The effect of Ti or Ti-B on grain size and mechanical properties of Al-7%Si-0.3%Mg casting alloy

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  • Ａｌ‐７％Ｓｉ‐０．３％Ｍｇ合金の結晶粒の微細化と機械的性質に及ぼすＴｉまたはＴｉ‐Ｂ添加の影響について
  • Al 7パーセント Si 0 3パーセント Mg ゴウキン ノ ケッショウリュ

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Abstract

The alloys to which different concentrations of Ti or Ti-B had been introduced were cast in the JIS permanent mold and an insulating mold. Additions of Ti or Ti-B0.04% or more and 0.08% or more lead to respectively micro-grain refining and macro-grain refining in the alloy solidified at a same cooling rate. The cooling rate particularly at an early stage of solidification is more important than the Ti or Ti-B addition to govern the grain size and the mechanical properties particularly eleongation and ultimate strength. The grain refining effect is maintained during melting for 3hrs., and that of Ti-B for 7hrs. The grain refining effect of Ti disappears in remelting, and that of Ti-B remains in second remelting.

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