Effect of Nd and Y Addition on Microstructure and Mechanical Properties of Extruded Mg-Zn-Zr Alloy

Qiang Li; Qu Dong Wang; Da Quan Li; Wen Jiang Ding

doi:10.4028/www.scientific.net/MSF.546-549.413

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HomeMaterials Science ForumMaterials Science Forum Vols. 546-549Effect of Nd and Y Addition on Microstructure and...

Effect of Nd and Y Addition on Microstructure and Mechanical Properties of Extruded Mg-Zn-Zr Alloy

Abstract:

The effect of Nd and Y addition on the microstructure and mechanical properties of as-extruded Mg-Zn-Zr magnesium alloy has been investigated in this study. The Mg-Zn-Zr alloy had 11 μm average grain size due to dynamic recrystallization during hot extrusion; but the average grain sizes of the Mg-Zn-Nd-Y-Zr alloys were markedly reduced to 4 μm by Nd and Y additions. The lamellar α-Mg + T phase or α-Mg + W phase eutectics at grain boundaries in as-cast Mg-Zn-Nd-Y-Zr alloys were broken up and MgZn2 precipitates in the matrix are obtained during hot extrusions. The mechanical properties of as-extruded Mg-Zn-Zr alloy were improved significantly by Nd and Y additions, especially the elevated temperature strength, which was above 150 MPa in ultimate tensile strength at 250 °C. These may be ascribed to the very fine grain size, the dispersed T phase or W phase and the MgZn2 type Laves phase precipitating during hot extrusion.

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Materials Science Forum (Volumes 546-549)

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413-416

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.413

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Online since:

May 2007

Authors:

Qiang Li, Qu Dong Wang, Da Quan Li, Wen Jiang Ding

Keywords:

Extrusion, Mg-Zn-Nd-Y-Zr Alloy, Strength, T-Phase, W Phase

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