Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 824-830 |
| Number of pages | 7 |
| Journal | journal of japan institute of light metals |
| Volume | 37 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1987 |
Keywords
- Al~
- Si casting alloys fatigue cracks Paris law crack closure fatigue threshold
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry