendrite arms and the amount of the crystallized compounds were measured in Al-6.5%Mg alloys with the small amount of Fe, Mn and Ti solidified uni-and non-directionally. In the alloys solidified unidirectionally the minimum Mg concentration increases with the increase in average cooling rate during solidification and in the alloys solidified nondirectionally the opposite phenomenon to this is obtained. In the alloys solidified nondirectionally the nonequilibrium eutectic phase β crystallizes and the amount of β inorease with the increase in cooling rate. The amount of nonequilibrium eutectic phase βincreases with the increase in Mn concentration and the amount of crystallized compound Al (Fe, Mn) increases with the increase in Fe concentration. The minimum Fe concentration in the alloys solidified nondirectionally increases and the minimum Mn concentration is not affected with the increase in cooling rate, and the minimum Fe concentration decreases with tie increase in Mn concentration and remarkably with Ti addition.View full abstractDownload PDF (2039K) -
Hideo WATANABE, Koichi OHORI, Yo TAKEUCHI1983 Volume 33 Issue 3 Pages 149-156
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe structural changes in 3004 base alloys with commercial composition and higher Si or Mg content have been investigated by mainly optical microscopic observation and X-ray diffraction method. Heating led to the transformation of the coarse primary phase Al6 (Fe, Mn) into the equlibrium phase α-Al12 (Fe, Mn)3Si; so-called α transformation. TTT diagrams showed the C-curves having a nose near at 550°C. The activation energy for α transformation was estimated to be about 2.6eV. It suggests that the rate controlling process of α transformation is the diffusion of Mn atoms in Al matrix. In higher Si containing alloy, α transformation was accelerated, while, in higher Mg containing alloy, it was remarkably suppressed. The above results can be attributed to the differense of effective Si content for α transformation.View full abstractDownload PDF (2266K) -
Tsuneo ISHIMARU, Tatsuo MIURA1983 Volume 33 Issue 3 Pages 157-164
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
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Motohiro KANNO1983 Volume 33 Issue 3 Pages 165-175
Published: March 31, 1983
Released on J-STAGE: July 23, 2008
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