巻号一覧
37 巻, 2 号
選択された号の論文の12件中1～12を表示しています
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木村 啓造1987 年 37 巻 2 号 p. 101-102
発行日: 1987/02/28
公開日: 2008/07/23
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世利 修美, 田頭 孝介1987 年 37 巻 2 号 p. 103-108
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーDifferences in corrosion weight loss of Al-Fe alloys causing of degree of presence of dissolved oxygen are discussed by measuring the 103h immersion corrosion test and electrochemical methods in NaCl solution. Fe(II) ion produced by dissolution of intermetallic compounds is oxidized into stable product Fe(OH)3 by aeration. Corrosion of Al-Fe alloys is accelated by redox reaction between Fe(II) and Fe(III) ion in deaeration.抄録全体を表示PDF形式でダウンロード (683K) -
神尾 彰彦, 手塚 裕康, 鈴木 聡, Trong Long Than, 高橋 恒夫1987 年 37 巻 2 号 p. 109-118
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーAl-8 mass%Fe, Al-8 mass%Fe-0.7 mass%Zr, Al-8 mass%Fe-2 mass%Ce and Al-8 mass%Fe-2 mass%Ce-0.7 mass%Zr alloys were solidified into a ribbon shape at cooling rate of about 105°C/s by twin roller technique. Assolidified microstructures have two categories, zone A and zone B depended on the cooling rate. Zone A composed of fine metastable intermetallic compounds dispersed in supersaturated Al solid solution. Zone B had cellular structure and cell bounderies composed of fine metastable compounds Al6Fe in Al-Fe and Al-Fe-Zr alloys and stable compound Al8CeFe4 in Ce added alloys. The Vickers hardness of two zones in Al-8 mass%Fe binary alloy are reduced by heating at 350°C for 1 hr, but in Ce or Zr added ternary alloys the hardness are reduced by heating at higher temperatures than 350°C. Tensile strengths of the as-solidified ribbon specimens are about 58kgf/mm2 in Zr added alloy and about 63kgf/mm2 in Zr and Ce added alloy, and they depend on the fraction of zone A and zone B.抄録全体を表示PDF形式でダウンロード (5382K) -
当摩 建, 麻野 雅三, 竹内 庸1987 年 37 巻 2 号 p. 119-126
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーEffects of chemical composition and cold reduction on sagging resistance of Al-Mn alloys core brazing sheets were examined. Sagging resistance was controlled by recrystallization structure of the core during brazing. The best resistance was obtained in the sheets of about 30% cold reduction in which unisotropic coarser grains with no subgrain were formed. Zr addition in the core was effective to improve the resistance. Effect of the factors was discussed in terms of annealing characteristics. To obtain excellent sagging resistance full annealing temperature of the core has to be as high as possible, but to be lower than melting point of the cladding alloy.抄録全体を表示PDF形式でダウンロード (2906K) -
大西 忠一, 吉村 公一1987 年 37 巻 2 号 p. 127-133
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーFatigue tests of 7075-T651 aluminum alloy were carried out in laboratory air and in aerated 3.5%NaCl aqueous solution. In both S-N and da/dN-ΔK measurements, fatigue properties in NaCl were considerably inferior to those in air. A number of laminated cracks, which were intergranular cracks along pan-cake-like grain boundaries, were formed in a lower ΔK region in NaCl, while these were not observed in air at all. In an intermediate ΔK region the fracture pattern was characterized by formation of striations in both environments, but striations developed in air were "the ductile striations", and those in NaCl were "the brittle striations". In a larger ΔK region dimpled fracture area was gradually increased with increasing ΔK, although ΔK value at which dimpled fracture increased rapidly was lower in NaCl than in air. These differences between fatigue and corrosion fatigue can be understood through an effect of hydrogen permeated from the environment, and a lowering of corrosion fatigue properties seems at least partly to result from the localized hydrogen embrittlement. The more direct evidence for the contribution of hydrogen embrittlement to corrosion fatigue was obtained from the fact that the lowered fracture toughness of corrosion fatigued specimen was almost recovered to the original value by the re-heat-treatment after the corrosion fatigue test.抄録全体を表示PDF形式でダウンロード (2023K) -
松尾 守, 村松 俊樹, 梶山 毅, 小松 伸也, 立松 一穂, 村上 陽太郎1987 年 37 巻 2 号 p. 134-140
