巻号一覧
53 巻, 9 号
選択された号の論文の7件中1～7を表示しています
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研究論文
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高谷 泰之, 山本 雄一郎, 山本 厚之, 椿野 晴繁2003 年 53 巻 9 号 p. 361-367
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーSurface segregation phenomena of iron in high purity aluminum alloys containing 280mass-ppm iron (Al–280Fe) were investigated by using electrochemical impedance technique. The specimens were heat-treated at 723 K for 20 h. Surface oxide films were dissolved into solution at pH 8.0 and then electrochemical impedance was measured in H3BO4–Na2B4O7 solution. All specimens have the surface oxide film and the reciprocal capacitance (1/Cf) of the films has decreased with chemical dissolution. The decreasing rate of 1/Cf for the annealed Al–280Fe is remarkably slower than that in high purity aluminum containing free iron (5N–Al) and has shown two characteristic regions: one region which deflect the concentrated iron, 1/Cf decreases gradually as the dissolution time increases and the resistance of the film in Al–280Fe is smaller than that in the film on 5N–Al, the other region, the decreasing rate of 1/Cf and resistance in Al–280Fe are similar to those in 5N–Al.抄録全体を表示PDF形式でダウンロード (510K) -
藤井 靖充, 戸田 裕之, 小林 俊郎2003 年 53 巻 9 号 p. 368-372
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーCutting chip is, generally, separated from cutting oil and then remelted for recycling solely as raw materials. In terms of microstructures, however, the cutting chip may be identified utilizable due to highly-accumulated strain during its formation. In this study, aluminum chips are consolidated by cold severe plastic deformation so that their highly deformed microstructure is utilized for the strengthening of an aluminum alloy. After a preliminary investigation in which a variety of cutting processes and conditions are examined to find the optimum one for the present purpose, the aluminum chips have been successfully consolidated by a combination of pressing and swaging. The consolidated chips exhibit superior strength together with finer microstructure to a wrought alloy when compared at a same applied strain. In addition, a couple of methods are demonstrated effective to eliminate the undesirable effects of oxide film on the surface of the chips, which inevitably causes debonding during loading.抄録全体を表示PDF形式でダウンロード (679K) -
浅沼 博, 箱田 元司, 栗原 春樹, 魯 云2003 年 53 巻 9 号 p. 373-377
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーThis paper describes a proposal of an active SiC fiber/aluminum composite utilizing its thermal deformation caused by non-uniform distribution of reinforcement fibers. In this study, a laminate of continuous and unidirectional SiC fiber reinforced aluminum plate and unreinforced aluminum plate was fabricated by the interphase forming/bonding method using copper insert foil and its thermal deformation characteristics were investigated. The fabricated composite was unidirectionally and distinctively curved in the fiber direction by cooling from its hot pressing temperature, of which deformation is advantageously different from that of bimetal. Curvature of the composite at room temperature was almost maximized by experimentally investigating the effect of thickness of the aluminum plate, distance between the fibers and length of the composite. Under the optimum condition, its dependence on fiber length was clarified and it was found that the curvature is locally changeable by changing the fiber length. It was also clarified that copper concentrated around the fibers, which was introduced by the interphase forming/bonding method, contributes to increase the curvature of the composite. In the case of actuation test, the curvature of the composite at room temperature was reduced by heating and became zero at the temperature of about 580 K. This temperature and the curvature at room temperature were reproducible and were kept at the same levels even after ten thermal cycles. These results suggest an availability of this composite as an active material.抄録全体を表示PDF形式でダウンロード (448K) -
畑中 伸夫, 山口 克彦, 高倉 章雄, 飯塚 高志2003 年 53 巻 9 号 p. 378-384
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーIn order to improve sheared edge quality of aluminum sheets, shearing tests were conducted under various axial stresses at the shearing region, and the effect of the axial stress was investigated. Numerical simulations of the shearing process were carried out using a rigid plastic finite element simulation code developed by the authors. In the simulation, the Jeong expression was used as a fracture criterion of aluminum sheet. The distributions of fracture value and mean normal stress at the shearing region of the sheet were calculated. The experimental and simulation results showed that the rollover depth and fracture surface length decrease, but the burnish surface length increases with increasing additional axial compressive stress. When the axial compressive stress was applied, the mean normal stress becomes lower at the shearing region. Therefore, the fracture value was decreased, and the crack initiation was delayed. The experimental results were in good agreement with the simulation results.抄録全体を表示PDF形式でダウンロード (591K) -
篠田 剛, 河田 真一, 竹上 弘彰2003 年 53 巻 9 号 p. 385-389
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーFriction welding of dissimilar metals was performed to evaluate the formation of intermetallic compound during welding. In our research, A6061 aluminum alloy and S45C carbon steel were applied to investigate effect of friction welding parameters on the strength of welded joint. A continuous drive vertical friction welding machine was employed. Tensile test results revealed that the maximum tensile strength was achieved at extremely short friction time and high upset pressure, that was friction time 1 s and upset pressure about 250 MPa. The joint strength reached 92% of the tensile strength of A6061 base metal. Tensile strength of friction welding was increasing with increasing upset pressure under friction time 1 s. However, tensile properties were deteriorated with increasing friction time. Prolonged friction time to 3 s was given less joint strength 52% than that of 1 s. It was observed that the amount of intermetallic compound was increasing with increasing friction time at weld interface. Partly formed intermetallic compound on weld interface were recognized at friction time 1 s. However, intermetallic compound layer were severely developed with longer friction time at weld interface. Consequently it was concluded intermetallic compound layer deteriorated the tensile properties of weld joints.抄録全体を表示PDF形式でダウンロード (533K)
解説：初歩の特許講座
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家森 新一, 永吉 康典2003 年 53 巻 9 号 p. 390-392
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーPDF形式でダウンロード (291K)
連載講座
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菊池 雅史2003 年 53 巻 9 号 p. 393-399
発行日: 2003/09/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (1433K)
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