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Volume 42, Issue 7
Displaying 1-9 of 9 articles from this issue
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Gaohui WU, Norio KONO, Tsuneo TAKAHASHI, Hisafuji WATANABE1992 Volume 42 Issue 7 Pages 377-382
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSMixing law for expressing strength of composite materials reinforced by SiC whiskers and Al2O3 particles was investigated based on the results in tensile tests of them. It is found that the average length of SiC whiskers after extrusion is exponentially decreased with the increase in volume fraction of whisker. The regressive expression of the relationship between average length and volume fraction of whiskers is proposed. It is also found that a maximum value in the tensile strength of these materiales appears and varies as the strength and the volume fraction of whiskers and the strength of matrix. Therefore, an optimum combination of strength of whisker and matrix, and an optimum content ratio of whiskers and particles exist respectively.View full abstractDownload PDF (708K) -
Isao ITOH, Yasuo OTOGURO, Hiroaki SAMATA1992 Volume 42 Issue 7 Pages 383-388
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSEffects of Sn or/and Mg addition on the diffusion weldability of aluminum alloy were investigated. The welding treatment was carried out in the temperature range from 573 to 873K for 1.8, 3.6 and 7.2ks under the pressure of 1, 2 and 4MPa in the atmosphere, respectively. The liquid Sn containing Mg filled the interface and prevented the interface from an attack of the air which oxidized the surfaces of specimens. Mg in the liquid Sn reduced a part of the oxidation film at the interface. Both Sn and Mg addition showed the almost same shear strength as that of AI-Mg alloy, which was remarkably higher than that obtained by the single addition of Sn.View full abstractDownload PDF (1816K) -
Keizo SAKURAI, Katsushige ADACHI, Koichi OGAWA, Ralph NIBA1992 Volume 42 Issue 7 Pages 389-394
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSTitanium have chemical reactivity, high affinity and low heat conductivity. These properties are responsible for the poor machinability of tiatanium alloys. In the drilling of titanium alloys the suitable materials, shape of cutting portion and cutting conditions have not found out nowadays. The cutting forces on TiN coated cobalt high speed steel drills and oxide-treated nitridized cobalt high speed steel drills in the drilling Ti-6Al-4V alloy and effect of the step feed on the performance of both drill types with respect to cutting characteristics (cutting force, tool wear, tool life and burr shape) were investigated. In the conventional drilling the cutting forces on TiN drills increase as cutting speed increases and at a cutting speed of 900rpm the torque on TiN drills rapidly attains a value twice that on COHS drills. In step feed drilling, cutting forces on TiN drills are generally lower than in conventional drilling and are also lower as compared to the forces acting on COHS drills.View full abstractDownload PDF (1005K) -
Mitsuaki FURUI, Takashi KASAHARA, Yo KOJIMA, Mamoru MATSUO1992 Volume 42 Issue 7 Pages 395-399
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe fundamental operation technique for the electromagnetic casting (EMC) was investigated. The vertical sides of the obtained small size ingot were straight without surface defects. The meniscus shape was generally controlled by the screen of a metal ring (such as SUS) in the EMC and was previously reported by Mayer et al. on the basis of experiments and calculations. In this work the diameter of horizontal cross section of an ingot was altered by changing the number of the external coil with the same electromagnetic conditions. After determination of casting conditions for producing a pure aluminum ingot with excellent surface appearance, ingots of 5182 aluminum alloy were fabricated under the identical conditions and their microstructures were observed.View full abstractDownload PDF (966K) -
Yasuhiro UETANI, Kouki OZAKI, Kenji MATSUDA, Hiroshi ANADA, Shizuo TAD ...1992 Volume 42 Issue 7 Pages 400-406
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAge-hardened Al-1mass% Mg2Si-0.4mass%Si alloy specimens were deformed in tension. The displacement of scratch lines and the steps at grain boundaries were observed. The relationship between deformation inside grains and displacement of scratch lines was investigated by determining orientations of an individual grain using a SEM-ECP method. Folds observed near triple points of grain boundaries were further investigated. In the high temperature creep deformation of an Al-Mg alloy, the grain boundary sliding is proposed to be caused by deformation inside grains if the slip bands are continuous across grain boundaries. Similar slip bands were partly observed in the present Al-Mg-Si alloy. No remarkable difference in the slip systems were observed between solution-treated and age-hardened specimens. Folds observed in this work were roughly classified into two types besed on their morphologies: one was a sharp and straight fold and the other was a diffuse and broad fold. The former and the latter folds were considered to be formed by slip and kink mechanisms.View full abstractDownload PDF (1242K) -
Osami SERI1992 Volume 42 Issue 7 Pages 407-410
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAn attempt is made to explain the experimental evidence that a peak value of anodic current density occurs at about -0.95V vs. Ag/AgCl in the anodic polarization curves of Al-Zn alloy specimens in deaerated 0.1M NaCl solution. It was found that this can be explained in terms of the anodic reaction which is oxidation of zinc element in the Al-Zn alloy specimen to zinc hydroxide.View full abstractDownload PDF (419K) -
Takashi ARAI1992 Volume 42 Issue 7 Pages 411-417
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (739K) -
Akira KOHYAMA, Shinji SATO, Kenji SAKA1992 Volume 42 Issue 7 Pages 418-426
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (2509K) -
Kiyoshi SEKIGAWA1992 Volume 42 Issue 7 Pages 427-428
Published: July 30, 1992
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (226K)
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