Abstract
The effect of various Sn contents (1–2 wt. %) on the microstructure, age hardening response, and tensile and casting properties of the high-pressure die cast Mg-6Zn-4Al alloy were studied. All as-cast alloys consisted of α-Mg and icosahedral quasi-crystalline phase; and the addition of 2% Sn caused the formation of Mg2Sn phases. Dendrite structure and eutectic phases were observably refined by Sn addition. The hot tearing susceptibility of the die cast Mg-6Zn-4Al alloy prominently decreased with increasing Sn addition. During T6 heat treatment, Sn addition did not obviously affect the time to reach peak hardness, but significantly enhanced the age hardening response and improved the strength of alloys under peak-aged conditions. Compared to single aging, double aging resulted in the higher density of finer β1′ and β2′ precipitates. The double aged Mg-6Zn-4Al-1Sn alloy offered the optimum tensile properties among all conditions. The yield strength, ultimate tensile strength, and elongation were 209 MPa, 305 MPa, and 4.3%, respectively.
Highlights
In the past decades, magnesium alloys have been commonly used in automobile, aviation, and electronics industries owing to their excellent strength-to-weight ratios, good castability, and high specific stiffness [1,2]
It was reported that addition of rare earth (RE) to ZA alloys caused new RE-containing phases to form and microstructures were refined, which lead to the improvement of the mechanical properties of ZA alloys [8,9]
A previous study has pointed out that ZA64 alloys are prone to hot tearing during die casting
Summary
Magnesium alloys have been commonly used in automobile, aviation, and electronics industries owing to their excellent strength-to-weight ratios, good castability, and high specific stiffness [1,2]. Sn addition to ZA alloys get more concern, because it can achieve high strength at room and elevated temperature with low cost [12]. Some Mg-Zn-Al alloys are susceptible to hot tearing during solidification, which limited to be suitable for heat treatment to obtain high strength. Magnesium alloy, fluidity increased and hot tearing susceptibility (HTS) decreased [19]. The present study chooses Mg-6Zn-4Al as the base alloy owing to its moderate castability limited their applications in casting components [18]. The HTS, microstructure, and tensile properties of could improve castability of Mg alloys [13,19]. To explore the AZ91 magnesium alloy, increased hot tearing susceptibility (HTS) decreased effect of Sn addition and understanding the strengthening mechanism of. Of Sn addition and understanding the strengthening mechanism of T6-treated Mg-6Zn-4Al alloy
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