To recycle of turning chips of magnesium alloy, powder mixtures, which zinc and aluminum powder was added with various contents to turning chips of AZ31B alloy, were carried out mechanical alloying (MA) for various milling times. When Mg-30mol%Al-30mol%Zn powder mixtures were mechanically alloyed for 54ks, an i-icosahedron Mg_<49>(AlZn)_<32> phase, as called the quasi-crystal, forms and Vickers hardness of the powder particle is about Hv=300. Moreover, Mg_<17>Al_<12> or Mg_2Zn_2 phases also forms together with Mg_<49>(AlZn)_<32> phase in the case of high aluminum and zinc contents. Obtained MA powder was mixed to AZ30B alloy chips with various contents and then extruded at various temperatures. Mechanical properties and structural change in the extruded alloy are investigated.
