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Volume 23, Issue 10
Displaying 1-6 of 6 articles from this issue
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Tsuneo TAKAHASHI, Masaoki HASHIMOTO, Takeshi MURAKAMI1973 Volume 23 Issue 10 Pages 425-429
Published: October 30, 1973
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effects of the magnesium content, the rolling temperature and the rolling reduction on polycrystalline aluminum were studied. When the rolling reduction was 95%, the rolling texture of polycrystalline aluminum changed gradually from the copper type to the brass type as the magnesium content increased. The lowering of rolling temperature favored the component of the brass type texture. This was significant in the Al-Mg alloy. At 50% reduction, the main component of the rolling texture in pure aluminum and an Al-3%Mg alloy was {112} <111>. However, when the reduction was larger than 50%, the orientation in aluminum and the Al-Mg alloy tended to approach to {146} <211>. The transition from {112} <111> to {146} <211> occurred in the smaller reduction in the alloy than in pure aluminum.View full abstractDownload PDF (2161K) -
Tsuneo TAKAHASHI, Masaoki HASHIMOTO, Takeshi MURAKAMI1973 Volume 23 Issue 10 Pages 430-436
Published: October 30, 1973
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSEffect of magnesium on the formation of rolling textures of aluminum was studied by comparing orientation changes of aluminum and Al-3%Mg alloy single crystals during rolling. When the primary and the conjugate slips were operative, the orientations of both aluminum and Al-3%Mg crystals tended to become {011} <211> as the rolling reduction increased. At the higher reduction, the rolling plane normal of the aluminum crystals spread toward the cross slip plane normal because of the effective operation of cross slip. However, the rolling plane normal of the Al-3%Mg crystal approached completely to <011> by the operation of the normal slip mode. When both the rolling plane normal and the rolling direction lied near the <011> great circle, the {112} <111> orientation was stable in the aluminum crystal, while the {112} <111> orientation of the Al-3%Mg crystal was unstable and tended to rotate to the {011} <211> orientation.View full abstractDownload PDF (3685K) -
Tadakazu OHNISHI, Yoshizo NAKATANI, Kyoji SHIMIZU1973 Volume 23 Issue 10 Pages 437-443
Published: October 30, 1973
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe phase diagram in the solid state of the Al-Mg-Mn-Cr alloys at 550°C was studied in the range where the maximum contents of Mg, Mn, and Cr were 5%, 10%, and 8%, respectively. The identified phases were the α solid solution, MnAl6, θ(CrAl7), E(Mg3Cr2Al18) and G[(Mn, Cr)Al12] Sections for 1%, 3% and 5%Mg as well as the three dimensional sections were obtained: The section for 1%Mg, similar to that for the Al-Mn-Cr ternary system, was composed of the α solid solution, (α+MnAl6), (α+MnAl6+G), (α+G), (α+θ+G) and (α+θ) fields. In addition to two 4-phase fields, (α+MnAl6+E+G) and (α+θ+E+G), the α solid solution, (α+MnAl6+E), (α+E+G), (α+θ+E) and (α+E) fields were found in the section for 3%Mg.The section for 5%Mg was composed of four fields, the solid solution, (α+MnAl6), (α+MnAl6+E) and (α+E).View full abstractDownload PDF (4680K) -
Shiro SATO1973 Volume 23 Issue 10 Pages 444-451
Published: October 30, 1973
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSBending test of aluminum alloys were performed and the following results were obtained:
1) In order to obtain the bending characteristics of very wide materials, the specimen width was at least 9 time of the thickness.
2) The bending strain at the center of test pieces reached the maximum at a certain bend angle, defined as the required minimum bend angle, θrm, over which the bending strain at the center remained constant. It was believed that cracks had been formed before θrmwas attained. As the ratio of the mandrel radius to the test piece thickness, R/T, increased, θrm decreased. In the case of 5083-0 or 7N01-T6 alloys, cracks were not formed below θrm which was about 115° for R/T of 0.9. However, when R/T were 2.0 and 3.0, θrm were 85° and 60° respectively.
3) The strain distribution in the guided bending test was almost identical to that in the roller bend test, when R/T was constant. Therefore, it was suggested that the guided bending test of the butt-welded specimens could be replaced by the roller bending test.View full abstractDownload PDF (3753K) -
Hisashi SUZUKI, Shigenori ASAMI, Motohiro KANNO1973 Volume 23 Issue 10 Pages 452-456
Published: October 30, 1973
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAging phenomena in Al-Zn-Mg alloys having 5.5wt% of (Zn+Mg) and ranging from the (α+T) to the (α+η) phase region were investigated by means of hardness, electrical resistivity and specific heat measurements and transmission electron microscopy. Six alloys were solution treated at 470°C for 1hr, quenched into iced water and aged at various temperatures between 50 and 150°C. The results obtained were as follows: The tendency that the initial aging rate increased with the increasing ratio of Zn/Mg was clearly observed in the (α+T) type specimens. However, the initial rate in the (α+T+η) and the (α+η) type specimens was nearly the same as that in the (α+T) type specimen with high Zn contents. As the ratio of Zn/Mg increased, all the specimen tended to be overaging. Therefore, the (α+T) type specimen developed the largest hardness when it was aged between 125 and 150°C. Electron micrographs as well as selected area diffraction patterns showed that nearly the same intermediate phase, η', appeared in all the specimens.View full abstractDownload PDF (3214K) -
Hiroaki NAKAGAWA1973 Volume 23 Issue 10 Pages 457-469
Published: October 30, 1973
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (7438K)
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