巻号一覧
43 巻, 7 号
選択された号の論文の8件中1～8を表示しています
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吉村 長蔵, 藤野 隆由, 白石 哲也1993 年 43 巻 7 号 p. 353-358
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーIn the case of Air-C2H2 flame, the maximum amounts of aluminum which can coexist is 100 times of magnesium by addition of 0.005mass% carbon black (CB) and a liner relation highly dependent on magnesium content is obtained. But in the case of calsium, there are minimum and maximum in the absorption curves and the interference of coexisting aluminum can not be eliminated by CB. In the cases of strontium and barium, the interference of coexisting aluminum can not be eliminated by CB, either. The removal action by CB addition corresponds to the enhancing effect by CB. On the other hand, in the case of N2O-C2H2 flame, addition of CB can remove the influence of aluminum on calcium absorption and high sensitive absorption curve is obtained. A practical application of the present investigation to analysis of magnesium content in an Al-Mg alloy was done with a satisfactory result.抄録全体を表示PDF形式でダウンロード (591K) -
小松 伸也, 池田 勝彦, 生駒 俊彦, 河野 洋一, 新谷 智彦, 内田 博幸1993 年 43 巻 7 号 p. 359-364
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーStarting from the as cast state, changes in absolute resistivity during solutionizing and aging treatments were investigated. Precipitation and dissolution of β phase with isochronal treatment and dissolution process of grain boundary β phase (G. B. β) with the isothermal solution treatment were clearly detected by the resistivity change. These were also confirmed by changes in hardness and optical microstructures. Even in the as cast state, precipitates of the G. B. β and nodules, lamellar products of grain boundary reaction, had already existed. At 673K, the nodule easily dissolved within 3.6ks, but the G. B. β required 360ks to dissolve. Age-hardening at 473K of the specimen with the completely dissolved G. B. β was superior to that of the partially dissolved specimen. The resistivity saturated by the 473K aging was slightly higher than the estimated value from the equilibrium solubility of Al, determined by extrapolating the solubility on an Arrhenius plot. This was explained by the fact that the large amount of precipitates affected the measured resistivity.抄録全体を表示PDF形式でダウンロード (1401K) -
越智 秀, 小川 恒一, 加賀 精一, 大池 尚, 菅 泰雄1993 年 43 巻 7 号 p. 365-371
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーThe optimum welding condition for brake type friction welding of titanium and SUS304 stainless steel was investigated using a response surface method. The optimum friction pressure, forging pressure, friction time and rotating speed of welding were determined as 91MPa, 195MPa, 0.8s and 1842rpm, respectively. The joint welded in CO2 gas had higher tensile strength than that welded in air. The transformation of α-Ti into β-Ti and γ-Fe(Cr) into α-Fe(Cr), and the formation of intermetallic compound (Fe(Ni)•Ti) were induced by the interdiffusion along the welding interface. The joint strength depends on the width of β-Ti and Fe(Ni)•Ti layer.抄録全体を表示PDF形式でダウンロード (1183K) -
広前 義孝, 小林 敏明, 斉藤 正次, 水野 薫, 前田 滋, 本田 和彦1993 年 43 巻 7 号 p. 372-377
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーThe structure of the oxide film and the enrichment of copper on the surface of an Al-4.5%Mg-0.3%Cu alloy pickled in sulfuric and nitric acid were investigated using GDS, XPS and SIMS techniques. The outside MgO layer of 10nm in thickness composed of high MgO and Al2O3 On the alloy surface after solution annealing was removed within a few seconds in the pickling solution. Then, the Al-4.5%Mg-0.3%Cu alloy slowly dissolved in the solution with the activation energy of 46±3KJ•mol-1. copper in the alloy became concentrated on the surface in proportion to the weight loss of the Al-4.5%Mg-0.3%Cu alloy in pickling.抄録全体を表示PDF形式でダウンロード (737K) -
小松 伸也, 池田 勝彦, 生駒 俊彦, 東野 鋼三, 安倍 睦1993 年 43 巻 7 号 p. 378-384
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーResistivity changes during heat treatment and effects of solution treatment on aging behavior were investigated for an extruded ZK60 magnesium alloy containing 4.8%Zn, 0.52%Zr and Mn, Si and Pb less than 0.04% as impurities. Change in resistance ratio R(=ρ300/ρ77) with isochronal aging well corresponded with age-hardening. The increase in the solution treatment temperature resulted in the decreased R and increased resistivity ρ due to increased solute Zr concentration. The higher solution temperatures resulted in the increased maximum hardness and decreased incubation period aging. Particles containing Zn and Zr were observed remaining even after solution treatment at 773K for 36ks. Activation energy for the nucleation of precipitates below 473K was determined to be 70.5 to 76.3kJ/mol based on the incubation period for change in R. Empirical relation between R and ρD77. for the present alloy was obtained as follows: 11<ρD77/nΩm=43.3/(R-1)-0.584<23. Comparing the numerator of this equation with previously reported ρ values for the purest magnesium, the contribution of dissolved Zn in Mg to ρ was expected to increase with increasing temperature for the ρ measurement.抄録全体を表示PDF形式でダウンロード (864K) -
市村 稔, 篠嶋 妥1993 年 43 巻 7 号 p. 385-391
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーHydrogen diffusivity in Al-(2-14mass%) Si alloy ingots melted in nitrogen gas flow and solidified unidirectionally were measured by a vacuum hot extraction method. The diffusivity of D1 for as-cast samples decreased to D2 for hydrogen-charged and extracted samples, under an influence of the heating effects. The differences between D1 and D2 increased at the lower temperatures and with amounts of eutectics. The heating effects attended with the decreasing of diffusivity were due to two phenomena. The first was a loss of a long-range enhanced diffusion paths along the surfaces on the thin plate-like particles of eutectic silicon in as-cast samples, and the second was a grow-up of hydrogen trapping at the large granular silicon particles precipitated in α-aluminum at around 673K. The hydrogen solubilities in Al-Si alloys increased with the concentration of silicon.抄録全体を表示PDF形式でダウンロード (2310K) -
大石 敏雄, 岡部 徹, 小野 勝敏1993 年 43 巻 7 号 p. 392-400
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (951K) -
藤谷 渉1993 年 43 巻 7 号 p. 401-402
発行日: 1993/07/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (246K)
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