Abstract
A novel method was proposed to refine the grain structure and enhance the strength of extruded AZ91 alloys by electric pulse. The grain structure was refined to the average size of 2.25 μm due to the strong athermal effects. The size of Mg17Al12 phase was greatly reduced and its distribution became much more dispersive. The strong {0 0 0 1} basal texture with c-axis parallel with normal direction appeared, and its intensity was slightly increased. The specimen extruded by electric pulse with the peak current density of 117.4 A/mm2 exhibited the highest yield strength of 221 MPa and tensile strength of 384 MPa.
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