J0405-4-3 4元系FeGaAlC合金の磁気特性および機械的強度に及ぼすC添加量(知的材料・構造システム(4) アクティブマテリアル)

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We developed (Fe_<0.80>Ga_<0.15>Al_<0.05>)_<98.5>C_<1.5> [at.%] alloy which has high strength (more over 600MPa), but magnetostriction decreased to 40-50 ppm. Because A2 phase changes to Ll_2 phase (Fe_3GaC_<0.5>) by carbon addition. Ll_2 (Fe_3GaC_<0.05> or Fe_3Ga) is known for decreasing magnetostriction. The purpose of this study is to enhance the alloy which has equal amount of magnetostriction of Galfenol alloy (>100ppm)) and mechanical strength over 600MPa. Therefore we thought it is necessity to restrain the dramatic decrease of the A2 phase (aFe-(Ga,Al)) which has large magnetostriction effect. In this study, we developed the alloy which restrain the generation of Ll_2 phase by the addition of small amounts of carbon (C = 0.0, 0.5, 1.0 at.%), and investigated influence on magnetostriction and mechanical strength by the addition of small amounts of carbon.
2009-09-12