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60 巻, 10 号
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研究論文
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西田 進一, 本村 貢原稿種別: 研究論文
2010 年 60 巻 10 号 p. 477-481
発行日: 2010/10/30
公開日: 2010/11/30
ジャーナル フリーThe aim of this study is to clarify formability by conical cup test at room temperature of AZ31 magnesium alloy strip produced by the melt drag process. The strip produced by melt drag process was solution heat treated at 400°C, then was rolled with 5% reduction. We investigated the microstructure, crystal orientation, mechanical properties and formability of the strip using conical cup test at room temperature. Strip produced by melt drag process was compared with commercial rolled sheet. Average crystal grain size of melt drag strip was 39 μm and the crystal orientation was randomized. While melt drag strip had lower proof strength, larger n value and better formability than those one's of commercial sheet.抄録全体を表示PDF形式でダウンロード (3543K) -
西田 進一, 本村 貢原稿種別: 研究論文
2010 年 60 巻 10 号 p. 482-485
発行日: 2010/10/30
公開日: 2010/11/30
ジャーナル フリーMagnesium alloy is the lightest structural material, so the market is increasing. The purpose of this study is to reveal the effect of protective gases and Ca addition for magnesium alloy strip in melt drag process. Molten magnesium is active, so protective gas is need to prevent oxidization or burning. Protective gas is filled into experimental device. Protective gases in this paper are below; SF6+CO2, SF6+Ar, CO2, Ar, HFC-134a and HFC-134a+Ar. Through of the view point of to prevent oxidization, 2 mass% Ca added into molten magnesium. For comparison, we produced strip in air. We revealed these protective gases affected strip surface conditions, strip thickness and crystal grain size. Ar gas made strip surface flat.抄録全体を表示PDF形式でダウンロード (2792K) -
遠藤 至, 千葉 浩行, 植木 徹, 鳥山 隆成, 吉田 誠原稿種別: 研究論文
2010 年 60 巻 10 号 p. 486-491
発行日: 2010/10/30
公開日: 2010/11/30
ジャーナル フリーDetection of AE signals of solidification cracking of Al–7mass%Si alloy was attempted with in situ microscopic observation on the surface of casting using high speed camera. During solidification, it was found that AE signal from the casting with crack was higher than AE signal from the casting without crack. As a result of observation of casting using high speed camera, it was found that a rise of AE signal corresponded to initiation of solidification cracking. This stage was the stage of eutectic solidification. Thus, AE signals of solidification cracking should be generated during eutectic solidification. However, AE signals from the casting without cracking were also detected during solidification. This means that AE signals other than solidification cracking should be generated during solidification. Therefore, AE signals detected during eutectic solidification is not necessarily AE signals of solidification cracking. In order to detect AE signals of solidification cracking, it is necessary to separate AE signals of solidification cracking and other than solidification cracking.抄録全体を表示PDF形式でダウンロード (3681K) -
遠藤 至, 千葉 浩行, 植木 徹, 鳥山 隆成, 吉田 誠原稿種別: 研究論文
2010 年 60 巻 10 号 p. 492-498
発行日: 2010/10/30
公開日: 2010/11/30
ジャーナル フリーDetection of solidification cracking of Al–7 mass%Si alloy was attempted by using acoustic emission method. According to our previous report, it was found that it is necessary to separate AE of solidification cracking from other estimated sources such as gas porosity, shrinkage cavity, or eutectic solidification to detect AE of solidification cracking. Then, we investigated about AE signals of gas porosity, shrinkage cavity, and eutectic solidification. As a result, AE of eutectic solidification was not generated or was too small to detect. AE of shrinkage cavity and gas porosity formation were detected at the start of eutectic solidification, and the frequency band was 150 kHz or less. The frequency band of AE accompanied with fracture of solidifying castings was also 150 kHz or less. Therefore, it was difficult to separate AE of solidification cracking from gas porosity, shrinkage cavity, or eutectic solidification by the frequency band. However, integrated AE peak volt during solidification correlated with crack ratio. When Solidification cracking occurred, Integrated AE peak volt was about more than 1000 V during solidification. In situ detection of solidification cracking will be possible by investigating integrated AE peak volt.抄録全体を表示PDF形式でダウンロード (2823K) -
大﨑 修平, 前田 悦宏, 木下 勝之, 藪田 均原稿種別: 研究論文
2010 年 60 巻 10 号 p. 499-504
発行日: 2010/10/30
公開日: 2010/11/30
ジャーナル フリーThe resistance to fatigue crack growth in a high-humidity (relative humidity RH90%–25°C) air was evaluated for 7000 series aluminum alloys with a higher strength above that of 6061-T6. The alloys, 7N01 and 7003 with temper in T6, T5 or T7, respectively, showed a medium resistance between those of 7075-T6 and 6061-T6. The fatigue crack growth rate da/dN in the humid air increased compared with that in dry nitrogen gas, where 7075-T6 exhibited the highest values of da/dN and the rate-ratio of 2 at ΔK=12 [MPa√m]. Despite the enhanced crack growth due to the reduction in fracture surface roughness in the humid air, the decrease in frequency from 10 Hz to 0.1 Hz gave rise to a decrease in da/dN for 7075-T6, which is attributed to the microscopic crack deflection induced by rough zigzag facets formed on a transgranular crack surface. It is presumed that these rough facets result from the concentrated or localized slip at crack tip enhanced by hydrogen effects.抄録全体を表示PDF形式でダウンロード (4805K) -
山川 治, 白川 浩, 櫻田 修, 橋場 稔原稿種別: 研究論文
2010 年 60 巻 10 号 p. 505-510
発行日: 2010/10/30
公開日: 2010/11/30
ジャーナル フリーThe quality of molten aluminum is dependent on the methods used for its treatment to remove impurities. Of these, rigid media tube filter (RMF) has been the most reliable. RMF bound coarse grain of alumina by 9Al2O3·2B2O3 has been used widely all over the world. The purpose of this study was to examine the filtration efficiency of RMF using an aqueous suspension of ceramic powder instead of molten aluminum. During actual operation, inclusions accumulate on the surface of RMF to form a cake layer. But the cake formation was not expected in aqueous suspension, since its filtration efficiency showed initial operational conditions, i.e. surface and internal filtration. The results of our experiment clearly showed that filtration efficiency of RMF depended upon pore size and the operation condition. Namely, the filtration efficiency of small pore RMF allowed as high as possible removal of fine inclusions. It was confirmed that maximum inclusion size that could possible be filtered, was approximately 10% of maximum RMF pore size. Also, the operation conditions for higher filtration efficiency, was a slower flow rate and an aqueous suspension of low inclusion concentration. The filtration performance for double layers RMF was influenced by a smaller pore size and the filtration resistance reduced as compared to single layer. As the result of aqueous suspension was similar to that of TiB2 added molten aluminum, it was assumed that the aqueous suspension examination method was reliable.抄録全体を表示PDF形式でダウンロード (604K)
解説：第13回軽金属学会賞
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小松 伸也原稿種別: 解説：第13回軽金属学会賞
2010 年 60 巻 10 号 p. 511-529
発行日: 2010/10/30
公開日: 2011/01/30
ジャーナル フリーPDF形式でダウンロード (7648K)
連載講座
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高倉 優2010 年 60 巻 10 号 p. 530-538
発行日: 2010/10/30
公開日: 2023/01/30
ジャーナル フリーPDF形式でダウンロード (1677K)
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