To obtain high strength for near-rapid solidification (NRS)
magnesiu
m 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 co
mprehensivel
y. It has been shown that the
microstructure of ICMC Mg
94Zn
2.4Y
3.6 allo
y possesses the far-awa
y-fro
m equilibriu
m feature of NRS
materials, which is co
mposed 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 se
mi-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 roo
m te
mperature, respectivel
y, and with the ulti
mate tensile strength of 302 MPa at 150 °C. It can be concluded that the strengthening
mechanis
ms of this ICMC allo
y are attributed to the grain refine
ment, the solid solution effect, the secondar
y phase strengthening and the cr
ystalline boundaries strengthening.