巻号一覧
36 巻, 7 号
選択された号の論文の10件中1～10を表示しています
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木村 啓造1986 年 36 巻 7 号 p. 393-394
発行日: 1986/07/31
公開日: 2008/07/23
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塩川 誠, 戸嶋 茂郎, 佐藤 栄一1986 年 36 巻 7 号 p. 395-401
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーStress corrosion behavior of the aged 2017 alloy was electrochemically measured in 1/3M AlCl3 and 1M NaCl solution, corrosion potential is shifted by stress to being considerably noble, which may be attributed to the decrease of anode limiting current density. On the other hand, pitting potential is shifted a little to being less noble. These shifts decrease the potential difference between corrosion and pitting potentials, that is, stress increases the local corrosion susceptibility. Electrochemically the maximum susceptibility of stress corrosion is found in the aged specimen held for 10h, at 180°C. This almost agrees with the evaluation of stress corrosion cracking susceptibility obtained by the constaut strain corrosion test.抄録全体を表示PDF形式でダウンロード (2071K) -
大滝 光弘, 小林 敬一, 本間 梅夫, 雄谷 重夫1986 年 36 巻 7 号 p. 402-408
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリー著者らの考案した引張試験装置を用い, 共晶の晶出を伴い, しかも結晶粒径の異なるAl-2~20%Cu合金およびAl-2~7%Si合金の凝固過程での引張強さおよび最終凝固部の局部伸びとして表される変形能を測定した。
(1) 変形能は凝固しつつある合金でのマイクロクラックの発生および伝播の尺度として考えることができる。
(2) 合金は, 晶出相の成長過程およびそれに伴う残留液相の挙動に応じて, 試験片の形状を変えて変形できる状態 (ステージI), 変形能が急激に減少する状態 (ステージII), 明らかな強度増加が認められるが変形能が非常に小さく脆弱な状態 (ステージIII) および引張強さと変形能が急激に増加する状態 (ステージIV) を経て凝固を終了する。
(3) 共晶を晶出するAl-2~20%Cu合金およびAl-2~7%Si合金では溶質量が増すにつれて, 引張強さの発生が遅れ, そして変形能が大きくなる。また結晶粒の微細化は変形能を大きくする。
(4) 変形能の大きさはデンドライト界面におけるマイクロクラックの発生および伝播の程度に支配され, 凝固組織形態 (固相率, 晶出相の大きさ, 形状や種類等) に依存する。抄録全体を表示PDF形式でダウンロード (1740K) -
高辻 雄三, 山田 茂, 水谷 秀行, 佃 市三1986 年 36 巻 7 号 p. 409-415
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーDry cutting tests of 5056 alloys which were added Fe (0.014-0.19wt%) and Si (0.006-0.07wt%) were made using high speed steel (SKH4) and sintered carbide tool (K10). Effect of these elements on the machinability was studied from the viewpoints of cutting resistance, built up edge, cut surface roughness, tool wear and chip disposal.
(1) Under a low cutting speed, machined surface of all specimens were rough and scaly for forming of built up edge. However, under a high cutting speed, feed marks on machined surface appeared clearly and its roughness value was low. Especially the finished surface of alloy which contains less Fe and Si approximated to the theoretical value.
(2) Following the increase of Si content which formed metallic compound Mg2Si in this alloy, the tool wear rates on flank and rake face were rapid. In increasing Fe content which formed metallic compound Al-Fe, the rake face wear progressed rapidly. But, it was less affected with the flank wear rates.抄録全体を表示PDF形式でダウンロード (1287K) -
興戸 正純, 沖 猛雄1986 年 36 巻 7 号 p. 416-420
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーThe direct current change and impedance response in a frequency range of 10mHz-10kHz were measured on aluminum electrode under pitting corrosion in 1kmol/m3 Na2SO4 solution containing 0.68kmol/m3 NaCl at the potential of-0.36V (NHE). The tendency of the pitting current density to increase changes at the value of about 100A/m2. A capacitive semicircle into appears on the impedance complex plane at the current density of 4.09A/m2 under pitting corrosion. It changes two semicircles at 71A/m2. Three semicircles are obtained at the current density above 100A/m2. The diameter of semicircle R1 which corresponded to the resistance of charge transfer reaction is related to the current density I,
I=K/R1 K=2.5×10-3 (V)
The pitting mechanism of aluminum is explained by the dissolution of aluminum through the aluminum salt film, the hydrolysis of this salt film and hydrogen evolution reactions from impedance analysis.抄録全体を表示PDF形式でダウンロード (578K) -
小島 陽, 古川 智行, 小林 勝, 中村 正久1986 年 36 巻 7 号 p. 421-428
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーThe grain refining of two kinds of high strength aluminum alloys, 7075 and 7475 alloys, was carried out by means of thermomechanical processing, and their superplasticity was evaluated. A mean grain size of about 22μm is obtained in rolling of low reduction per pass at 200°C in 7075 alloy. When the alloys are deformed at 520°C, the m value greater than 0.5 and the flow stress smaller than 1kgf/mm2 are obtained in a wide range of strain rate. Total elongation of 800% is obtained in 7075L200 sheets having high m value. The grain size is constant during superplastic deformation, but grain coarsening occur slightly after 380% of deformation. The grain boundary sliding (striation) is observed at 100% of deformation. The mechanism of superplastic behavior is mainly depending upon the grain boundary sliding and the dynamic recrystallization in almost all strain range. Grain coarsening occurs at large strain just before fracture in accompanying the formation, growth and linking of cavities.抄録全体を表示PDF形式でダウンロード (2300K) -
池野 進, 福持 泰明, 上谷 保裕, 多々 静夫1986 年 36 巻 7 号 p. 429-435
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーThe Effect of Mn on ductility of Al-1%Mg2Si-0.4%Si alloy was investigated by tensile test and optical and transmission electron microscopies observation. When the peak aged alloy is free from Mn bearing dispersoids, elongation increases up to about 9% with decrease of grain size. If the aging temperature is constant, the width of precipitale free zones was almost independent of grain size in 0.2%Mn addition alloys. While the spacing of slip bands of specimen surface extends with increase of grain size. These dependence of slip band spacing on grain is more distinct, when the intergranular fracture is a dominant factor governing the fracture.抄録全体を表示PDF形式でダウンロード (1817K) -
張 荻, 佐治 重興, 堀 茂徳1986 年 36 巻 7 号 p. 436-444
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーPrecipitation during aging, fatigue behavior of aged specimens and effects of grain size on fatigue strength in the peak aged condition of Al-1.8%Li alloy were investigated. Precipitation of the metastable δ'-phase occurs during quenching from the solution treating temperature. The average diameter of particles is about 360Å in the peak-aged specimen. The width of precipitate free zones decrease during aging and the formation of PFZ in this aging process are explainable by a mechanism of the depletion of vacancies in the region along grain boundary. Fatigue strength increases with age-hardening. Fatigue cracks nucleate preferentially at the sharp or coarse slip bands in aged specimens and propergate mainly along them. PFZ is not main cause for the fatigue failure under the lowers tress. Fatigue strength of the peak-aged specimen increases with decreasing grain size.抄録全体を表示PDF形式でダウンロード (4271K) -
中川 知和, 武林 慶樹1986 年 36 巻 7 号 p. 445-452
発行日: 1986/07/31
公開日: 2008/07/23
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諸住 正太郎1986 年 36 巻 7 号 p. 453-459
発行日: 1986/07/31
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (1107K)
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