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Volume 37, Issue 3
Displaying 1-10 of 10 articles from this issue
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Seiichi NISHIKAWA1987 Volume 37 Issue 3 Pages 177-178
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
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Tsunemichi IMAI, Yoshinori NISHIDA, Mamoru YAMADA, Itaru SHIRAYANAGI, ...1987 Volume 37 Issue 3 Pages 179-184
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTensile strength and workability of Al/alumina short fiber composites fabricated by the high pressure casting method and cold rolled were investigated. The cold work of the composites was possible up to 20% of volume fraction of alumina fiber. The rate of the strength increase at the initial stage of rolling was large in high alumina fiber content composites and the limit of the strength increase was 21-22kgf/mm2 in all composites. The high temperature tensile strength decreased rapidly with temperature, and the strength also decreased to those of as-cast composites by annealing at 300°C. The increase in tensile strength seemed to be caused not by the degrees of fiber orientation, but by work hardening. The fracture strain of the composites decreased with volume fraction of fiber.View full abstractDownload PDF (1695K) -
Osami SERI, Kohsuke TAGASHIRA1987 Volume 37 Issue 3 Pages 185-191
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe effect of silicon on corrosion behavior of Al-Si alloys has been investigated by means of immersion corrosion test and electrochemical mesurements. The corrosion weight loss increased with increasing silicon content in Al-Si alloys. Corrosion of Al-Si alloys in aerated 0.1 M NaCl solution has been controlled by the cathodic process of water reduction which reacts on the eutectic silicon which is segregated.View full abstractDownload PDF (1638K) -
Susumu IKENO, Yasuaki FUKUMOCHI, Yasuhiro UETANI, Shizuo TADA1987 Volume 37 Issue 3 Pages 192-198
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe effects of grain size and Mn on ductility of Al-1%Mg2Si-0.4%Si base alloys were examined by tensile test.
When grain size was large as 600μm, elongation was slightly increased with increase of Mn at peak aged (200°C) condition of the alloys containing upto 0.5%Mn. While, if grain size was so small as about 50μm, elongation was almost independent of Mn in the alloys containing 0.20.8%Mn.
Although grain size varied from 50 to 600μm, intergranular fracture surface was always observed at peak aged (150 and 200°C) condition of 0.5%Mn addition alloys, which had the Mn bearing dispersoids of a mean diameter of 0.2μm.
The slip band spacing was decreased with decrease of grain size in 0.5%Mn addition alloys.View full abstractDownload PDF (2620K) -
Toshimasa MOROOKA, Eiji YUASA, Toshihiro SHU1987 Volume 37 Issue 3 Pages 199-206
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSMost of fiber reinforced metal are made by hot press or infiltration method. it is quite difficult to produce long products by either of the methods. If the powder rolling method can be used to make reinforced metal with continuous fiber, the range of the use of fiber reinforced products can be broadened and the economical benifit will be enhanced. In this study, the authors attempted to prepare fine wire reinforced aluminum plate by using the powder rolling method. Mechanical properties of the plate were investigated and the suitability of this process was appraised. The results obtained in this study can be summarized as follows: (1) It is possible to prepare the reinforced plate by using powder rolling method. (2) The tensile strength of the plate increased with increasing of the volume fraction of the wire and its value is reached to 300MPa at about 7% in volume fraction. (3) The Young's modulus of the plate increased with increasing of volume fraction of the wire and these values agreed with those calculated from the rule of mixing. (4) The density of the plate increased with increasing of the volume fraction of the wire. (5) The heat resistance of the plate is higher than that of the commercial aluminum.View full abstractDownload PDF (1692K) -
Mitsuhiro OHTAKI, Tetsuya NAGUCHI, Hideyuki UTO, Umewo HONMA, Shigeo O ...1987 Volume 37 Issue 3 Pages 207-213
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAE signals detected directly by use of the inserted wave guide in the final freezing zone of Al-220%Cu and Al-17%Si alloy castings solidifying in the I-beam type hot-tearing mold-were discussed on the basis of the formation process of hot-tearing. Two types of AE signals are detected in the later stage of solidification. One is the continuous type corresponding with the solidification end and the formation of microcracks or shrinkage cavities formed at the grain interfaces. The other is the burst type corresponding with the propagation of the microcracks. On-line monitoring of hot-tearing may be possible when using a characteristic that numerous and grate amplitude AE signals in the early stage of solidification are shown in the solidifying test bar having remarkable hot-tearing.View full abstractDownload PDF (1539K) -
Osami SERI, Kosuke TAGASHIRA1987 Volume 37 Issue 3 Pages 214-219
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe electrochemical measurements and immersion corrosion test in 0.1 M NaCl solution has been carried out to examine the effect of chromium on aluminium. The weight loss of Al-Cr alloys was unaffected by content of chromium (0.151.09%). Corrosion morphology of Al-Cr alloys was a type of exfoliation corrosion. Corrosion behaviors of Al-Cr alloys were explaned by galvanic corrosion model which has three linear parameters, difference in corrosion potentials, resistances of anodic polarization and cathodic polarization.View full abstractDownload PDF (1031K) -
Yo KOJIMA, Yoshikazu MORITA, Naritoshi AOYAGI1987 Volume 37 Issue 3 Pages 220-227
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSStrength of adhesive boundary and critical aspect ratio in steel wires (φ 1.6 mm) reinfbrced 6063 alloys composites had been investigated by means of the steel wirer-drawing test. The drawing test from the matrix metals were carried out with the specimens which had the various lengths of steel wire in 6063 alloys. The shear strength of adhesive boundary in the specimens treated in the T5 condition (180°C, 4 hr aging) increased by the T6 treatment (540°C, 1 hr→160°C, 24 hr aging). At the same time the critical aspect ratio in the T5-specimens decreased by the T6 treatment. The solid solution heat treatment improved the strength of adhesive boundary in those composites, and the intermetallic compound at the boundary was observed in the specimen which had been treated at 540°C for 24 hr.View full abstractDownload PDF (1744K) -
Kazuyoshi SHIMAKAGE, Yuji YAMAMOTO, Kyoko TAMAI, Tatsuhiko EJIMA1987 Volume 37 Issue 3 Pages 228-238
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe purification behaviors of liquid aluminiums containing impurity elements have been investigated by means of segregation process which utilizes segregation phenomena of solute in the solidification of liquid metal. After liquid aluminium was unidirectionally solidified under the conditions of ultrasonic vibration and mechanical stirring, the distribution of impurity concentration was examined against the solidified length. Copper, Magnesium and iron in liquid aluminium were used as impurity elements. The experimental results obtained are summarized as follows:
(1) For each aluminium alloy, the distribution of impurity concentration after the solidification was dependent on initial impurity concentration in liquid aluminium. These behaviors could be explained by the variation of the shape in the solid-liquid interface which is presumed by constitutional supercooled theory.
(2) When aluminium alloys containing low impurity were solidified with the conditions of ultrasonic vibration and mechanical stirring, the purification of aluminium alloys proceeded in accordance with theoretical solidified curve.
(3) The effects of ultrasonic vibration and mechanical stirring on the purification of aluminium alloys having the concentration of high impurity were larger than those of aluminium alloys containing low impurity. These results may suggest that the solid-liquid interface during the solidification is fully mixed with ultrasonic vibration and mechanical stirring and impurity elements escaped from the solid transfers easily to bulk layer in melt.View full abstractDownload PDF (1810K) -
Shigeru NEMOTO1987 Volume 37 Issue 3 Pages 239-253
Published: March 31, 1987
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (4008K)
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