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Volume 29, Issue 12
Displaying 1-9 of 9 articles from this issue
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Shiro SATO1979 Volume 29 Issue 12 Pages 539-540
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (306K) -
Yasuo SUZUKI, Shigeo ZAIMA, Takahide IEKUMO1979 Volume 29 Issue 12 Pages 541-548
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAlthough orthogonal wet cutting of hardened aluminum 1100-H18 ensures lowered cutting resistance and improved surface finish, that of softened aluminum 1050-O and 1100-O does not necessarily permit improved surface finish comparing with dry cutting. The viscosity of the cutting fluid has cosiderable effects on the cutting resistance and the surface roughness. Application of viscous machine oil lowers the cutting resistance, but does not improve the surface roughness. Application of spindle oil having low viscosity, on the other hand, leads to the cutting resistance not so improved and the surface roughness not so improved.View full abstractDownload PDF (1833K) -
Masahiro TAKESHIMA, Makoto SUGAMATA, Junichi KANEKO, Ken-ichiro AOKI1979 Volume 29 Issue 12 Pages 549-555
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe deep drawability, earing ratio, texture and hardness change by deep drawing were examined for 6061 aluminum alloy specimens age-hardened to various stages. Age hardening results in no or little decrease in the limiting drawing ratio (LDR), whereas work hardening of the same material is accompanied with its drastic decrease. In both age- and work-hardened materials, the LDR is shown to be correlated to total elongation and n-value, but not to tensile strength and r-value. Earing appeared in age-hardened specimens is nearly same as in the fully annealed or as quenched ones. The hardness increase due to deep drawing is correlated to n-value. Deep-drawn products of higher strength and lower earing ratio with no or little decrease in the LDR are obtainable by using age-hardened 6061 alloy.View full abstractDownload PDF (839K) -
Masahiro TAKESHIMA, Makoto SUGAMATA, Junichi KANEKO, Ken-ichiro AOKI1979 Volume 29 Issue 12 Pages 556-562
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe deep drawability, earing ratio, texture and hardness change by deep drawing have been studied on 7N01 aluminum alloy specimens age-hardened under various conditions. The two-step aged materials show nearly the same deep drawability as the fully annealed or as quenched ones. The materials aged at room or lower temperatures show lower limiting drawing ratio (LDR). Work hardening of the same material is accompanied with a drastic decrease in LDR. The LDR is poorly correlated to tensile strength, total elongation, r- and n-values. The earing ratio is as high as 10% regardless of aging or annealing conditions. Compared with the fully annealed or as quenched materials, deep-drawn products of higher strength with little decrease in LDR are shown to be obtainable by using two-step aged ones.View full abstractDownload PDF (751K) -
Koichi KITAMURA, Eiichi SATO1979 Volume 29 Issue 12 Pages 563-567
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe galvanic current of the crevice specimen coupled to the free surface specimen was measured in a 0.5M NaCl solution at 25°C by means of a zero resistance ammeter. Variations of the potential and pH in the crevice with time were measured with a microelectrode and a pH-sensitive glass microelectrode respectively. A proposal is made on the behavior of crevice corrosion of aluminum alloys. Corrosion of the free surface of specimen is promoted by the crevice.View full abstractDownload PDF (574K) -
Tsuneo TAKAHASHI, Takeshi MURAKAMI, Mutsuhiro MIYAGAWA1979 Volume 29 Issue 12 Pages 568-574
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSTextures in half hard and soft hard 1100 sheets are strongly influenced by fraction of recrystallization of hot rolled sheets intermediately annealed. Formation of the texture with R-orientation is reduced as intermediate annealing is prolonged, while the cube texture is pronounced particularly in O tempered sheets at rolling reduction above 70%. When intermediately annealed to a fraction of recrystallization 25%, the texture with R-orientatoin and the cube texture in O tempered sheets balance with each other resulting in 45° and 0°-90° earing. These changes in texture are appreciable more readily by measuring (111) reflection intesityof R-orientation i.e. intensity of peaks nearest to the rolling plane normal in {111} pole figures than by measuring (200) reflection parallel to the rolling plane.View full abstractDownload PDF (969K) -
Hisashi SUZUKI, Motohiro KANNO, Yasuhisa SHIRAISHI, Kenzo HANAWA1979 Volume 29 Issue 12 Pages 575-581
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe aging phenomena of Al-1.2%Mg2Si alloys containing Cu up to 0.75% were studied by means of hardness, calorimetric and electric resistivity measurements, and transmision electron microscopy. The initial rate of aging at 175°C and the maximum hardness increase. Lowering of the strength due to "stored aging" is relieved as the additional amount of Cu is increased, because Q' phases of a quarternary compound also precipitate in the alloys containing Cu adding to needle-like G.P. zones.View full abstractDownload PDF (1677K) -
Yoshio BABA, Junichi KANEKO1979 Volume 29 Issue 12 Pages 582-597
Published: December 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (2023K) -
1979 Volume 29 Issue 12 Pages v
Published: 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (116K)
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