AZ31Bマグネシウム合金セミソリッドスラリーを用いて連続銹造した薄板の加工特性

摘要

セミソリッド铸造は固液共存状態のスラリーを作製することが最初の工程である.セミソリッドスラリーを得る技術は，これまでに機械的攪拌法，電磁攪拌法，および地金を切削してチップ状にした原料を用いるチクソモールディング法などが考案されている.いずれの方法においてもスラリー中には微細粒状結晶を有することが特長である.しかし，攪拌工程によるコストの増加や製品サイズが制限される等の問題がある.%We produced AZ31B magnesium alloy sheet by our semisolid casting method to cast slurry produced using an inclined cooling plate into the twin-roll. In this paper, the sheet obtained by this process was examined for texture, roll workability and continuously cast sheet exhibits fine grains of primary Mg-crystals. A (0001) pole figure of the continuously cast sheet confirms that the crystal direction was random and there was little rolling anisotropy. Influence of different heating temperatures on accumulative rolling reduction of the twin-roll cast sheet was not appeared by different roll directions versus the casting direction. The accumulative rolling reduction of the twin-roll cast sheet is higher than chill cast sheet in case of heating temperature of 473 K or less. The Erichsen test indicated excellent value.