Abstract
The composition and structural modification of high-aluminum zinc alloys and high-zinc aluminum alloys influence their wear properties and structural stability. The work described has been aimed at improving properties of the sand-cast Al-Zn-based foundry alloys, particularly their ductility and dimensional stability, by melt inoculation and/or change of chemical composition. In a series of studies, high-aluminum Zn-(25-26) wt.% Al-(1-2.5) wt.% Cu and high-zinc Al-(27-30) wt.% Zn-(1.5-2.5) wt.% Cu alloys have been doped with different levels of added Ti and Mn. The alloys’ structure and mechanical properties have been studied using scanning electron microscopy (SEM), light microscopy (LM), dilatometry and pin-on-disk wear measurements. A small addition of Ti introduced with Zn-4Ti master alloy leads to significant grain refinement of the high-aluminum zinc alloys. A small addition of Ti introduced with Al-3Ti-0.15C master alloy leads to significant grain refinement of the high-zinc aluminum alloys. In the ternary alloys, partially replacing Cu with Ti and/or Mn allows dimensional changes to be reduced while preserving good wear properties.
Highlights
IntroductionAmong the cast alloys based on the Al-Zn system, there are high-aluminum zinc (h-Al Zn) alloys containing 15-40 wt.% Al and high-zinc aluminum (h-Zn Al) alloys containing 2040 wt.% Zn. Among the cast alloys based on the Al-Zn system, there are high-aluminum zinc (h-Al Zn) alloys containing 15-40 wt.% Al and high-zinc aluminum (h-Zn Al) alloys containing 2040 wt.% Zn
Cast alloys with Al- and Zn-based matrices show an increasing range of uses, and the world production of such castings is still increasing—Fig. 1 (Ref 1).Among the cast alloys based on the Al-Zn system, there are high-aluminum zinc (h-Al Zn) alloys containing 15-40 wt.% Al and high-zinc aluminum (h-Zn Al) alloys containing 2040 wt.% Zn
It was noted in Ref 28 and Ref 33 that the Zn3Ti phase introduced with the Zn-Ti master alloy is a very effective and stable nucleant of the a(Al) matrix of the high-aluminum zinc alloys
Summary
Among the cast alloys based on the Al-Zn system, there are high-aluminum zinc (h-Al Zn) alloys containing 15-40 wt.% Al and high-zinc aluminum (h-Zn Al) alloys containing 2040 wt.% Zn. Among the cast alloys based on the Al-Zn system, there are high-aluminum zinc (h-Al Zn) alloys containing 15-40 wt.% Al and high-zinc aluminum (h-Zn Al) alloys containing 2040 wt.% Zn These alloy types have a wide range of potential applications because of their good strength of 200-400 MPa and simultaneously good tribological and damping properties. Both alloy types usually contain 2-5 wt.% Cu which increases the strength and improves the tribological properties. These include a relatively low value of allowable operating temperature; great sensitivity to overheating of the liquid metal leading to oxidation of alloy components and resulting in decrease in
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