巻号一覧
26 巻, 5 号
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北川 二郎1976 年 26 巻 5 号 p. 217-218
発行日: 1976/05/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (268K) -
秋山 茂, 今川 耕治, 長田 純夫, 北原 晃, 上野 英俊, 徳広 祐之輔1976 年 26 巻 5 号 p. 219-224
発行日: 1976/05/30
公開日: 2008/07/23
ジャーナル フリーThere seem to be three essential factors in making Shirasuballoon-aluminum composite (SBAC) by the prepack and press method; they are the pressure of melt, the infiltrating speed of melt and the preheating tempera- ture of both melt and Shirasuballoons. The first factor, the effect of pressure, was previously reported, and the effect of the infiltrating speed of melt was studied in the present work. When liquid melt infiltrates Shirasuballoon aggregate, pressure slope in the melt is brought about by Shirasuballoons resisting against the melt flow. Thereby compressive stress distribution was shown to be given by σ=Dθ/4μωκ[1-exp(4μωκ/Dl)] for l≤L and σ=Dθ/4μωk[1-exp(-4μωk/DL)]exp[-4μωk/D(1-L)] for l≥L where σ is uniaxial compressive stress acting on Shirasuballoons, D is mold diameter, θ is pressure slope, μw isfrictional coefficient between the mold wall and the Shirasuballoons, k is Rankine's constant, l is the distance from the hot chamber, and L is the length of the melt flow. As shown in the above equations, stress is maximum at the flowing melt front. As Shirasuballoons have their own specific compressive strength, they may fracture by the stress caused by the melt flow, even if the hydrostatic pressure applied is below the critical value for hydrostatic fracture of Shirasuballoons. It was found out in the present work that the maximum uniaxial compressive stress calculated from the above equation exceeded the uniaxial compressive strength of Shirasuballoons and the fracture of Shirasuballoons occurred at a certain velocity of the infiltrating melt.抄録全体を表示PDF形式でダウンロード (1180K) -
竹内 洋一郎, 財満 鎮雄, 谷川 義信, 越智 俊郎1976 年 26 巻 5 号 p. 225-230
発行日: 1976/05/30
公開日: 2008/07/23
ジャーナル フリーA general analysis for the transient thermal stress of a composite cylinder made by bonding is described under the symmetrical temperature condition. Analysis was made by the stress function method with the aid of Laplace transform. Numerical practical problem is illustrated for a composite cylinder of aluminum alloy and steel such as an alclad pipe.抄録全体を表示PDF形式でダウンロード (580K) -
中川 弘昭, 船水 康宏, 正木 航二, 藤野 精一1976 年 26 巻 5 号 p. 231-241
発行日: 1976/05/30
公開日: 2008/07/23
ジャーナル フリーIt has been known that the black spot formation in 6063 alloy extrusion is affected by the cooling process after hot extrusion. However, the influence of precipitation on the black spot formation has not been made clear, because reported experimental results are insufficient to confirm the mechanisms of the black spot formation in surface treatment. In the present research, the black spot formation was studied from the metallographical point of view taking account of the experimental facts on the surface treatment.
The main results were as follows:
1) The black spot formation was attributed to the precipitation of β' Mg2 Si phase irrespective of the size of the precipitates.
2) The precipitation of β' phase was accelerated by the thermal process of rapid cooling and reheating.
3) The black spots were not induced only by slow cooling due to the retardation of the precipitation of β' phase.
4) It was made clear experimentally that the black spot formation in the industrial process would be caused by the thermal process, that is, by rapid cooling and reheating on the carbon plates of the run-out and cooling tables.抄録全体を表示PDF形式でダウンロード (3475K) -
鈴木 寿, 菅野 幹宏, 坂野 茂治1976 年 26 巻 5 号 p. 242-249
発行日: 1976/05/30
公開日: 2008/07/23
ジャーナル フリーThe G. P. zone structure formed in Al-4wt%cu-(00.064)wt%Sn alloys was investigated in relation to aging temperatures(TA, 50 150ªC), aging times (tA, up to 103 minute)and Sn contents by using a highresolution electron microscope. Specimens with 0.4 mm thickness were solution-treated at 520ªC, quenched and subsequently aged.
The results obtained were as follows.
1) The G. P. zones formed in the binary alloy showed a uniform size-distribution in each aging condition; however, those in ternary alloys showed a uniform or nonuniform size-distribution depending on TA, tA and Sn contents.
2) The G. P. zones in ternary alloys became finer than those in the binary alloy as TA lowered, tA shortened or Sn content increased. However, with the progress of aging, the coarse G. P. zones were formed within the structure of fine G. P. zones which showed little growth meanwhile, and their density increased as TA rose and Sn content increased. The coarse G. P. zones grew rapidly at the expense of fine zones, causing an increase of the average dimension and a decrease of the average density compared with those of the binary alloy.
3) Thus, it was found that the zone structure of ternary alloys was essentially different from that of the binary alloy, suggesting that the aging process of ternary alloys was also different. It was also found that the coarse G. P. zones were related to the aging enhancement observed in ternary alloys in the resistance change curves after prolonged aging.抄録全体を表示PDF形式でダウンロード (2266K) -
村山 潔1976 年 26 巻 5 号 p. 250-258
発行日: 1976/05/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (1836K)
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