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Mechanical behavior of bulk ultra-fine-grained Zn–Al die-casting alloys

✍ Scribed by J.M. Gobien; R.O. Scattergood; F.E. Goodwin; C.C. Koch

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
831 KB
Volume
518
Category
Article
ISSN
0921-5093

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✦ Synopsis

The mechanical properties of Zn-4 wt% Al casting alloys are compared after various processing methods including sand casting, die-casting, and high energy cryogenic ball milling. For the cast structures there is an increase in strength when transitioning from a coarse sand casting microstructure to a finer grained thin-section die-casting. This is in contrast to a decrease in strength and increase in ductility seen when the cast structure is broken up by high energy cryogenic ball milling to a uniform ultra-fine grain scale. The ultra-fine grained structures produced by cryogenic ball milling subjected to a range of isothermal heat treatments follow the Hall-Petch behavior over the range of grain sizes studied.

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