To obtain high strength for near-rapid solidification (NRS)
magnesium allo
ys, the microstructures and mechanical properties of the Mg
94Zn
2.4Y
3.6 (at%) allo
ys, which were prepared b
y ordinar
y and injection copper mold casting (ICMC), respectivel
y, were investigated comprehensivel
y. It has been shown that the microstructure of ICMC Mg
94Zn
2.4Y
3.6 allo
y possesses the far-awa
y-from equilibrium feature of NRS
materials, which is composed of refined α-Mg grains with supersaturated Y and Zn, fine network-like long-period stacking-order (LPSO) phases and a few of Mg
24Y
5 particles. The interface between LPSO phase and α-Mg
matrix is semi-coherent with the orientation relationship of [0002]
α//[11
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LPSO, (10
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α//(0002
)LPSO. The ICMC allo
y exhibits enhanced mechanical properties with the ulti
mate tensile strength and elongation up to 355 MPa and 7% at room temperature, respectivel
y, and with the ulti
mate tensile strength of 302 MPa at 150 °C. It can be concluded that the strengthening mechanisms of this ICMC allo
y are attributed to the grain refinement, the solid solution effect, the secondar
y phase strengthening and the cr
ystalline boundaries strengthening.