The effects of Ni and Y contents on the microstructure and mechanical properties of Mg

100-3x

Ni

x

Y

2x

（x=0.5

1.0

1.5

2.0%）alloys reinforced with Long Period Stacking Order（LPSO）structure were analyzed.The results show that with the increase of Ni and Y contents

the primaryα-Mg grains in the alloys is refined and the volume fraction of LPSO structure is increased from 10% to 40%.Eutectic Mg

2

Ni phase exists in Mg

94

Ni

2

Y

4

alloy due to the excessive Ni element.The tensile strength of the alloys is increased with the increase of Ni and Y contents

while the elongation is decreased continuously.