Trial magnesium low pressure permanent mold cradles demonstrated good mold fi lling and casting fl uidity.
fect detected was clustered shrinkage porosity (Fig. 3). Oxide fi lm defects also were found on the squeeze and low pressure permanent mold samples. These control arms had a fi lm-like structure with a folded and wrinkled appearance in the fracture surfaces. The T-Mag and ablation samples contained small gas poros- ity, but no apparent defects or oxide fi lms were detected. The Weibull moduli for ultimate
bending strength were 7.93, 11.54 and 17.29 for squeeze, low pressure permanent mold and T-Mag. Mean values were 295.8 MPa (squeeze cast), 334.93 MPa (low pressure permanent mold) and 352.84 MPa (T-Mag) (Table 3). An average UBS level of 536.35 MPa
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was reached on the ablation samples before the four-point bend test hit its limit. These results indicate the T- Mag and ablation castings have better mechanical properties than squeeze cast and low pressure permanent mold castings.
METAL
This B206 aluminum swing arm was cast via the ablation process and featured 2.5- mm thick walls and isolated, unfed bosses.
JULY/AUGUST 2011 METAL CASTING DESIGN AND PURCHASING 33
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