Influence of Cu and Mg Addition on Mechanical Properties and Thermal Fatigue Life of Al-Si-Mg Cast Alloys for Cylinder Head

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  • シリンダヘッド用 Al-Si-Mg系鋳造合金の機械的性質と熱疲労寿命に及ぼす Cu，Mg添加の影響
  • シリンダヘッドヨウ Al Si Mgケイ チュウゾウ ゴウキン ノ キカイテキ セイシツ ト ネツ ヒロウ ジュミョウ ニ オヨボス Cu Mg テンカ ノ エイキョウ

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Abstract

  As an attempt to optimize materials for diesel engine cylinder heads, the chemical composition and heat treatment procedure of Al-Si-Mg alloy were studied. The relation between additional elements and mechanical properties (tensile strength and elongation) was investigated on AC4C aluminum alloys containing additional Cu or Mg, and the optimum chemical composition was determined. In composition ranges within 0.6 mass%Mg or 1.0 mass%Cu, it was found that Cu or Mg addition increased tensile strength without deterioration of elongation, and also increased high cycle fatigue strength. However, thermal fatigue tests indicated that Cu addition affected thermal fatigue life. Especially thermal fatigue life markedly decreased with increasing plastic strain. In addition, excessive aging of Cu addition alloys resulted in increased thermal fatigue life. This is because the thermal fatigue life corresponding to plastic strain increases in excessively aged alloy.

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