Effects of Short Time Solution Treatment at High Temperature Using Induction Heating Apparatus on Mechanical Properties in JIS AC4CH Alloys

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  • Saruwatari Naohiro
    Department of Education Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • Nakayama Yoshihiro
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • Sekiya Eiji
    YS Electronics Co., Ltd.

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Other Title
  • 誘導加熱装置による高温短時間溶体化処理がAC4CH合金の機械的性質に及ぼす影響
  • ユウドウ カネツ ソウチ ニ ヨル コウオン タンジカン ヨウタイカ ショリ ガ AC4CH ゴウキン ノ キカイテキ セイシツ ニ オヨボス エイキョウ

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Abstract

<p>  The effects of microstructure changes by short time solution treatment at high temperatures using a high-frequency induction heating apparatus on mechanical properties in an AC4CH aluminum alloy were investigated. In the sample solution treated at 560℃ for 3min with heating rate of 40℃/s, Vickers hardness in the primary α-aluminum phases and 0.2% proof stress increased by 21% and by 23% respectively as compared with those of the as-cast condition. The increase in hardness and proof stress was in good agreement with Mg and Si concentrations in the primary α-aluminum phases. These mutual relationships suggest that the solid solution hardening is acting effectively. In addition, it is also suggested that formation of the cluster during natural aging has a small influence. For samples which were solution-treated at 560℃ for 3min or more, the work hardening exponent (n value) increased with the increase in strain during the tensile test. The increase in the n value is thought to be due to the change in the dislocation structure caused by the solution of Mg and Si atoms into the α-aluminum phases. Distributions of eutectic Si particles and dimples in the fracture surface suggest that the slight increase of fracture elongation for solution treated at 560℃ beyond 3min was caused by the increase of inter particle distance between the eutectic Si particles. </p>

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