To obtain high strength for near-rapid solidifi
cation (NRS)
magnesium allo
ys, the mi
crostru
ctures and me
chani
cal properties of the Mg
94Zn
2.4Y
3.6 (at%) allo
ys, whi
ch were prepared b
y ordinar
y and inje
ction
copper mold
casting (ICMC), respe
ctivel
y, were investigated
comprehensivel
y. It has been shown that the mi
crostru
cture of ICMC Mg
94Zn
2.4Y
3.6 allo
y possesses the far-awa
y-from equilibrium feature of NRS
materials, whi
ch is
composed of refined α-Mg grains with supersaturated Y and Zn, fine network-like long-period sta
cking-order (LPSO) phases and a few of Mg
24Y
5 parti
cles. The interfa
ce 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 enhan
ced me
chani
cal properties with the ulti
mate tensile strength and elongation up to 355 MPa and 7% at room temperature, respe
ctivel
y, and with the ulti
mate tensile strength of 302 MPa at 150 °C. It
can be
con
cluded that the strengthening me
chanisms of this ICMC allo
y are attributed to the grain refinement, the solid solution effe
ct, the se
condar
y phase strengthening and the
cr
ystalline boundaries strengthening.