Effect of annealing time on microstructure and damping properties of rolled Mg-Al-Ca-Mn-Zn magnesium alloy
Effect of annealing time(0-3 h)on microstructure,mechanical properties and damping properties of Mg-1.2Al-0.4Ca-0.3Mn-0.3Zn magnesium alloy sheets after high strain and single pass rolling was studied by means of optical microscope(OM),dynamic mechanical thermal analysis,X-ray diffraction(XRD),tensile testing machine and scanning electron microscopy(SEM).The results show that as the annealing time increases,the grain size of the alloy gradually increases,and the tensile strength gradually decreases,from 247 MPa after annealing for 0 h to 227 MPa after annealing for 3 h.The elongation of the alloy after annealing treatment increases compared to the rolled state,with the highest elongation of 23.4％after annealing for 2 h.At the low strain amplitude stage,the annealing time has little effect on the damping properties of the alloy,at the high strain amplitude stage,the damping properties significantly improve with the increase of the annealing time.
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