巻号一覧
57 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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古閑 伸裕, ラッチャニー パイサーン, 石原 直剛, 渡利 久規, 羽賀 俊雄2007 年 57 巻 4 号 p. 141-145
発行日: 2007年
公開日: 2007/05/30
ジャーナル フリーUsing an isothermal rolling machine with a twin roll caster, sheet materials were fabricated with a thickness of t=0.5 mm from three types of magnesium alloy sheets(namely, AZ61, AZ91 and AM60). The result indicates that sheet materials with a limited number of edge cracks can be fabricated from any of these magnesium alloys by rolling at Tr=300°C or higher. Next, the deep drawability of the thus-obtained rolled thin sheets were examined. Regardless of the type of magnesium alloy, the limiting drawing ratios(LDRs)improved the most for the magnesium alloy sheets rolled at Tr=300°C, at which a uniform and very small grain diameter was obtained. Moreover, the LDRs of AZ61, AZ91 and AM60 sheets rolled at Tr=300°C were 2.7, 2.4 and 2.6, respectively. It became apparant that these magnesium alloy sheets have characteristics sufficient for practical use in deep drawing when rolled under appropriate conditions.抄録全体を表示PDF形式でダウンロード (1572K) -
松本 尚之, 橋本 和明, 高谷 松文, 戸田 善朝, 政 誠一2007 年 57 巻 4 号 p. 146-151
発行日: 2007年
公開日: 2007/05/30
ジャーナル フリーAluminum anodic oxide film with a two-layer structure was successfully prepared by a two-step anodic oxidation process in two solutions of phosphoric acid (H3PO4) and sulfuric acid (H2SO4). The two-layer structure consists of the upper layer with wide pores and the lower layer with narrow pores. Subsequently, titanium dioxide (TiO2) was electrodeposited into wide pores in upper layer. The TiO2 content in the obtained sample depended on the concentration of TiO2 sol, pH and the migration voltage during electrodeposition. The hardness, corrosion resistance and sealing degree of the sample with TiO2 were almost the same as that of the sealed sample without TiO2. On the other hand, the electron spin resonance (ESR) measurement indicated that hydroxyl radicals (·OH) were generated from the prepared sample by the irradiation of ultraviolet light. Furthermore, antimicrobial activity to Escherichia coli of the anodic oxide film of aluminum electrodeposited TiO2 was higher than that without TiO2. These results suggested that the two-layered anodic oxide film of aluminum electrodeposited with TiO2 would be a novel photocatalytic antimicrobial material.抄録全体を表示PDF形式でダウンロード (849K) -
山崎 隆夫, 土屋 和博, 佐藤 運海2007 年 57 巻 4 号 p. 152-156
発行日: 2007年
公開日: 2007/05/30
ジャーナル フリーThe ultrasonic vibration cutting is a processing method by small serration collision of tool and work piece. 50 years passed, after this working method was advocated. Recently, this working method is not always clear on hoop again notice begin to and the cutting mechanism. This study described ultrasonic vibration cutting of titanium base alloy (TAB6400). The turning by vibration cutting and conventional cutting was carried out in order to clarify the cutting mechanism of the ultrasonic vibration cutting. The following were observed: cutting force, tool wear, surface roughness, tools edge temperature and chip shapes. As a result, the vibration cutting was found to lower cutting force, and the tool wear was proved to be suppressed. However, the remarkable effect on the surface roughness could not be observed. They were also flowing and good cutting on the chip form. Ruggedness was observed in edge side of which the chip shape seemed to be features of the vibration cutting. From above ultrasonic vibration cutting of the titanium base alloy under limited condition, clarified the effectiveness though.抄録全体を表示PDF形式でダウンロード (1466K) -
岩崎 祐紀, 片山 義博, 小松 伸也, 天野 裕之2007 年 57 巻 4 号 p. 157-162
発行日: 2007年
公開日: 2007/05/30
ジャーナル フリーTrace nickel addition improved a property of aluminum bonding wire. Recently some investigators reported equilibrium solid solubility of Ni to Al smaller than previous values. Therefore, its re-investigation is necessary. Wire and sheet of Al–Ni dilute alloys were prepared with total impurity contents less than 15 ppm. After heat treatments at temperatures above 523 K, electrical resistivity was measured at 77 K and 300 K by four contacts DC potentiometry and density-mass method size factor. Resistivity at 77 K, ρD77, after solution treatments showed a good linear relation to Ni contents up to 310 ppm. The 438 ppmNi specimen of the highest content showed a smaller ρD77 than the straight line, suggesting incomplete dissolution of Ni. Contribution per unit concentration of Ni to the ρD77, Δρ77Ni, was 10.4±0.2 nΩm/mass%. Resistivity values at 300 K, ρD300, were at maximum only 1.7% higher than that of ideally pure aluminum. Though linearity of the line was poor, Δρ300Ni was 8.86±1.09 nΩm/mass% and still higher than the Fink et al.'s value. The equilibrium solubility of Ni determined at temperatures ranging 723 K to 913 K is expressed as CeqNi/mass% = 1.36×104 exp(−1.16×104/T), giving maximum solubility about 20% lower than Fink et al.'s.抄録全体を表示PDF形式でダウンロード (518K)
解説
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活字鋳造から自動車足回り部品まで西 直美2007 年 57 巻 4 号 p. 163-170
発行日: 2007年
公開日: 2007/07/30
ジャーナル フリーPDF形式でダウンロード (2334K)
連載講座
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桑原 利彦2007 年 57 巻 4 号 p. 171-181
発行日: 2007/04/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (1258K)
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