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Volume 34, Issue 8
Displaying 1-8 of 8 articles from this issue
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Mitugu TOKIZAWA1984 Volume 34 Issue 8 Pages 437-438
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
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Ken-ichi MANABE, Hisashi NISHIMURA1984 Volume 34 Issue 8 Pages 439-445
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSContact pressure distribution in nosing and flaring of thin walled aluminum and copper tubes was measured by using pressure sensitive sheets to achieve the condition for reducing the contact pressure and for uniforming its distribution. The maximum contact pressure always arises near the contact boundary of tool inlet both in nosing and flaring. Contact pressure increases toward the end of tube except this region. Influences of tool semiangle, frictional coefficient and material properties such as n- and r-values on contact pressure were examined in detail experimentally and theoretically. Calculated values by membrane theory qualitatively agree with experimental ones except the region near the tool inlet both in nosing and flaring.View full abstractDownload PDF (1297K) -
Norihisa FUJII, Mitsuru FUJII, Shogo MORIMOTO, Senri OKADA1984 Volume 34 Issue 8 Pages 446-453
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSMechanical properties and microstructures of squeeze and gravity castings having different diameters from 30 to 140 mm were measured. As the diameter of squeeze and gravity castings is increased, mechanical proparties particularly of gravity castings lower. Elongation and impact strength are noticeably insensitive to diameter change. Squeeze castings have dendrite cell size about two third of that the gravity castings have. Eutectic Si particle size in squeeze castings is unaffected by diameter change. The solidification time for both castings are proportional to (V/S)2 in accordance with Chvorinov's law. The proportional constants of squeeze and gravity castings are 21.2 and 42.1 s/cm2 respectively. The solidification time for squeeze castings is about one half of that for gravity castings having the same diameter.View full abstractDownload PDF (2527K) -
Hideo YOSHINAGA, Yoshiro TOGAMI, Hiroaki KURISHITA1984 Volume 34 Issue 8 Pages 454-463
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSSeveral experiments including tensile, stress relaxation and stress change tests were conducted at temperatures from 623 K to 758 K and at strain rates from 3×10 -5 to 3×10 -3 s-1. The data were compared with those for binary Al-Mg alloys. The steady state flow stress in the commercial alloys is interpretable as the sum of solution hardenipg by dissolved Mg and Cu atoms and dispersion hardening by insoluble compound particles. The high temperature yield point phenomenon well-known in binary Al-Mg alloys is observed little or nothing. The reason may be a high multiplication rate of dislocations at an early stage of deformation compared with the binary alloys.View full abstractDownload PDF (1787K) -
Michio NANJO, Toshiharu KANAI, Yoshimasa ITOH, Kentaro TANIUCHI1984 Volume 34 Issue 8 Pages 464-471
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAlCl3-FeCl3-NaCl-KCl molten salt baths prepared by bauxite chlorination were treated by such dry processes as evaporation-condensation of FeCl3 and AlCl3 from the salt bath and as solidification-sedimentation in the molten salt. The greater evaporation of FeCl3 is found in the low melting point salt bath in which mole percentages of AlCl3 and FeCl3 exceed those of NaCl and KCl. Evaporation of AlCl3 greater than that of FeCl3 is confirmed in the high melting point salt bath with excess of NaCl and KCl. The alkali metal chlorides are heavily transfered from the molten salt with AlCl3. The best separation is achieved by solidification of iron components after reduction of FeCl3.View full abstractDownload PDF (1059K) -
Teruo KISHI, Yasuhide SAKAKIBARA1984 Volume 34 Issue 8 Pages 472-478
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA study on yield strength, especially on discontinuous yielding of dispersion hardened Al-Si single and polycrystals was carried out by tensile testing with the aid of acoustic emission signal analysis. 0.2% proof stress of the alloys is inversely proportional to the mean dispersed particle spacing, indicating that Orowan's dislocation bowing-out mechanism controls the yield strength. High acoustic emission activity, AE peak in yielding, is observed in the initial deformation region in dispersed alloys. Discontinuous yielding occurs in the region of high activity AE peaks. Emitted energy within an AE peak is inversely proportional to the square of mean particle spacing and corresponds to stored energy of bowing-dislocation between two isolated particles. Quantitative distribution of particle spacing in a specimen is evaluated by analyzing the AE peak in yielding using the relation above obtained between Orowan stress, particle size and acoustic emission activity.View full abstractDownload PDF (1016K) -
Tsuneo TAKAHASHI, Akihiko KAMIO, Hiroyasu TEZUKA, Shinji KUMAI1984 Volume 34 Issue 8 Pages 479-492
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
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Hideo KITAGAWA, Tetsuo UCHIMOTO, Satoshi NAGATA1984 Volume 34 Issue 8 Pages 493-502
Published: August 30, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (4130K)
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