Abstract:The as-cast microstructures and solidification behaviours of Mg-Zn-Al ternary magnesium alloys with different Zn/Al mass ratios were investigated and compared. The results indicate that, when the Zn/Al mass ratio is less than 2, the alloys are composed of a-Mg and Mg32(Al,Zn)49 phases, and with the increase of the Zn/Al mass ratio, the amount of the second phase gradually decreases and its distribution changes from continuous net to quasti-continuous net. However, when the Zn/Al mass ratio is more than 2, the … Show more
“…The formation of MgZn 2 in the alloy with no Al is consistent with the cast ZA60 magnesium alloy [18] but in contradiction to the results of Mg–6Zn–1Mn alloy with different Sn addition where Mg 7 Zn 3 was found [4], which might be the result of the different casting conditions. The formation of Mg 32 (Al,Zn) 49 in alloys containing higher Al is consistent with Mg–4.5Zn–4.5Sn–2Al alloy [19] and the phase evolution with increasing content of Al in Mg–6Zn–2Sn–0.5Mn alloy is largely consistent with Mg–Zn–Al ternary alloy, where the phase composition is determined by the amount of Zn and Al and the Zn/Al ratio [20,21]. Figure 3 XRD patterns of the as-cast Mg–6Zn–2Sn–0.5Mn alloy with different amounts of Al addition.…”
The microstructure and mechanical properties of Mg–6Zn–2Sn–0.5Mn– xAl ( x = 0, 1, 2, 3) alloy are investigated. The addition of Al leads to the refinement of grain size and the formation of Al6Mn, Mg32(Al,Zn)49 also forms when the amount of Al is higher than 2 wt-%. Because of the addition of Al, the precipitates in the alloy after ageing treatment are refined. The alloy containing 1 wt-% Al shows good mechanical properties in the as-cast state which is attributed to the refined grains and low volume fraction of large second phases, it also shows high strength after ageing treatment resulted mainly from the homogeneously distributed fine precipitates, the yield strength, ultimate tensile strength and elongation are 183, 310 MPa and 11%, respectively.
“…The formation of MgZn 2 in the alloy with no Al is consistent with the cast ZA60 magnesium alloy [18] but in contradiction to the results of Mg–6Zn–1Mn alloy with different Sn addition where Mg 7 Zn 3 was found [4], which might be the result of the different casting conditions. The formation of Mg 32 (Al,Zn) 49 in alloys containing higher Al is consistent with Mg–4.5Zn–4.5Sn–2Al alloy [19] and the phase evolution with increasing content of Al in Mg–6Zn–2Sn–0.5Mn alloy is largely consistent with Mg–Zn–Al ternary alloy, where the phase composition is determined by the amount of Zn and Al and the Zn/Al ratio [20,21]. Figure 3 XRD patterns of the as-cast Mg–6Zn–2Sn–0.5Mn alloy with different amounts of Al addition.…”
The microstructure and mechanical properties of Mg–6Zn–2Sn–0.5Mn– xAl ( x = 0, 1, 2, 3) alloy are investigated. The addition of Al leads to the refinement of grain size and the formation of Al6Mn, Mg32(Al,Zn)49 also forms when the amount of Al is higher than 2 wt-%. Because of the addition of Al, the precipitates in the alloy after ageing treatment are refined. The alloy containing 1 wt-% Al shows good mechanical properties in the as-cast state which is attributed to the refined grains and low volume fraction of large second phases, it also shows high strength after ageing treatment resulted mainly from the homogeneously distributed fine precipitates, the yield strength, ultimate tensile strength and elongation are 183, 310 MPa and 11%, respectively.
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