Fatigue Properties and Fracture Toughness of AC4CH Aluminum Alloys Cast with Different Mold Materials

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  • 異なる鋳型に鋳込んだAC4CHアルミニウム合金鋳物の疲労特性と破壊じん性
  • コトナル イガタ ニ イコンダ AC4CH アルミニウム ゴウキン イモノ ノ

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  AC4CH aluminum alloys were cast with a sand mold, a permanent mold and a permanent mold cooled by water. From each ingot, test pieces were prepared, and provided for the tensile test, the fatigue test, and the elastic-plastic fracture toughness test. The threshold stress intensity for the fatigue crack growth was independent on the cast structure and the tensile properties, and took the value of 3.0MPa·m1/2. There was no relations between the elasto-plastic fracture toughness and the stress intensity at final fatigue failure. The both increased with the increase of the grain size of a phase and eutectic Si. The elasto-plastic fracture toughness increased with the 0.2% proof stress, the ultimate tensile strength and the elongation. The stress intensity at final failure had no relations with the tensile properties, except the elongation.

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