Effect of addition of Al-Si eutectic alloy on microstructure and mechanical properties of Mg-12wt%Li alloy

doi:10.1016/j.jmst.2018.03.007

Abstract

Abstract:

Mg-12Li, Mg-12Li-3(Al-Si), Mg-12Li-7(Al-Si) and Mg-12Li-9(Al-Si) alloys (all in wt%) were fabricated by high frequency vacuum induction melting in a water cooled copper crucible. After subsequently hot-rolling and annealing, their microstructure and mechanical properties were investigated. Experimental results show that mechanical properties of Mg-12Li alloy were significantly improved by the addition of Al-Si eutectic alloy. Mg-12Li-7(Al-Si) alloy shows the highest strength of 196 MPa of the investigated alloys, which is about 1.8 times of the strength of Mg-12Li alloy, and maintains high elongation of 27%. The improved mechanical property with addition of Al and Si in the eutectic proportion into Mg-12Li alloy was attributed to the solution strengthening effect of Al and precipitation hardening effect from AlLi and Mg₂Si precipitates.

Key words: Al-Si eutectic, Mg-12Li alloys, Precipitation, Strengthening, Rolling

Zilong Zhao, Xuegang Xing, Jinyu Ma, Liping Bian, Wei Liang, Yide Wang. Effect of addition of Al-Si eutectic alloy on microstructure and mechanical properties of Mg-12wt%Li alloy[J]. J. Mater. Sci. Technol., 2018, 34(9): 1564-1569.

Figures/Tables 9

Fig. 1. OM images of various as-cast Mg-Li alloys: (a) Mg-12 Li, (b) Mg-12 Li-3(Al-Si), (c) Mg-12 Li-7(Al-Si), (d) Mg-12 Li-9(Al-Si).

Fig. 2. XRD patterns of Mg-12Li alloy with different contents of Al-Si alloy addition.

Fig. 3. SEM image of as-rolled Mg-12Li alloy (a) and the EDS spectrum (b).

Fig. 4. EDS mapping of the hot-rolled alloy Mg-12Li-3(Al-Si).

Fig. 5. EDS mapping of the hot-rolled alloy Mg-12Li-7(Al-Si).

Fig. 6. TEM images of Mg-12Li-7(Al-Si), (a) Bright field (BF) image showing the spherical precipitates; (b) Selected-area diffraction pattern from the area SA red-circled in (a).

Fig. 7. EDS mapping of the hot-rolled alloy Mg-12Li-9(Al-Si).

Fig. 8. Engineering stress-strain curves of various as-rolled Mg-12Li-x(Al-Si) alloys.

Fig. 9. Crack morphology under different magnifications of Mg-12 Li-7(Al-Si) alloy.

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