Al-Si合金鋳物の疲労き裂伝ぱ特性
1987 年 37 巻 12 号 p. 824-830
詳細
1987 年 37 巻 12 号 p. 824-830
Permanent mold castings of high purity binary Al-Si alloys (Si: 3, 7, 12 and 20%) were tested. The fatigue crack propagation in as-cast alloys in the Paris regime is seriously influenced by Si concentration less than eutectic composition. Al-20%Si alloy is less stable in fatigue crack propagation than the other alloys. Solution treated high Si alloys show slower rates of fatigue crack propagation than as-cast alloys. The fact depends on strengthening of the matrix, forming of eutectic Si particles into spheres and on increase in crack closure. The resistance to fatigue crack initiation is improved by high content of Si in as-cast alloys and by solution treating.
