巻号一覧
59 巻, 8 号
選択された号の論文の9件中1～9を表示しています
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研究論文
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森下 誠, 阿部 光宏, 徳田 健二, 吉田 誠原稿種別: 研究論文
2009 年 59 巻 8 号 p. 417-423
発行日: 2009/08/30
公開日: 2009/10/01
ジャーナル フリーSince it has been difficult to predict a crack sensitivity depending on alloy composition during aluminum DC casting, a new prediction method based on a relation between calculated solid fraction and temperature was developed concerning Al–Mn and Al–Mg series aluminum alloys. In order to understand that the surface crack is located at ingot surface, two cracking modes were considered. They were due to “difference in strain between water chilling surface and mushy surface (crack mode Z)” and “difference in strain rate between surface and just inner surface (crack mode Y)”. It's common knowledge that the material is cracked at high solid fraction region since melt cannot go into a crack gap and ductility is very low. Therefore we assumed the high solid fraction region was from 0.75 to 0.95 (Region II) and set up two indexes which are calculated from temperature difference (ΔTII) and difference in a temperature drop per unit solid fraction (ΔRII/ΔTII) within the Region II. By using the both indexes, which were called “Brittle temperature range” and “Parameter of the strain rate difference” respectively, the crack sensitivities through DC casting experiments were suitably represented.抄録全体を表示PDF形式でダウンロード (1787K) -
世利 修美, 丹野 聡司原稿種別: 研究論文
2009 年 59 巻 8 号 p. 424-426
発行日: 2009/08/30
公開日: 2009/10/01
ジャーナル フリーAluminum ethyleneglycoxides, Al (OCH2CH2OH) 3 were obtained when aluminum powder mixed with AlCl3 has been refluxed in dehydrated ethylene glycol at 471 K for 12 h. Characteristics of the aluminum ethyleneglycoxide were measured by XRD and particle size distribution analysis. Particle morphology observed by SEM was like rectangular column shape. It is considered that the aluminum ethyleneglycoxides obtained is interpreted as corrosion product which is a reaction product that aluminum was corroded in ethyleneglycol.抄録全体を表示PDF形式でダウンロード (1587K) -
小澤 武廣, 斎藤 正次原稿種別: 研究論文
2009 年 59 巻 8 号 p. 427-431
発行日: 2009/08/30
公開日: 2009/10/01
ジャーナル フリーEffect of content and melting point of polyethylene wax in coating film on stain resistance and formability of pre-coated aluminum sheet was investigated. In order to estimate stain resistance, stain resistance test using red ink was performed. To estimate formability, the drawing test was performed and the limiting drawing ratio (LDR) was measured. Stain resistance was good when the content of polyethylene wax in coating film was 3% or less, but it was slightly poor when it was 5%. It was confirmed that red ink stains were osmosed in the polyethylene wax particle observed in the surface of coating film. It was considered that stain resistance was influenced by the condition of the particle. Stain resistance was good when the melting point of polyethylene wax was 343 K, 373 K, 393 K, and 403 K. Formability was better, as the content of polyethylene wax increased. Formabilty was inferior, as the melting point of polyethylene wax was higher than 393 K.抄録全体を表示PDF形式でダウンロード (3367K) -
高橋 知司, 小澤 卓矢, 南埜 宜俊, 小松 正雄原稿種別: 研究論文
2009 年 59 巻 8 号 p. 432-438
発行日: 2009/08/30
公開日: 2009/10/01
ジャーナル フリーThe interdiffusion in Ti-rich β Ti–Al–Co alloys has been investigated in the temperature range from 1323 to 1473 K. The main interdiffusion coefficients, DAlAlTi and DCoCoTi, and cross interdiffusion coefficients, DAlCoTi and DCoAlTi, have positive values in the ternary alloys, and these four interdiffusion coefficients have slight concentration dependence. The values of DCoCoTi are larger than those of DAlAlTi, and the values of DCoAlTi are also larger than those of DAlCoTi. The repulsive interactions exist between Al and Co atoms in the Ti–Al–Co alloys, because the ratio values of cross coefficient to main one are positive in sign. On the other hand, the interactions between Ti (solvent) and Al (or Co) atoms are attractive in the present alloy, since the ratio of converted interdiffusion coefficients in the ternary alloys shows negative values.抄録全体を表示PDF形式でダウンロード (592K) -
八太 秀周, 松田 眞一, 田中 宏樹, 吉田 英雄原稿種別: 研究論文
2009 年 59 巻 8 号 p. 439-443
発行日: 2009/08/30
公開日: 2009/10/01
ジャーナル フリーThe effects of natural aging at 20°C and pre-aging at 100°C on the bake hardenability of Cu added Al–Mg–Si alloys have been studied by tension testing, hardness measurements, electrical resistance measurements and a differential scanning calorimetric analysis (DSC). The bake hardenability of the base alloy (0%Cu) was enhanced by the Cu addition. Moreover, the decline in the bake hardenability during natural aging slowly decreased with the Cu content. Because the increase in the forming cluster (1) was restrained by the Cu addition during the brief natural aging, the β″ phase then immediately precipitated during baking at 170°C for 1.2 ks. Pre-aging at 100°C after quenching significantly affected the bake hardenability of the Cu added alloys. The increase in the forming cluster (1) was also restrained by pre-aging during the natural aging. Therefore, the pre-aged Cu added alloys have a superior bake hardenability compared to the 0%Cu alloy after natural aging.抄録全体を表示PDF形式でダウンロード (606K) -
糸井 貴臣, 鈴木 武, 河村 能人, 広橋 光治原稿種別: 研究論文
2009 年 59 巻 8 号 p. 444-449
発行日: 2009/08/30
公開日: 2009/10/01
ジャーナル フリーTernary Mg–Zn–Y alloy sheets with several volume fractions of a Mg12ZnY phase were prepared by hot-rolling at 623 K. Volume fraction of the Mg12ZnY phase was increased with increasing of Zn and Y contents in the Mg100–x–yZnxYy (x=1~6, y=2~9 at%) alloys, and achieved more than 85% in an Mg85Zn6Y9 alloy. (002) pole figures showed both of basal planes of the Mg12ZnY- and Mg phases have a tendency to orient the plane of the sheet by hot-rolling. However, it was considered that the formation of a basal texture of the Mg12ZnY phase is difficult compared with the Mg phase, due to introduce a kink deformation. An Mg90.5Zn3.25Y6.25 alloy sheet exhibited a 0.2% proof strength, an ultimate tensile strength, and an elongation of 353 MPa, 400 MPa, and 5%, respectively, at room temperature, and 279 MPa, 375 MPa, and 12%, respectively, at 523 K. Although elongation was slightly limited compared with commercial magnesium sheets, the Mg90.5Zn3.25Y6.25 alloy sheet exhibited high strength over a wide temperature range compared to commercial magnesium alloys.抄録全体を表示PDF形式でダウンロード (2234K)
解説：軽金属学会賞
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吉永 日出男原稿種別: 解説：軽金属学会賞
2009 年 59 巻 8 号 p. 450-457
発行日: 2009/08/30
公開日: 2009/11/30
ジャーナル フリーPDF形式でダウンロード (7021K)
解説
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北薗 幸一原稿種別: 解説
2009 年 59 巻 8 号 p. 458-463
発行日: 2009/08/30
公開日: 2009/11/30
ジャーナル フリーPDF形式でダウンロード (553K)
連載講座
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榊原 勝弥2009 年 59 巻 8 号 p. 464-475
発行日: 2009/08/30
公開日: 2021/06/15
ジャーナル フリーPDF形式でダウンロード (2069K)
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