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Volume 32, Issue 9
Displaying 1-8 of 8 articles from this issue
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Tatsuhiko EJIMA1982Volume 32Issue 9 Pages 441-442
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (260K) -
Chozo YOSHIMURA, Toshiaki OGURA1982Volume 32Issue 9 Pages 443-450
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSElectrode potential and weight loss of aluminium and magnesium in ethers were measured. Aluminium and magnesium are uncorroded in non-polare ethers such as diethylether, anisole, 1.4-dioxane and tetrahydrofurane, but are corroded in ethers containing alcohlic hydroxy radical such as 2-methoxy, 2-ethoxy and 2-butoxyethers. Aluminum does not react on coexisting water, but magnesium is corroded with water forming hydrated compounds.View full abstractDownload PDF (1272K) -
Eiichi SATO, Kazuo TACHIHARA, Toru HORIKOSHI1982Volume 32Issue 9 Pages 451-457
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe anodic polarization behavior and time dependence of anodic current of 99.999% aluminum in 0.5M NaCl solution were examined. Pitting corrosion of super high purity aluminum in 0.5M NaCl at pH 8.5 is caused by Cl- which permeates cracks at the interface of the surface film and a rhombic corrosion product. This corrosion product mainly composed of Al, Fe and Si is formed at less noble potentials than the pitting potential. The pitting corrosion is affected by chemical dissolution in 0.5M NaCl solution at pH 10, and the pitting potential becomes noble. The limiting current in the anodic polarization curves is controled by diffusion of OH- in the solutions of pH 8.5 and 10. The corrosion potential of super high purity aluminum in 0.5M NaCl is about -0.76V at pH 4, -0.73V at pH 6, -0.72V at pH 8.5 and -0.72V at pH 10.View full abstractDownload PDF (1729K) -
Hiroshi MABUCHI, Yutaka NAKAYAMA1982Volume 32Issue 9 Pages 458-464
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTensile deformation and fracture behavior of a rapidly solidified Al-3wt%Mn alloy containing second phase particles at grain boundaries were investigated over a temperature range of room temperature to 500°C and a strain rate range of 5.2 × 10-55.2 × 10-3s-1. At 200°C and below, both strength and ductility are remarkably superior to those of the normally solidified alloy. At 300°C and above, ductility decreases markedly with elevated temperatures. Such a lack of ductility in the rapidly solidified alloy is always accompanied with intergranular fracture which may be caused by grain baundary sliding. The intergranular fracture is characterized by void nucleation at grain boundary perticles and by subsequent growth which occur preferentially at triple grain junctions or knees of grain boundaries.View full abstractDownload PDF (2477K) -
Keizo NANBA1982Volume 32Issue 9 Pages 465-472
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSSuch requirements for welding of BA 11 aluminum alloy tubes with 20 mm in external diameter and 0.8 mm in thickness as the V-shaped convergence angle, the power input of an oscillator tube and the girth reduction by squeeze rolls were examined. The requirements are not so critical. The wide convergence angle and the intermediate power input ensure high quality of the weld. Although the high girth reduction is recommended, excessive one causes such defects as misalignment and offset. The flash form is affected not only by heating conditions but also by upsetting conditions. It is also closely related to the weld quality. The flash form is an effective criterion for estimating these requirements and the weld quality.View full abstractDownload PDF (2662K) -
Hajime KATO, Tatsumi TOZAWA1982Volume 32Issue 9 Pages 473-478
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAlternate bending fatigue tests on the wrought and annealed magnesium alloy AZ21 were carried out. The annealed alloy has the fatigue strength higher than that of the wrought alloy as the number of cycles to failure increases. Cracks on the surface linearly propagate. Characteristic fractographs are taken, in which cracks propagate in different directions in particular grains. This tendency is more remarkable in the wrought alloy than in the annealed one. Such a fracture is attributed to the deformation mechanism in the stage where a plastic zone forms at a crack tip. The fracture accompanying deformation twins is composed of cleavage facets and steps of the twins.View full abstractDownload PDF (1992K) -
Ryotatsu OTSUKA1982Volume 32Issue 9 Pages 479-487
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
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Japan Magnesium Association, MWT Committee1982Volume 32Issue 9 Pages 488-501
Published: September 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (3757K)
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