The microstructure and mechanical properties of as-cast Mg

97

Ni

1

Gd

1

Nd

1

alloy were investigated using optical microscope（OM）

X-ray diffraction（XRD）

scanning electron microscope（SEM）and mechanical tests.The microstructure of as-cast Mg

97

Ni

1

Gd

1

Nd

1

alloy is mainly composed ofα-Mg dendrites and interdendritic long period stacking ordered（LPSO）phases.The tensile yield strength

ultimate strength and elongation of the alloy reach 139 MPa

163 MPa and 1.7%

and 131 MPa

192 MPa and6.7%

at room temperature and at 300℃

respectively

showing an anomalous positive temperature dependence of the strength.The compressive yield strength

ultimate strength and plasticity of the alloy reach 159 MPa

364MPa and 14.9%

respectively

at room temperature

indicating a tension-compression asymmetry for as-cast Mg

97

Ni

1

Gd

1

Nd

1

alloy.