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Volume 36, Issue 3
Displaying 1-9 of 9 articles from this issue
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Yoshio BABA1986 Volume 36 Issue 3 Pages 123-124
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
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Hideyuki KANEMATSU, Masazumi OKIDO, Takeo OKI1986 Volume 36 Issue 3 Pages 125-131
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe SCC of an Al-Zn-Mg alloy in 0.6N NaCl solution was studied by the potentiostatic SSRT (Slow Strain Rate Technique) in connection with its polarization behavior. The potential of the specimen was regulated in regions of pitting potential, unstable passive potential, and stable passive potential, which were predetermined from the polarization curve of the alloy in the same solution at 298K. The fracture surface of the specimen was observed by SEM (Scanning Electron Microscope), and the mechanism of SCC of the alloy was discussed. At the pitting potential, transgranular cracking initiates at the surface of the specimen, being followed by intergranular cracking inside of the specimen. And finally the specimen fractures mechanically, forming dimple pattern. At the passive potential, intergranular cracking occures at first. Dimple pattern is also in this case observed inside of the specimen. The transgranular cracking is considered as crack induced by pitting corrosion, and the intergranular cracking as rupture of the oxide film on grain boundaries.View full abstractDownload PDF (3179K) -
Hajime YAMADA, Takio TANAKA1986 Volume 36 Issue 3 Pages 132-136
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of fine particles precipitated during annealing and large dispersed particles of deformed primary inclusion on progress of recrystallization and generation of new grains were examined. Effects of primary inclusion particles are closely related to their interparticle spacing. The nucleation rate increases with decrease of the spacing. The increase of the rate of Al-Fe-Si alloys is, however, smaller than that of Al-Fe alloys. The particles of primary inclusion in the Al-Fe alloys are also effective to prevent the grain growth at high temperatures. This effect is also related to interparticle spacing of the particles. The interparticle spacing is related to the dendrite arm spacing, decreasing with decrease of the latter.View full abstractDownload PDF (793K) -
Taichi SATO1986 Volume 36 Issue 3 Pages 137-142
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDistribution isotherm has been determined for the extraction of gallium (III) and aluminum (III) from sodium hydroxide solusions by 7-(5, 5, 7, 7-tetramethyl-1-octen-3-yl)-8-hydroxyquinoline (Kelex 100, HQ) in kerosene under various conditions.
It is found that both metals are taken up, through a cation-exchange mechanism:
M(OH)4-(aq)+3HQ(org)_??_MQ3(org)+OH-(aq)+3H2O(aq)
where M=Ga and Al. Gallium (III) is confirmed to be separated effectivily by means of the solvent extaction of gallium and aluminum by Kelex 100 from aqueous solutions containing 0.1-6mol dm-3 sodium hydroxide, due to the large differents in the extractability and extraction rate by Kelex 100 for gallium and aluminum.View full abstractDownload PDF (584K) -
Toshio ENJO, Kenji IKEUCHI, Tsutomu HORINOUCHI1986 Volume 36 Issue 3 Pages 143-151
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe joint strength and the microstructure of the diffusion bonding of aluminum to titanium have been investigated using a variety of base metals: commercially pure aluminum A1050 (6×10-2mass%Si), nominally 99.99% (4N) aluminum (2×10-3mass%Si), and aluminum alloys containing 1×10-3 to 0.14mass%Si and 2×10-3 to 0.38 mass%Fe. The joint strength of 4N aluminum to titanium, which was much lower than that of A1050 to titanium, was increased significantly by introduction of Si into 4N aluminum by a diffusion treatment prior to the bonding. A marker experiment showed that an intermetallic compound layer consisting of Al3Ti grew from the bond interface into titanium for joints both with A1050 and with 4N aluminum. When the Si content exceeded 7×10-3mass%, a drastic decrease in the growing rate of this Al3Ti layer was found, suggesting that Si more than 7×10-3mass% reduced the amount of aluminum diffusing into the Al3Ti layer. The Fe content, however, had no correlation with the growing rate. The effects of Si on the joint strength and the growth of the Al3Ti layer can be accounted for by the decrease in the amount of aluminum diffusing into the Al3Ti layer.View full abstractDownload PDF (2095K) -
Yoshiei SHINADA, Yoshisada UEDA1986 Volume 36 Issue 3 Pages 152-156
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA correlation between the distribution of silicon and hydrogen is recognized in the unidirectional solidified Al-16% Si alloy. The crystallized primary silicon crystals do not rise in the melt, and remarkably segregate at the lower part of a ingot in spite of having lower density than molten aluminum. The mechanism of segregation of silicon in Al-16%Si alloy is explained with the equilibrium phase diagram in the same manner as the formation of cylindrical pores in pure aluminum.View full abstractDownload PDF (1091K) -
Hisashi SUZUKI, Goroh ITOH1986 Volume 36 Issue 3 Pages 157-161
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSRecrystallized grain size, age-hardenability and quench-sensitivity have been examined for Al-4%Cu-1.5%Mg alloys containing chromium (0.10-0.49%), in comparison with the alloys containing manganese (0.30-1.28%). Coldrolled specimens were solution-treated at 500°C, and then subjected to different aging treatments. Recrystallized grain size of the alloy containing chromium (0.31-0.49%) is nearly the same as that of usual manganese contained alloy (0.64%). There is no difference in the age-hardenability at natural aging between the two sorts of alloys. However, the chromiun contained alloy is inferior in the age-hardenability at artifical aging and in the quench-sensitivity to the manganesec ontained alloy. These results are discussed in view of the differences in the density of insoluble compounds and the facility of loop formation mainly around the compounds.View full abstractDownload PDF (2692K) -
Tokuzou TSUJIMOTO1986 Volume 36 Issue 3 Pages 162-167
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
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Kensuke KURIHARA1986 Volume 36 Issue 3 Pages 168-187
Published: March 31, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (2206K)
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