巻号一覧
42 巻, 10 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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後藤 博己, 坂田 和幸, 当摩 建1992 年 42 巻 10 号 p. 549-554
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーThe surface analyses and the anodic polarization measurements on Al-0.01%Sn alloys heated at 823K for 6h have been carried out to investigate the relations between the electrochemical properties and the morphology of Sn at the surface layer. After the heating the fine Sn particles were uniformly distributed at the metal-oxide film interface. The rapid current increase was observed at two different potentials in the polarization curves on the alloys. They are attributed to the formation of two different potential layer due to the segregation of Sn at the surface, that is, the potential of surface layer is less noble that of inner one because of more amount of solid solution Sn in the former. On the other hand, the densely distributed finer shallow pits occured in the anodic dissolution at lower current density, the distribution of which approximately corresponded with that of precipitated Sn particles.抄録全体を表示PDF形式でダウンロード (1064K) -
松原 弘美, 品田 與志榮, 加藤 鋭次1992 年 42 巻 10 号 p. 555-560
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーEffect of strontium addition on the gas pick-up and porosity formation in AC4CH alloys have been investigated. The alloys melt were held in the controlled humidity. It has been demonstrated that the gas pick-up occurs from the reaction between the moisture in the atmosphere and the aluminum melt rather than the reaction between the moisture and the strontium. There is less strontium loss in the moist argon atmosphere than in the noncontrolled atmosphere. The loss of strontium and the gas pick-up proceed faster in the melt of secondary alloy ingots than of new alloy ingots. Consequently much porosity is observed in the conical casting from a secondary alloy melt. Conical castings modified with strontium are more prone to exterior shrinkage in the case of lower gas content. However, the higher the gas content, the more gas pores are formed, thus reducing the volume of interior shrinkage.抄録全体を表示PDF形式でダウンロード (942K) -
松木 賢司, 井川 忠司, 松本 博明, 時澤 貢, 磯貝 光之, 村上 哲1992 年 42 巻 10 号 p. 561-567
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーAn aluminum alloy composite (MA7075+10SiC alloy) has been developed to show high strain rate superplasticity in tension and compression test. Fibers of 7075-0.3 mass%Zr alloy made by a metal cutting chatter technique were mixed with SiC particles by using vibrational ball mill, compacted in nitrogen atmosphere, and then pre-strained at 793K. After the pre-straining, SiC particulates are distributed uniformly within matrix, and a fine grain structure, with average grain size of about 0.8μm is developed. In a strain rate range of 5×10-1 to 1×10s-1 at 793K, the MA7075+10SiC specimen can be compressed to about 0.65 strain without surface cracking under very low flow stress level. The observed m value is larger than 0.3. In tensile test of the MA7075+10SiC specimens warm rolled after the pre-straining, maximum elongation of about 315% is obtained at an initial strain rate of 5 s-1 at 793K. The very fine grain (or subgrain) structure of the composite material is considered to be reason of superplasticity in such a high strain rate range.抄録全体を表示PDF形式でダウンロード (1342K) -
大橋 照男1992 年 42 巻 10 号 p. 568-573
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーHypermonotectic Al-Pb alloys have been rapidly solidified by a melt spinning device and the resultant ribbon-shaped alloys were consolidated by a combination of vacuum hot-press and hot-extrusion. The microstructures of these alloy have been investigated by TEM observations. In the melt-spun alloys a bimodal distribution of Pb particles which are classified into "corse" and "fine" ones having a mean diameter of 50 and 10nm, respectively, are shown. These Pb particles have a truncated octahedral shape surrounded with {100} and {111} facets, and indicate a cube-cube crystallographic orientation relationship with the matrix. The ratiof surface energy of {111} to that of {100} facets of solid Pb embedded in solid Al changes from the theoretical value of 1.15 to 1 with increasing in the size of Pb particles. Hot-extrusion leads the "fine" Pb particles to enlarge and breaks the dependence of anisotropy of the surface energy on the Pb particle size.抄録全体を表示PDF形式でダウンロード (2232K) -
水嶋 輝夫, 犀川 浩, 峯岸 知弘, 山根 壽己, 荒木 秀樹1992 年 42 巻 10 号 p. 574-577
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーTensile tests were performed on aluminum tricrystals which have parallel constituent single crystals. The tricrystals show flow stresses much higher than those predicted from a rule of mixture of constitutional single crystals. This indicates that the resistance of grain boundaries to dislocations motion is large. The high dislocation density near grain boundaries is confirmed by hardness measurements.抄録全体を表示PDF形式でダウンロード (668K) -
上谷 保裕, 石動 正和, 松田 健二, 多々 静夫, 池野 進1992 年 42 巻 10 号 p. 578-584
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーThe crystal structure of grain boundary precipitates in an Al-1 mass%Mg2Si alloy containing exess Si was investigated by transmission electron microscopy. At a peak aged condition where the marked intergranular fracture occurs, the same diffraction patterns are observed from both the grain boundary precipitates and the matrix precipitates. These precipitates may be considered as an intermediate phase from the analysis of the diffraction patterns. The equibrium precipitate (Mg2Si) is not observed on grain boundary. The size as well as number of grain boundary precipitates are almost independent of the misorientation, on the grain boundaries with misorientations larger than 10 degrees. While on grain boundaries with misorientation of 2 degrees, the size is much smaller and the number is anomalously larger as compared with those of the large angle boundaries.抄録全体を表示PDF形式でダウンロード (2163K) -
牧本 昭一, 中野 俊彦, 多田 裕志1992 年 42 巻 10 号 p. 585-592
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (885K) -
長村 光造1992 年 42 巻 10 号 p. 593-601
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (1020K) -
小林 俊郎1992 年 42 巻 10 号 p. 602-603
発行日: 1992/10/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (277K)
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