Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 32, Issue 3, Pages 525-532Publisher
MINERALS METALS MATERIALS SOC
DOI: 10.1007/s11661-001-0069-y
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Four common AlSiMg foundry alloys have been solution heat treated at 813 K, quenched, and immediately aged at 423 K for up to 240 minutes. The mechanical properties are found to be related to the amount of Mg and Si in the alloys. A high strength is obtained after only 60 minutes of solution heat treatment, indicating that the solid solution is rapidly saturated on ME and Si. The ductility is very much related to the amount of silicon present and the refinement of the silicon crystals within the eutectic areas, since silicon crystals are observed to crack when load. is applied. Thus, a well-modified structure is the best way to obtain high ductility. Reduced quenching rates after solution heat treatment lead to a lower strength, since a lower number of hardening beta'-Mg2Si precipitates are formed. The ductility of alloys with 0.6 wt pet Mg is increased with a reduced quenching rate. A more ductile matrix corresponding to the lower amount of hardening precipitates can explain this. Alloys with 0.2 wt pet Mg remain relatively unchanged. A hypothesis that may explain this phenomenon is the precipitation of brittle silicon or formation of coarse Mg2Si within the dendrites.
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