Microstructure and mechanical properties of Mg-Zn-Y-Nd-Zr alloys

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Abstract

The microstructure and tensile properties of the as-cast and solution treatment Mg-4.5Zn-1Y-xNd-0.5Zr (x=0, 1 wt.%, 2 wt.%, 3 wt.%) alloys were investigated. The results showed that the microstructure of Mg-4.5Zn-1Y-0.5Zr alloy consisted of α-Mg, Zn-Zr, W (Mg3Y2Zn 3) and I (Mg3YZn6) phases. With the addition of Nd, I-phase disappeared and Mg3Y2Zn3 phase changed into Mg3(Nd,Y)2Zn3 phase. When the content of Nd reached 3 wt.%, T phase, i.e., ternary Mg-Zn-Nd phase, formed. In addition, with the increase of Nd content in the alloys, the secondary dendritic arm spacing decreased, while the amount of intermetallic phases increased. For as-cast Mg-4.5Zn-1Y-xNd-0.5Zr alloys, after solution treatment, microsegregation was eliminated and the shape of eutectic structure of α-Mg+W transformed from lamellar into spherical. The tensile strength and elongation of Mg-4.5Zn-1Y-3Nd-0.5Zr alloy were increased from 219.2 MPa and 11.0% to 247.5 MPa and 20.0%, respectively.

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Wang, J., Liu, R., Dong, X., & Yang, Y. (2013). Microstructure and mechanical properties of Mg-Zn-Y-Nd-Zr alloys. Journal of Rare Earths, 31(6), 616–621. https://doi.org/10.1016/S1002-0721(12)60330-5

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