摘要
As-extruded Mg-6Zn(wt.%)Alloy was subjected to severe plastic deformation(SPD)by the equal-channel angular pressing(ECAP)at 160 ℃.The results of tensile tests at room temperature showed that two passes ECAP resulted in a remarkable improvement of strength,yield strength from 200 to 265 MPa and ultimate tensile strength from 260 to 340 MPa.However,with the deformation increasing,the samples processed by ECAP for four or six passes had insignificant difference than that processed by two-pass ECAP.Massive precipitates were observed in all the Mg-6Zn alloys specimens processed by ECAP.Transmission electron microscope and X-ray diffraction results indicated that ECAP treatment induced the precipitation of laves MgZn_(2) phase and transition Mg_(4)Zn_(7) phase.The spherical MgZn_(2) particles and irregular shape Mg_(4)Zn_(7) particles coexist in the microstructure of Mg-6Zn alloy after six pass ECAP.
基金
support from The national natural science foundation of China(Grant No.51301151)
Jiangsu province natural science foundation of China(Grant No.BK20130447).
