軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
34 巻, 3 号
選択された号の論文の9件中1~9を表示しています
  • 中田 栄一
    1984 年 34 巻 3 号 p. 149-150
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
  • 大内 宏
    1984 年 34 巻 3 号 p. 151-156
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
    Especially high silicon containing Al-Si alloy castings were tried to refined of primary silicon crystals. The melt were treated by flux included phosphorus. Even primary silicon of the Al-50%Si alloy was also able to refined, and its sizes were under 150μ, and yet primary silicon sizes of other alloys were about 100μ at 40%Si, 70μ at 30%Si, and 30μ at 20%Si.
    Al-(2050%) Si alloys were tested with thermal shock. The specimen of column shape with 23mm dia; 23mm height were quenched into ice water bath after heated at 500°C for 20min. This treatment was repeated until 500 cycles. Deformation of specimen was reduced with increasing of silicon content. Simultaneously hair cracks occured at all round of specimen and it expanded. But 2025%Si alloys of lower silicon content deformed largely. Therefore Al-(3035%) Si alloys showed excellent thermal shock resistance, that is to say, deformation was small and break out cracks were scarcely.
  • 当摩 建, 工藤 元, 竹内 庸
    1984 年 34 巻 3 号 p. 157-164
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
    Anodic polarization characteristics and corrosion resistance of Al-0.1%Sn alloys containing Zn up to 0.3% were examined in NaCl and AlCl3 solutions. Remarkably less noble characteristics and abnormally low corrosion resistance of solution treated Al-Sn alloys are greatly improved by an addition of Zn0.2% or more. Localized dissolution morphology of Al-Sn-Zn alloys is controlled mainly by dissolution potential, that is, canal-like and (100) type of crystallographic pits are observed in the solution treated and precipitation treated noble alloys respectively. Zn addition has little effect on the microstructure of Al-Sn alloys both solution treated and precipitation treated. A small amount of Zn addition is effective to improve electrochemical properties of Al-Sn alloys in practical use.
  • 菊池 迪夫, 武田 裕正, 諸住 正太郎
    1984 年 34 巻 3 号 p. 165-173
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
    Interfaces of friction-and explosive-welded aluminium-mild steel joints, before and after annealed for 1h at temperatures between 350° and 500°C, were examined by tensile test for bonding strength, and by optical and electron micrographies, and EPMA for phases in intermediate reaction-layers. Results obtained are as follows:
    (1) Bonding strength of friction-welded joint in the as-welded state is lower but that of explosive-welded joint is higher than the tensile strength of wrought aluminium, say 86 MPa.
    (2) The bonding strength of friction-welded joint decreases to almost the same level, say 56 MPa, by annealing at temperatures between 350° and 500°C, while that of explosive-welded joint decreases with increase in annealing temperature and becomes lower than the fracture strength of annealed aluminum matrix after annealing at and above 450°C, which is also lower than that of friction-welded joint annealed at the same temperatures.
    (3) The intermediate reaction-layer of friction-welded joint consists mainly of fine aluminum and Fe4Al13 grains at the aluminum side, and ion and columlar Fe2Al5 grains at the steel side in the layer. Meanwhile, the interface of explosive-welded joint consists of three kinds of interfacial zones; those are massive fused zone, thin fused zone, and non-layer zone.
    (4) The fused zone consists of two parts; one, named as matrix, is composed with Al phase and network of fine Fe2Al5 particles, and the other is such as it looks as if it were a one-phase particle with lower Fe concentration than that of Fe4Al13 but is a mixture of the matrix and compounds, mainly Fe4Al13 and seldom Fe2Al5 in large particles.
    (5) By annealing, the intermediate layer of friction-welded joint does not grow largely. In explosive-welded joint, however, the layer of Fe2Al5 grows by annealing at 450°C in the non-layer interface, and this lowers the bonding strength.
  • 南埜 宜俊, 山根 寿巳, 下村 昭夫, 島田 昌彦, 小泉 光恵, 小川 紀之
    1984 年 34 巻 3 号 p. 174-181
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
    Interdiffusion in the Al-2.07at%Ag alloy was investigated under high pressure up to 3.24 GPa at the temperature range from 698K to 897K. The interdiffusion coefficients, activation energy and volume were determined. The diffusion coefficients decrease with pressure, while activation energy increases with pressure. The activation volume of interdiffusion is 7.77.8×10-6m3/mol at the temperature range from 783K to 897K. The calculated activation volume of impurity diffusion of Ag in Al is 8.08.1×10-6m3/mol. It is suggested from the fact that the Ag diffusion in Al is dominated by the single vacancy mechanism in the temperature range from 783K to 897K.
  • 皆川 一泰, 伊豆 正弥, 佐藤 栄一, 糸井 康彦
    1984 年 34 巻 3 号 p. 182-189
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
    High purity aluminum was electrolyzed potentiostatically at various potentials in adjusted pH for 12 h. The relationship was investigated between the quantity of Al3+ in solution analyzed by oxine-chloroform extraction method and that of electricity determined by schematic integration from the time variation curve of current density. Taking an internal catholic reaction change in pH and formation of coating into account, the anodic current is caused by the reaction
    Al-Al3++3e-
    In alkaline solution, Al3+ migrates into solution by chemical dissolution of coating not directly through coating. In anodic and neutral solutions, Al3+ migrates into solution through coating.
  • 財満 鎮雄, 高辻 雄三, 水谷 秀行, 鈴木 雅弘
    1984 年 34 巻 3 号 p. 190-197
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
    Some considerations of tool wear in AC5A-T6 cutting are presented. The tool wear was examinend mainly by EPMA being compared with the case of 7075-T6 cutting. In this tests, four kinds of high speed steel tool, i. e. SKH4, SKH51, SKH55 and SKH57 tools and also a carbide tool K 10 were used. The results can be summarized as follows:
    The tool wear in AC5A cutting was relatively smaller than the case of 7075-T6 cutting, but in general, a fairly large tool wear was found when high speed steel tools were used. The each tool wear of SKH51, SKH55 and SKH4 tool was relatively large, but SKH57 tool wear was relatively small. Especially K 10 tool wear was very small. In AC5A cutting, it seems that the tool wear is affected not only by abrasive wear by hard particles such as NiAl3 and CuAl2 etc. which are expected to exist in the AC5A structure, but also by adhesive wear. The adhesive wear is produced because of the chemical affinity which the elements, that are aluminum, copper, nickel and magnesium in the work material, have with the tool material.
  • 吉廣 一秀, 泉谷 正隆
    1984 年 34 巻 3 号 p. 198-204
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
  • 馬場 宣良
    1984 年 34 巻 3 号 p. 205-211
    発行日: 1984/03/31
    公開日: 2008/07/23
    ジャーナル フリー
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