巻号一覧
26 巻, 7 号
選択された号の論文の7件中1～7を表示しています
- |<
- <
- 1
- >
- >|
-
小松 二郎1976 年 26 巻 7 号 p. 309-310
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (282K) -
小宮山 芳朗, 内田 邦彦, 郡市 政広1976 年 26 巻 7 号 p. 311-319
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーAl-Si-Cu-Mg casting alloys which are commonly used contain several other elements, some of which are beneficial and others not. The effects of iron, manganese, zinc and titanium on mechanical properties and microstructures of Al-9.2Si-4Cu-0.5Mg alloy were investigated and the experimental results were analyzed statistically. The following results were obtained.
(1) Zinc content up to 2 percent and titanium content up to 0.2 percent have little effects on tensile properties and hardness of permanent mold castings of this alloy.
(2) With increasing iron content, hardness increases but tensile strength and elongation decrease.
(3) Tensile strength markedly decreases when iron content exceeds 0.5 percent.
(4) Manganese addition reduces the harmful effect of iron since the needle type structure of K compound and FeAl3 compound is replaced by aluminum-manganese-iron compound.
(5) A small addition of manganese is usually considered to be desirable. Whereas in larger quantities, it has a harmful effect.
(6) A manganese addition of about 0.5 percent results in improved properties of this alloy.抄録全体を表示PDF形式でダウンロード (2812K) -
森棟 文夫, 早瀬 晴文, 新宮 秀夫, 小林 紘二郎, 尾崎 良平1976 年 26 巻 7 号 p. 320-326
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーThe difference in the grain refining capacity of Al-Ti grain refiners with and without TiC is examined.
As a result of experimental investigations by EPMA, X-ray diffraction analysis, electrical conductivity measurement and grain counting for cast samples prepared under various thermal conditions, the following conclusions were obtained;
(1) TiC particles are effective in refining Al grains, particularly when high content of Ti is dissolved in Al melt.
(2) TiC particles are fairly stable in Al melt but decompose gradually during isothermal holding. The rate of decomposition is strongly temperature dependent.
(3) TiAl3 particles can act as the nucleation center for Al when they exist in the liquid but the rate of dissolution of these particles is much faster than the rate of decomposition of TiC.
(4) The refinement due to the crystal-multiplication can be promoted by the existence of Ti in solution in certain freezing conditions.抄録全体を表示PDF形式でダウンロード (2489K) -
柴田 喜三, 大塚 一郎, 穴田 敞一, 山辺 成雄, 草開 一夫1976 年 26 巻 7 号 p. 327-335
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーExtrusion tests were carried out on 6063 alloy ingots in which Mg2Si particles were precipitated by isothermal precipitation treatment or by slow cooling after homogenizing. Extrudability of ingots was estimated by the extrusion pressure, the critical extrusion rate to cause tearing on the surface of extrusions and mechanical properties of extrusions. The principal results obtained are summarized as follows.
(1) Coarse particles of Mg2Si, particularly precipitated at about 400°C, reduce the extrusion pressure.
(2) Such coarse particles are the cause of tearing, thus, reduce the critical extrusion rate.
(3) Coarse particles of Mg2Si, particularly precipitated by slow cooling from homogenizing temperature, can not be disolved completely during extrusion process, and thus reduce tensile strength of extrusions after artificial aging.抄録全体を表示PDF形式でダウンロード (1890K) -
大森 梧郎1976 年 26 巻 7 号 p. 336-346
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーThe effect of lanthanum and cerium on cold workability of polycrystalline magnesium was investigated by means of hardness measurements, optical and transmission electron microscopy and examination of rolling textures obtained by Schulz's reflection method.
The maximum cold rolling reduction without cracking increased with increasing concentration of lanthanum and cerium up to 0.2wt%. It was found that cerium was more effective than lanthanum to improve cold workability of magnesium.
The deformation structure of an alloy containing 0.2wt% lanthanum or cerium at low reduction was much more uniform, and consequently compression bands developed afterwards were distributed more uniformly throughout the specimen, in comparison with pure magnesium and low concentration alloys.
It appears reasonable to consider that the compression band observed in this work consists of a number of {1011} and {1015} twins. The feature of rolling texture was not altered by addition of lanthanum and cerium, however pole densities of {0002} and {1011} for the alloys were lower than those of pure magnesium at the same rolling reduction.
At the final stage of deformation, cracks formed at the boundary region between the matrix and compression bands, and then propagated along the grain boundary.抄録全体を表示PDF形式でダウンロード (2247K) -
宇野 照生, 馬場 義雄1976 年 26 巻 7 号 p. 347-355
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーAn investigation was carried out to clarify the effect of various final thermomechanical treatments (FTMT) on the mechanical properties of Al-Zn-Mg-Cu base alloys. The results are summerized as follows;
(1) Al-Zn-Mg-Cu alloy plates processed by FTMT exhibit better combination of strength vs. elongation as well as higher strength than those of conventionally processed plates.
(2) Sufficient preaging after quenching, warm deformation less than 30% and final aging at slightly lower temperature than that of conventional T6 temper are desirable in obtaining marked improvement in mechanical properties by FTMT.
(3) 7178 alloy processed by FTMT exhibits better combination of strength vs. elongation than that of 7075 alloy. Yield strength of 7178 alloy plates can be raised up to 70 kg/mm2 by FTMT.
(4) A high purity 7178 alloy processed by FTMT exhibits the same combination of strength vs. elongation as a commercial purity alloy.抄録全体を表示PDF形式でダウンロード (1436K) -
清水 義彦, 山田 一雄1976 年 26 巻 7 号 p. 356-377
発行日: 1976/07/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (2578K)
- |<
- <
- 1
- >
- >|