The microstructure and tensile behaviors of ZE10 magnesium alloy prepared through equal channel angular pressing （ECAP） by Bc route in the die with a intersecting angle of 120° between channels were investigated.Results indicated that

the grains were refined effectively by increasing the process passes.The initial process passes brought about an unhomogeneous grain structure including fine grains of 1

5

μm and coarse grains of about 20 μm.When the process passes were up to 8

the alloy’s microstructure became visibly uniform with fine grains of 1

2

μm.After 12 passes

the alloy acquired uniform equiaxed grains structure with the grain size of 0.5

1

μm.The mechanical properties were improved effectively with the increasing of pressing passes and the total strain.