Abstract
Approaches of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction, electron backscattered diffraction (EBSD), transmission electron microscopy (TEM) and mechanical property testing have been used to study the microstructure and mechanical properties of Mg-6.1Zn-0.7Zr alloys before and after equal channel angular pressing (ECAP) investigated in detail using. The study demonstrates that the microstructure comprises of fine-grained equiaxed dynamic recrystallization. The size of various grains is in the range 2.3-5.2 μm along the boundaries of unrecrystallized grains after 6 passes of ECAP. Meanwhile, the Mg-Zn and Mg-Zn-Zr compounds gradually crush into fine dispersed particles and the dislocation density increases. With increase of pass the average (0001)<11-20> basal slip Schmid factor gradually increases to 0.41. The strength and ductility have improved with increasing of ECAP pass. Notably, after 6 passes, due to decrease of grain size and the strengthening effects of fragmentized secondary phase particles, the ultimate tensile strength increases to 260 MPa, and the elongation at break exceeds 28.6%.
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