All issues
Volume 31, Issue 3
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hiroshi MINO1981 Volume 31 Issue 3 Pages 149-150
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (364K) -
Masao KIKUCHI, Takeo YANAGI, Masao MIZUNO1981 Volume 31 Issue 3 Pages 151-156
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAl-4.5%Zn-1.2%Mg alloy welds were two-step aged. Hardness measurement, X-ray small angle scattering method and transmission electron microscopy were applied. The structures and hardness of the partially reverted region (II) and the unaffected region (III) in the Al-Zn-Mg alloy welds closely resemble each other by post-weld two-step aging. The hardness of the re-solution treated or reverted region (I) is lower than that of the region II or III in the alloy welds two-step aged. If preaging at room temperature is prolonged, the hardness of the region I approaches to that of the region II or III in the alloy welds two-step aged. When the alloy welds are 2nd stage aged at elevated temperatures, precipitates in these regions coarsen.View full abstractDownload PDF (1530K) -
Ken TOHMA, Yoshihiro SUGAI, Yo TAKEUCHI1981 Volume 31 Issue 3 Pages 157-163
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA new anodic dissolution method for rapid estimation of intergranular corrosion susceptibility of aluminum alloys has been proposed. The validity of the method is discussed in terms of electrochemical measurements and immersion tests on Al-Mg-Si and Al-Mg alloys. The precipitation heat treated alloys are susceptible to intergranular corrosion at the pit bottom. The probability of this type of corrosion is easily estimated by surface observation of the alloys after anodic dissolution test in deaerated 1N AlCl3 solution at the current density of 100 μA/cm2 or 1mA/cm2.View full abstractDownload PDF (2479K) -
Kinji SATO, Ryuichi MIYA, Kazuo OZAKI, Hiroaki NISHIMURA, Yasuhiro ISH ...1981 Volume 31 Issue 3 Pages 164-168
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA1100P-O and A1100P-H14 of 0.5, 1.0 and 1.5mm in thickness were punched with the die hole diameters of 10, 15, 20, 25 and 30mm. Cutout is generally completed after two steps of fracture. Cutout is impossible in the following three cases from various die thickness conditions. (1) Td>Dd, (2) Td_??_Dd and (3) Td_??_Dd, where Td is die thickness and Dd is die hole diameter. If Td_??_Dd, the primary fracture does not occur. The length of shear droop in the horizontal orientation on the edges of punched products is nearly equal to the sheet thickness. The ratios of fracture surface to sheet thickness of A1100P-O and A1100P-H14 are from 20 to 30% and from 30 to 40% respectively.View full abstractDownload PDF (990K) -
Mototsugu KATSUTA, Shiro KOHARA, Ken-ichiro AOKI1981 Volume 31 Issue 3 Pages 169-173
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSForming limit curves of 1050 aluminum sheets were determined and the effects of predeformation (cold rolling) on the curves were investigated. The forming limit curves of aluminum sheets shift to the lower position after cold rolling. The limit strain decreases to the greatest degree in the region near the plane strain deformation and to a smaller degree at the equibiaxial deformation side. The relation between the prestrain and the limit strain in the plane strain deformation was also investigated. The limit strain decreases with increasing prestrain. The second deformation causes the relaxation in work hardening due to the predeformation.View full abstractDownload PDF (551K) -
Kinji OMATA, Kimiyasu MAEDA, Takehiko ODA, Yoshihisa OTAKA1981 Volume 31 Issue 3 Pages 174-178
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSBehaviors of a paint vehicle near the anodic oxide film-paint interface in the baking process were studied by means of transmission electron micrography and Auger electron spectroscopy. Fibrous materials are found down to approximately 0.7μm in dcpth from the interface both in TEM and Auger spectroscopy on the painted and baked anodic oxide film. If the anodic oxide film on which an unbaked paint film preliminarily prepared has been mounted is baked, same the fibrous materials are also found. This fact is an evidence for penetration of the paint component down to 0.7μm in depth in the micropores in the baking process but not in the electrodepositing process. This will be true on the viewpoint of the electrodeposition mechanism and the particle size of paint against the micropores.View full abstractDownload PDF (1588K) -
Shigeo MUROMACHI, Mitsugu TOKIZAWA, Shizuo TADA, Hiroshi ANADA1981 Volume 31 Issue 3 Pages 179-185
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSHomogenized 6063 alloy billets having feather crystals (F.C.) and granular crystals (G.C.) were hot extruded with a 1500 ton press. Extruding conditions for the F.C. billet into extrusions having granular structure are established. When extruded at a low temperature 390°C, the mechanical properties, surface roughness and anodic film thickness of extrusions are nearly he same for F.C. and G.C. billet structures. The original cast structure (121) [111] in the F.C. billet still remains in the extrusions. When the F.C. and G.C. billets are extruded at an elevated temperature, the exrusions have typical orientations of cold-rolled aluminum sheets n (123) [211] and (130) [315]. A typical hot-rolling orientaion (110) [001] is also found in the extrusion of the G.C. billet. Both the extrusions of FC. and G.C. billets have nearly the same properties.View full abstractDownload PDF (865K) -
Kohei TOMITA, Hisanori TANIYAMA, Mamoru IMABAYASHI, Harero IWAMURA1981 Volume 31 Issue 3 Pages 186-194
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAnalysis of gases extracted from die castings were carried out. The effects of lubricant and casting temperature on gas volume in aluminum alloy die castings were examined. The effects of additional elements such as Si, Zn and Mg in pure aluminum were also tested. The extracted gas is mainly composed of hydrogen, carbon dioxide and nitrogen. Carbon monoxide is less than 1% in volume. The gas volume in die castings decreases with elevated casting temperature. It considerably decreases by coating the water lubricant containing bone ash powder. It increases with increasing Si content, but decreases with increasing Zn conent.View full abstractDownload PDF (1155K) -
Yoshio BABA, Hideo YOSHIDA1981 Volume 31 Issue 3 Pages 195-205
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (3986K) -
Ken-ichi HIRANO1981 Volume 31 Issue 3 Pages 206-216
Published: March 30, 1981
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1610K)
- |<
- <
- 1
- >
- >|