Research Article
Microstructural Characterization of Beryllium Treated Al-Si Alloys
Table 2
Silicon particle measurements for the as-cast 357 alloy samples (obtained from graphite mold castings, DAS 65 μm).
| | Alloy (condition) | Area (µm2) | Length (µm) | Roundness ratio (%) | Aspect ratio | | Av. | SD | Av. | SD | Av. | SD | Av. | SD |
| | A1 (nonmod.) | 76.70 | 71.50 | 21.60 | 16.30 | 28.4 | 21.8 | 3.52 | 4.54 | | C3 (nonmod.) | 20.70 | 22.70 | 9.63 | 7.98 | 36.2 | 21.4 | 2.86 | 5.84 | | A1B (Be mod.) | 49.60 | 52.40 | 15.20 | 12.00 | 33.8 | 21.8 | 2.85 | 3.45 | | C3B (Be mod.) | 13.60 | 14.30 | 6.75 | 5.08 | 43.7 | 22.2 | 2.27 | 1.15 | | A1S (Sr mod.) | 3.18 | 3.21 | 3.05 | 2.16 | 46.0 | 19.2 | 2.11 | 2.14 | | C3S (Sr mod.) | 4.48 | 4.78 | 3.82 | 3.07 | 43.4 | 21.5 | 2.46 | 3.87 | | A1BS (Be + Sr mod.) | 2.75 | 2.94 | 3.00 | 2.38 | 43.5 | 19.5 | 2.18 | 2.25 | | C3BS (Be + Sr mod.) | 3.38 | 3.97 | 3.27 | 2.69 | 43.9 | 19.8 | 2.15 | 1.32 |
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