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーThe annealing property of A1050 sheet is strongly influenced by the intermediate annealing (I. Ann.) condition, especially by the heating rate and annealing temperature. Rapid heating and high temperature annealing will retard the recovery at final annealing (F. Ann.). This is the reason why the CAL (continuous annealing line) I. Ann. is superior to conventional batch type I. Ann. in resistance to softening by F. Ann. Specific resistivity measurements and chemical analyses of extracted intermetallic compounds showed that the softening behavior depends on the iron concentration in solid solution (CsFe) and that the CsFe after I. Ann. is a function of that before I. Ann., heating rate and I. Ann. temperature. The CsFe before I. Ann. will be kept almost constant on reaching the annealing temperature in case of rapid heating (salt bath). On the contrary, it will be decreased by precipitation during slow heating and re-solution will take place at temperature above 400°C in case of slow heating (20°C/Hr). Yield strength after F. Ann. (220°C × 5Hrs.) showed good corelationship with caluculated CsFe after I. Ann.抄録全体を表示PDF形式でダウンロード (1226K) -
前 健彦, 堀 茂徳1987 年 37 巻 2 号 p. 141-145
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーCreep-fracture behavior on polycrystalline aluminum coated with liquid Ga has been investigated. The results obtained are as follows, 1) The time to failure showed a minimum near the 0.2% proof stress. 2) The strain was no more than 12% at stresses lower than 60% of 0.2% proof stress, while it increased with increasing stress in higher stress range. 3) An area fraction of intergranular fracture-surface was 100% at stresses lower than 60% of 0.2% proof stress, while it decreased with increasing stress in higher stress range. 4) The rate of Ga penetration into grain boundary showed a maximum at the stress near the 0.2% proof stress. It is considered that the Ga penetration is enhanced by elastic deformation but that is suppressed propably by the slip band deformation.抄録全体を表示PDF形式でダウンロード (1399K) -
河野 紀雄, 佐久間 孝, 渡辺 久藤, 室町 繁雄1987 年 37 巻 2 号 p. 146-152
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーAn atempt to evaluate strontium modification effect was made by means of highly accurate thermal analysis for Al-12.6 to 13.3%Si alloys containing Sr up to 0.19% and optical microscopy. The arrest temperature on thermal analysis curves caused by eutectic reaction and the supercooling degree have close correlations with eutectic structures and are applicable as measures for routine evaluation of the modification effect. The difference in shape of thermal analysis curves corresponds to the difference in composition of the alloy in Al-Si-Sr ternary phase diagram. When 5 kg of molten Al-12.6%Si alloy containing Sr is held at 730°C, the modification effect remains for about 12 h.抄録全体を表示PDF形式でダウンロード (1526K) -
伊藤 吾朗, 歐 炳隆, 鈴木 壽, 菅野 幹宏1987 年 37 巻 2 号 p. 153-158
発行日: 1987/02/28
公開日: 2008/07/23
ジャーナル フリーAl-5.5%Zn-2.4%Mg-1.5%Cu alloy ingots containing 0.27%Cr or 0.13%Zr were subjected to different treatments, cold-rolled by 53%, solutionized at 470°C for 1 h, and then recrystallized structures were examined, mainly as a function of initial grain size (d0) and fraction recrystallized (f0). Numerical density of recrystallized grain generally increased with the increase in f0, as well as the decrease in d0, leading to the decrease in grain size after solutionizing. This phenomenon was explicable, assuming that boundaries between recrystallized and unrecrystallized regions, as well as so called grain boundaries, act as the nucleation sites for recrystallization. Marked grain refinement of solutionized specimens would be capable, if the treatment which decreases d0 and increases f0 is made in combination with over-aging before cold-rolling.抄録全体を表示PDF形式でダウンロード (2077K) -
根本 茂1987 年 37 巻 2 号 p. 159-175
発行日: 1987/02/28
公開日: 2008/07/23
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1987 年 37 巻 2 号 p. e1a
発行日: 1987年
公開日: 2008/07/23
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1987 年 37 巻 2 号 p. e1b
発行日: 1987年
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (46K)
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