軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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61 巻, 10 号
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研究論文
  • Al–9%Si–0.3%Mgダイカスト合金のT5熱処理挙動における予備時効条件の影響
    井上 達也, 後藤 真英, 山口 篤司, 大竹 哲生, 黒田 明浩, 吉田 誠
    原稿種別: 研究論文
    2011 年 61 巻 10 号 p. 507-512
    発行日: 2011/10/30
    公開日: 2011/12/01
    DOIhttps://doi.org/10.2464/jilm.61.507
    ジャーナル フリー
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    Effect of pre-aging conditions on T5 heat treatment behavior of Al–9.0%Si–0.3%Mg die-casting alloy was investigated by using hardness measurement, differential scanning calorimetric analysis (DSC) and transmission electron microscopy (TEM). T5 treated alloy showed the positive effect on the two-step aging at pre-aging temperatures between 273 and 343 K, unlike T6 treated alloy which showed the negative effect at pre-aging temperatures below 343 K. The positive effect on two-step aging seems to be the characteristic behavior at T5 heat treatment. Difference of two-step aging behavior between T5 and T6 treatments seems to result from the difference of cluster (1) formed in the pre-aging process below 343 K. Higher water-quenching temperature after casting tended to increase the hardness after artificial aging.
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  • マグネシウム合金とチタン合金の接着強度と振動減衰特性に及ぼす陽極酸化処理の影響
    高橋 芳弘, 金刺 貴之, 坂本 幸弘, 高谷 松文, 船見 国男
    原稿種別: 研究論文
    2011 年 61 巻 10 号 p. 513-517
    発行日: 2011/10/30
    公開日: 2011/12/01
    DOIhttps://doi.org/10.2464/jilm.61.513
    ジャーナル フリー
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    In this study, effects of the anodizing condition on the bonding strength and the damping properties of the bonding specimen were investigated. The specimens bonded Ti–6Al–4V alloys to AZ31 magnesium alloys with epoxy resin adhesives were used. A porous anodic oxidation film of about 4 μm thickness was formed on the Ti–6Al–4V alloy surfaces by anodizing. The Vickers hardness of anodized Ti–6Al–4V alloy specimen was increased two times higher than that of non-treated specimen. And then, the bonding strength measured by the adhesion tester was also increased. The damping characteristics of bonded specimen were examined through experiments of the collision sound and the reaction velocity of pendulum. As a result, in comparison to the no-treated specimen, the damping performances of anodized Ti–6Al–4V titanium alloy specimens were increased and restitution coefficients of that were decreased. On the other hand, the tonal component of the AZ31 magnesium alloy was reduced in the lower register below 1 kHz. It was also demonstrated that the damping performance of the bonding specimen was improved depending on the anodic oxide coating and adhesive.
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  • 降温多軸鍛造AZ91マグネシウム合金の組織と機械的性質
    三浦 博己, 劉 恒喆
    原稿種別: 研究論文
    2011 年 61 巻 10 号 p. 518-524
    発行日: 2011/10/30
    公開日: 2011/12/01
    DOIhttps://doi.org/10.2464/jilm.61.518
    ジャーナル フリー
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    AZ91 magnesium alloy was multi-directionally forged (MDFed) under decreasing temperature condition from 673 to 413 K up to cumulative strain of ΣΔε=6.4 at a strain rate of 3×10−3 s−1. The average grain size decreased gradually with cumulative strain. After straining to ΣΔε=6.4 (i.e., after 8 passes of MDF) , equi-axed ultrafine grains (UFGs) with average size of about 0.45 μm were uniformly evolved. The hardness increased gradually up to 1.2 GPa with decreasing grain size. While the yield stress was also raised up to 480 MPa, the ductility was not so changed, i.e., 20% at max and about 10% in average. The total strain to fracture in compression was slightly poorer than that obtained by tensile test. The achieved high strength of the MDFed AZ91 magnesium alloy seemed to be induced by strengthening by the effects of grain refinement and distribution of fine precipitates. However, it is revealed that the relatively lower ductility of the UFGed AZ91 magnesium alloy compared with UFGed AZ31, AZ61 magnesium alloys should be induced by coarse precipitates remained.
