軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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66 巻, 5 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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解説
研究論文
  • Mg–Al–(Zn)–Ca系マグネシウム合金板材の組織および機械的特性に及ぼすAl濃度およびZn添加の影響
    斎藤 尚文, 鈴木 一孝, 福田 裕太, 伊藤 友美, 野田 雅史, 権田 善夫, 千野 靖正
    2016 年 66 巻 5 号 p. 246-251
    発行日: 2016/05/30
    公開日: 2016/06/30
    DOIhttps://doi.org/10.2464/jilm.66.246
    ジャーナル フリー
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    Effects of Al concentration and Zn addition on microstructures and mechanical properties of Mg–Al–(Zn)–Ca series magnesium (Mg) alloy medium plates were investigated. Concerning to mechanical properties of AMX (Mg–Al–Ca) alloys with various Al concentrations, which were processed by rolling at 523 K and final annealing at 473 K, good balance of tensile strength and failure elongation were obtained, when Al concentration was 8 mass%. When Al concentration was more than 9 mass%, however, both tensile strength and failure elongation were deteriorated due to coarsening of Al–Ca compounds. Concerning to mechanical properties of AZX (Mg–Al–Zn–Ca) alloys with various Al concentrations and 1 mass% Zn addition, which were processed by the same procedure with AMX alloys, enhancement of tensile strength without deterioration of failure elongation was attained at Al concentration of 6–8 mass%, when the tensile direction was parallel to the rolling direction. Clear deterioration in failure elongation compared with AMX alloys were observed, however, when the tensile direction was perpendicular to the rolling direction. 1 mass%Zn addition to AMX alloy promoted precipitation of fine Mg17Al12 particles, which likely affected mechanical properties. In addition, solid solution of Zn in AMX alloy likely contributed to enhancement of tensile strength.
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  • Mg–6%Al–1%Zn–2%Ca合金のMIG溶接
    瀧川 順庸, 味原 颯大, 松下 遼, 上田 光二, 木ノ本 裕, 上杉 徳照, 東 健司
    2016 年 66 巻 5 号 p. 252-257
    発行日: 2016/05/30
    公開日: 2016/06/30
    DOIhttps://doi.org/10.2464/jilm.66.252
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    Effect of metal inert gas (MIG) welding parameters on tensile strength of weld joints in a Mg–6%Al–1%Zn–2%Ca (AZX612) flame retardant magnesium alloy was examined. Proper welding conditions were found by examining welding current from 70 to 140 A and welding speed from 45 to 70 cm/min. The ultimate tensile strength of weld beads was more than 70% of the strength of the base metal in all the conditions examined. The fracture origin was not Al2Ca second phase or Al–Mn particles, which was the fracture origin of the base metal, but blowhole or oxide inclusion. High weld strength was obtained in low heat input conditions, in which blowhole formation was suppressed. In case that an oxidized MIG welding wire was used for welding, the weld strength decreased and the large oxide fracture origin with the size of 2 mm was found. To obtain high weld strength, it is important to choose proper welding conditions in which blowhole formation was suppressed and to suppress the oxidation of MIG welding wire.
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  • 小型衝撃三点曲げ試験機の試作およびMg–6%Al–1%Zn–2%Ca合金の衝撃破壊特性評価
    長谷 貴之, 川 智明, 池尾 直子, 向井 敏司
    2016 年 66 巻 5 号 p. 258-265
    発行日: 2016/05/30
    公開日: 2016/06/30
    DOIhttps://doi.org/10.2464/jilm.66.258
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    Mechanical properties of magnesium alloys under dynamic loading are still unclear. To evaluate the impact fracture behavior of magnesium alloys, we constructed a novel impact three-point bending test apparatus using three elastic bars with Charpy standard-size specimen, and investigated the impact fracture properties of as-cast Mg–3%Al–1%Zn (hereafter denoted as AZ31) alloy. Finite element (FE) analysis were carried out to estimate the effect of inertial force of the specimen during the impact three-point bending. Based on the FE analysis, we successfully developed a small-scale apparatus for examining a quarter-size specimen, which was capable of carrying out the impact three-point bending test with minimized influence of the inertial force. Impact fracture behavior of Mg–6%Al–1%Zn–2%Ca (hereafter denoted as AZX612) alloy was estimated and compared by using small-scale apparatus. The experimental results pointed out that the AZX612 had had similar energy absorption capability to AZ31 against the dynamic loading, however, the crack propagation speed of the Ca bearing alloy was almost twice as fast as that of the AZ31 alloy.
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  • Mg–6%Al–1%Zn–2%Ca合金押出材の応力腐食割れと耐食性
    湯浅 元仁, 行武 栄太郎, 黄 新胜, 鈴木 一孝, 斎藤 尚文, 千野 靖正
    2016 年 66 巻 5 号 p. 266-272
    発行日: 2016/05/30
    公開日: 2016/06/30
    DOIhttps://doi.org/10.2464/jilm.66.266
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    Stress corrosion cracking (SCC) and corrosion resistance of Mg–6 mass%Al–1 mass%Zn–1 mass%Ca (AZX612) extruded alloy were investigated by slow strain rate tensile tests (SSRT) in 0.01 M NaCl solution and immersion tests in 5 mass% NaCl solution, and compared with those of Mg–6 mass%–1 mass%Zn (AZ61) extruded alloy. In the SSRT in the salt solution, as-received AZX612 exhibited lower elongation and higher SCC susceptibility than those of as-received AZ61, indicating that calcium addition in Mg–Al alloy deteriorated SCC resistance. On the other hand, after solution treatment, improvement of elongation and SCC susceptibility occurred in both the alloys. Observation of surface profiles for AZX612 and AZ61 after the SSRT in salt solution revealed that corrosion pits on surface likely initiated SCC in both the alloys. The results of immersion tests showed the same tendency with those of SSRT in salt solution. It is suggested that SCC resistance of AZX612 and AZ61 was likely related to the microstructural change accompanied with calcium addition and solution treatment such as the change in distributions of Al2Ca phase and Al-rich phase.
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  • マグネシウム合金の発火温度に及ぼす測定条件の影響
    鈴木 一孝, 斎藤 尚文, 黄 新胜, 湯浅 元仁, 千野 靖正
    2016 年 66 巻 5 号 p. 273-279
    発行日: 2016/05/30
    公開日: 2016/06/30
    DOIhttps://doi.org/10.2464/jilm.66.273
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    Effects of process parameters such as air flow rate, heating rate, sample surface area, and sample compositions on ignition temperature of magnesium alloys with and without calcium were investigated using differential thermal analysis. For magnesium alloys without calcium, an increase in heating rate, air flow rate, and sample surface area contributed to a decrease in ignition temperature, and an increase in aluminum concentration promoted an increase in ignition temperature at least in the present experimental conditions. For magnesium alloys with calcium, adding 2 mass% calcium contributed to a significant increase in ignition temperature. Effects of flow rate, sample surface area and aluminum concentration on ignition temperature exhibited qualitatively the same tendency between magnesium alloys with and without calcium. For air flow rate, however, an opposite trend was observed between them. Ignition temperatures obtained in this study were much higher than in the literature, likely due to large differences in the sample surface area.
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