Abstract
This paper deals with the influence of silicon phase on the wear resistance of zinc-aluminum alloy. In order to improve the wear resistance performance of ZA27 alloy under the conditions of dry friction, Si was added. It was discovered that the primary silicon phase changes from a block shape into a spheroidal one by the modification of the alloy with a compound agent containing sodium. Scanning electron microscope images (SEM) showed that the spheroidal silicon phase is a polyhedron from which needle-like eutectic silicon forms. The result of dry-friction testing indicated that this may be firmly embedded in the Zn-Al matrix and thus cannot be exfoliated during friction. The zinc-aluminum alloy reinforced by spheroidal silicon phase was found to have an increased wear resistance performance.
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