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  • 八分割しわ抑え板を用いたアルミニウム板の摩擦援用深絞り加工
    畑中 伸夫, 末永 亮, 飯塚 高志, 高倉 章雄, 山口 克彦
    原稿種別: 研究論文
    2011 年 61 巻 10 号 p. 525-531
    発行日: 2011/10/30
    公開日: 2011/12/01
    DOIhttps://doi.org/10.2464/jilm.61.525
    ジャーナル フリー
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    A novel process of friction aided deep drawing has been developed by employing divided blank holder. In this process, a conventional circular blank holder is divided into eight segments, each of which can move radially inwards and outwards. When these segments are compressed in the axial direction, the frictional force is generated at the contact surface between a sheet blank and the blank holding segments. These frictional forces contribute to the drawing deformation of a sheet blank on the flange portion. Deep drawn cups can be produced successfully by repeating such operations of loading and unloading. The cup surface also becomes satisfaction compared with the case of four segments. Deep drawing experiments were carried out to improve the surface condition, the shape and dimensions of cups. A supplemental punch is also used to carry a small amount of drawing force and to keep the size and shape of the drawn cup. The experimental resu1ts show that the deep drawing of soft aluminum sheets of 0.5 mm in thickness was produced by repeating this drawing process. A potential of the proposed process was confirmed by successfully producing deep cups 74 mm in height with a drawing ratio of 4.0.
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  • 重力鋳造したAM60マグネシウム合金の時効硬化に及ぼす結晶粒径の影響
    古井 光明, 高野 浩史, 池野 進, 山口 友康, 才川 清二
    原稿種別: 研究論文
    2011 年 61 巻 10 号 p. 532-537
    発行日: 2011/10/30
    公開日: 2011/12/01
    DOIhttps://doi.org/10.2464/jilm.61.532
    ジャーナル フリー
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    Magnesium and its alloys are well-known as the lightest metallic structure material with excellent castability and specific strength. Those good mechanical properties are very attractive for industrial applications in automobile and portable electronic devices. Above all, AM60 magnesium alloy is manufactured from the pressure die casting process with chiefly high accuracy and productivity, but actual use and research using gravity casting with lower cooling rate is less than the die casting method, and there are a multitude of unknown things regarding solidification behavior and microstructure evolution. Our recent studies showed that continuous precipitation is covered by the whole of crystal grain with aging in AM60 magnesium alloy cast into permanent molds, which have the average grain size of 75–85 μm. On the other hand, continuous precipitation stays on the periphery of the crystal grain boundary with aging in the same cast into a sand mold, having the average grain size of 138–147 μm. It's thought that permanent mold castings have the age hardening behavior of intragranular precipitation participation type that is influenced by continuous precipitates. It's also thought that sand mold castings have the age hardening behavior of grain boundary participation type that is influenced by cellular precipitates. In this study, AM60 magnesium alloy with bigger grain size was used to detect the effect of grain size on age hardening behavior.
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  • 7075-T6アルミニウム合金の水素脆化感受性に及ぼす湿潤空気温度の影響と粒界割れの発生基準
    中島 優太郎, 春山 繁之, 上西 研, 大﨑 修平
    原稿種別: 研究論文
    2011 年 61 巻 10 号 p. 538-543
    発行日: 2011/10/30
    公開日: 2011/12/01
    DOIhttps://doi.org/10.2464/jilm.61.538
    ジャーナル フリー
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    The effect of test temperature on the susceptibility to hydrogen embrittlement (HE) of a high-strength aluminum alloy 7075 with T6 (peak-aged) temper was examined using the slow strain rate technique (SSRT) under a strain rate 1.39×10−6 [1/s]in 65% relative humidity air at temperatures between 10°C and 80°C. On the basis of understanding the condition among stress, strain and time leading to intergranular cracking (IGC) and its temperature dependence, the controlling criterion of IGC initiation by HE was studied. The HE susceptibility increased with increasing temperature and the IGC extension (initiation and propagation) was more promoted. Both the unstressed pre-exposure time in 90% relative humidity air at 30°C and the elastic deformation time in SSRT tests had little effect on the embrittlement behavior. The time parameter defining the IGC initiation was recognized as the plastic deformation time ti (p) until reaching the maximum load. The activation energy evaluated from Arrhenius plots of 1/ti (p) was 16.4 [kJ/mol], nearly equal to the reported value for lattice diffusion of hydrogen in a pure aluminum or alloy 7050-T6. It is supported from these results and analysis that a high hydrogen concentration attained at the site near surface by lattice diffusion controls the IGC initiation.
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