巻号一覧
43 巻, 3 号
選択された号の論文の11件中1～11を表示しています
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松田 健二, 寺崎 稔, 多々 静夫, 池野 進1993 年 43 巻 3 号 p. 127-133
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーThe effects of deformation on the aging in five kinds of Al-Mg2Si alloys have been investigated by Vickers microhardness test and electron microscopy. In Al-0.4%Mg2Si alloy, the maximum hardness during aging was small. Both intermediate and equilibrium phases were detected in the specimen peak-aged at 473K without predeformation, though no equilibrium phase was observed in cold-rolled and peak-aged specimen. In Al-1.0%Mg2Si and Al-1.6%Mg2Si alloys, there were several combinations of cold-rolling and aging condition under which the maximum hardness of the non-deformed specimens was nearly equal to that of the deformed specimens. In Al-0.4%Mg2Si and Al-0.6%Mg2Si alloys, the age hardenability, which is given by the difference between the maximum hardness and the initial hardness is larger in cold-rolled specimen than in non-rolled specimen. However, the age hardenability of both Al-1.0%Mg2Si and Al-1.6%Mg2Si alloys is larger in non-rolled specimens than in rolled specimens.抄録全体を表示PDF形式でダウンロード (1465K) -
伊藤 勲, 乙黒 靖男, 土井 多佳夫, 生田 一雄1993 年 43 巻 3 号 p. 134-138
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーThe effects of element (Cu, Mg, Zn, Ti, Si, Bi, Cr, Ni) adddition and surface roughness on the diffusion weldability of zirconia and Al-Sn alloys were investigated. The welding was carried out in the temperature range between 673 and 873K for 1.8, 3.6 and 7.2ks under the pressure of 1, 2 and 4MPa in the atmosphere, respectively. During welding the liquid Sn containing Mg filled the interface prevented it from the attack of oxidation. The couple of zirconia and aluminum alloy containing both Sn and Mg showed higher shear strength than that of the couple of zirconia and Al-Sn alloy. The couple mentioned above was fractured at the aluminum alloy side in the shear tension test.抄録全体を表示PDF形式でダウンロード (1199K) -
大笹 憲一, 大宮 光裕, 大参 達也, 工藤 昌行1993 年 43 巻 3 号 p. 139-145
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーThe solidification paths of Al-Ge-Si ternary alloy under the conditions of the equilibrium and non-equilibrium solidification were analyzed on the basis of the thermodynamic calculation. Subregular solution model was used to describe the Gibbs free energy of the ternary solution phases such as liquid, fcc and diamond structure phases. The excess free energy of the ternary solution phases were calculated from the interaction parameters of the three binarysystems which construct the ternary system. In order to confirm the validity of the calculation, thermal analysis of Al-25.5%Ge-16.0%Si ternary alloy was carried out and the Ge content of primary crystals in the solidified alloy was measured by an electron probe micro analyzer. As a result, the measured Ge content agreed well with the calculated one, and the measured temperatures at the start of solidification, the start of eutectic reaction and the end of solidification corresponded completely with the calculated non-equilibrium solidification path.抄録全体を表示PDF形式でダウンロード (881K) -
柳川 政洋, 大家 正二郎, 安倍 睦1993 年 43 巻 3 号 p. 146-151
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーThe age-hardening process of Al-Mg-Si-(Sn) alloys was investigated by means of a tensile test. The kinetics of the age-hardening was analysed based on the activation energy. The results indicates that the age-hardening in Al-Mg-Si-(Sn) alloys is controlled by the migration of mobile magnesium-silicon-vacancy clusters, and the activation energy for the process varies from 0.7-1.1eV for the early stages of aging to 1.3-1.5eV for the later stages. Furthermore, the activation energy changes by addition of tin as well as excess silicon. The change in the activation energy is explained by assuming that the activation energy is affected by the concentration of quenched-in vacancies contained in magnesium-silicon clusters.抄録全体を表示PDF形式でダウンロード (640K) -
中田 博道, 長 隆郎, 金武 直幸1993 年 43 巻 3 号 p. 152-158
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーA novel technique has been developed for fabricating in situ formed TiCp/Al composites. In this process, fairly stable TiC particles were in situ synthesized in liquid aluminum by the interfacial reaction between an Al-Ti melt and SiC, which is a comparatively unstable carbide from the view-point of thermodynamics. It is possible in the present process to generate TiC particles of nearly 1μm in diameter, even utilizing SiC of 14μm as raw material. However, the dispersion behavior of TiC particles in the matrix depends on the size of the raw material SiC. Decomposing finer SiC makes the dispersion of_TiC particles more uniform and the mechanical properties of composites are improved accordingly. The structure of in situ composites and their mechanical properties are affected by the fabrication temperature and the stirring time. It has been found that the most suitable condition for fabrication should be applied depending on the size of the raw material, even if the same kinds of carbide are used. Furthermore, although Al-Ti-Si system intermetallic compounds were detected in a TiCp/Al-Si composite which was fabricated by conventional melt stirring method, these compounds can not be observed in a TiCp/Al-Si composite made by this in situ production method. Hence, the mechanical properties of the in situ TiCp/Al-Si composite are superior to those of the conventional TiCp/Al-Si composite.抄録全体を表示PDF形式でダウンロード (1577K) -
重松 一典, 中村 守, 金山 公三, 小塚 晃透1993 年 43 巻 3 号 p. 159-164
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーExperiments of piercing TiAl intermetallic compound using single mode pulse CO2 laser were carried out. Influences were examined of kinds of assist gases and thicknesses of workpieces on piercing behavior. Radii and circularity of the holes were measured. The length of cracks propagating from the holes during piercing and hardness distributions near the holes were also evaluated. TiAl specimens of thickness of 4mm are able to be pierced by CO2 laser. The maximum value of the ratio of the specimen thickness to the hole diameter achieved is about 10. With O2 as assist gas, specimens can be pierced by lower beam power than that for piercing them with N2 or Ar. Kinds of assist gases, average beam power and thicknesses of specimens influence the length of cracks propagating from the holes. TiAl near the holes is hardened by piercing apparently.抄録全体を表示PDF形式でダウンロード (1235K) -
宮沢 賢二1993 年 43 巻 3 号 p. 165-170
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーAbnormally large thermal cracks were accidentally observed on surfaces of rolls by continuous casting of aluminum. Effects of quenching and tempering condition on resistance to heat checking and high temperature strength of an alloy roll steel was investigated to settle the problem. When an austenitizing temperature is kept constant, the largest resistance to heat checking of the roll steel is obtained in a tempering temperature range between 450°C and 550°C. The resistance to heat checking and the high temperature strength increases with increasing austenitizing temperature.抄録全体を表示PDF形式でダウンロード (767K) -
三井 浩次郎, 安孫子 哲男, 上田 文生, 難波 圭三1993 年 43 巻 3 号 p. 171-178
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (1609K) -
中川 弘昭1993 年 43 巻 3 号 p. 179-181
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (294K) -
大西 忠一1993 年 43 巻 3 号 p. 182-183
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (256K) -
土田 信, 稲葉 隆, 小山 克巳1993 年 43 巻 3 号 p. 184-185
発行日: 1993/03/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (252K)
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