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Volume 35, Issue 1
Displaying 1-9 of 9 articles from this issue
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Ichiro NAKAYAMA1985 Volume 35 Issue 1 Pages 1
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (180K) -
Minoru FURUKAWA, Akihiko MATSUI, Yasuhiro MIURA, Minoru NEMOTO1985 Volume 35 Issue 1 Pages 3-11
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDeformation induced substructures of aged Al-Li alloys containing coherent δ'-L12 ordered particles were studied by dark field transmission electron microscopy. Dislocations move as pairs when fine scale precipitation of δ'-particles occurs. The form and distance of pair dislocations strongly depends on the size and distribution of particles. Particles having the diameters less than apporoximatery 50nm can be sheared by dislocation pairs. When the particles grow larger, dislocations by-pass the particles leaving the dislocation loops around them. Basing upon the observed behavior of dislocations, strengthening mechanisms in the Al-Li alloys were discussed taking into account the various resistances to the dislocation movement in the alloys. Main contributions to the strength of the alloy come from the energy of antiphase boundary and the frictional stress in the ordered particles. The measured yield strength and observed arrangements of deformation induced dislocations well agree with the theoretical proposal.View full abstractDownload PDF (2299K) -
Junichi KANEKO, Makoto SUGAMATA, Masahiro TAKESHIMA1985 Volume 35 Issue 1 Pages 12-19
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSSheet formability tests of the deep drawability, bulging height and forming limit curve, were carried out for 3003 and 3004 aluminum alloy sheets in which heat treating conditions for MnAl6 precipitation and amount of remaining work-hardening were varied. Obtained results were discussed in relation to the tensile properties and crystallographic textures. In 3003 alloy specimens, the maximum values of limiting drawing ratio (LDR) were obtained for the partially annealed specimens with some amount of ramaining work-hardening. Annealed soft material of this alloy does not show the highest LDR because of formation of the cubic textures. In contrast, Otempered material shows the highest LDR in 3004 alloy. In both alloys, the maximum bulging height and forming limit strains increase with decrease of tensile strength and with increases of total elongation and n value. In 3003 alloy sheets, the optimum tempering condition for deep drawing is different from that for stretch forming.View full abstractDownload PDF (1038K) -
Tetsuyuki IKEDA, Seiki NISHI, Hitoshi HANYU1985 Volume 35 Issue 1 Pages 20-28
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSWater spray cooled stationary mold casting, water spray cooled movable mold casting and water cooled copper mold casting were tentatively applied to achieve homogeneous dispersion of Pb phase in an Al-8%Pb-4%Si alloy. Casting the alloy into a spray cooled stationary mold 10mm in height and 35mm in diameter at 900°C just above the L1+L2 separating temperature and cooling at a rate 15°C/s result in homogeneous distribution of Si and irregular shaped Pb phases up to 20μm in size. Casting into a water cooled copper mold 80mm in length, 15mm in width and above 8mm in thickness at 850°C just below the L1+L2 separating temperature and cooling at 100°C/s or less result in homogeneous dispersion of spherical Pb about 20μm in diameter. And casting at 900°C into the water coled coopper mold 5mm and 2mm in thickness and cooling at about 300 and 600°C/s respectively result in homogeneous dispersion of irregular-shaped Pb up to 10μm and spherical Pb about 5μm in size respectively. Gravity segregation of Pb is prevented in these casting processes.View full abstractDownload PDF (2194K) -
Toshimitsu UCHIYAMA, Eizo ISOYAMA, Hiroichi TAKENAKA, Yutaka KATO1985 Volume 35 Issue 1 Pages 29-33
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAluminum foils 100μm in thickness were hydrated in deionized water at different temperatures for different times. The hydrated foils were bonded onto low density polyethylene sheets 2mm in thickness at 200°C under 0.9MPa for 3s. The adhesion was evaluated on the basis of peeling strength at peel angle 180°C. The higher the hydration temperature, the sooner hydration reaction takes place. The hydrated oxide film grows rapidly in the initial stage and more slowly as the hydration treatment proceeds. The oxide film formed on aluminum surface becomes thinner and finally disappears as the hydration treatment proceeds. The adhering characteristics go through three stages in the course of hydration treatment. The bonding strength is constant at the initial stage, considerably weak at the second stage and high at the final stage. When examing the broken portions in peeling, it is important to consider about not only properties of the hydrated oxide film but also the transforming manner of oxide film on aluminum surfaces.View full abstractDownload PDF (1027K) -
Toshihiko OKA, Kazuhiko TAKE, Yoritoshi MINAMINO, Keiichi HIRAO, Toshi ...1985 Volume 35 Issue 1 Pages 34-40
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of aging on the failure time in stress corrosion cracking of Al-5.3Zn%-1.4wt%Mg alloy was studied by the Weibull distribution method. All test pieces were solution heat treated at 460°C for 1h and quenched into ice-water. Some of them were aged in three different ways, i) at 120°C for 2 days, ii) at 100°C for 3 days and iii) at 80°C for 4 days. The others were preaged at room temperature for a week and aged in the ways above mentioned. The test pieces were stress corrosion tested under constant applied stresses 80, 60 and 40% of the yield stress in 3.5%NaCl+0.2%H2O2 solution of pH4.0. The failure time obeys the single Weibull distribution with a location parameter. Shape parameters of Weibull distribution for the failure time are nearly unity under the applied stress 80% of the yield stress, but are larger than unity under those 60 and 40% of the yield stress. Aging temperature dependences of the mean and median failure times indicate that split aging prolongs the failure time. The longest failure time is achieved for the test pieces split aged at 120°C.View full abstractDownload PDF (1167K) -
Tsuneo TAKAHASHI, Tatsuo SATO1985 Volume 35 Issue 1 Pages 41-49
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSHardness measurements, Laue method X-ray diffraction and high resolution electron microscopy were made on Al-4%Cu-1.5%Mg alloy (Al-S pseudo-binary alloy). The alloy is extremely age-hardened in the temperature range 0° to 200°C even at low temperatures 0° to 50°C. Both the rate of initial hardening and maximum hardness depend on such quenching conditions as water quenching, direct quenching and step quenching. The extremely high age-hardenability is caused by fine G.P.B. zones which are separated into two types, i.e. G.P.B. (1) zones in the initial stage of aging and G.P.B. (2) zones in the later stage. The former has the structure of random atomic arrangements within the zone, and the latter is considered to have the structure of highly ordered atomic arrangements.View full abstractDownload PDF (3074K) -
Kazuhiko ASANO, Akira MIYAGAMI, Yasutaka ARII1985 Volume 35 Issue 1 Pages 50-56
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
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Kentaro MIZOGUCHI1985 Volume 35 Issue 1 Pages 57-67
Published: January 31, 1985
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (3439K)
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