作者： Chaoyue Zhao；Xianhua Chen；Fusheng Pan；Jingfeng Wang；Shangyu Gao；Teng Tua；Chunquan Liu；Jiahao Yao；Andrej Atrens； 

关键词： Mg-Zn alloy  Strain hardening  Dislocation  Basal texture 

出版日期：2019-01-15null

摘要：The influence of Zn on the strain hardening of as-extruded Mg-x Zn(x = 1, 2, 3 and 4 wt%) magnesium alloys was investigated using uniaxial tensile tests at 10~(-3)s~(-1) at room temperature. The strain hardening rate,the strain hardening exponent and the hardening capacity were obtained from true plastic stress-strain curves. There were almost no second phases in the as-extruded Mg-Zn magnesium alloys. Average grain sizes of the four as-extruded alloys were about 17.8 μm. With increasing Zn content from 1 to 4 wt%, the strain hardening rate increased from 2850 MPa to 6810 MPa at(б-б_(0.2)) = 60 MPa, the strain hardening exponent n increased from 0.160 to 0.203, and the hardening capacity, Hc increased from 1.17 to 2.34.The difference in strain hardening response of these Mg-Zn alloys might be mainly caused by weaker basal texture and more solute atoms in the α-Mg matrix with higher Zn content.

刊名：Journal of Materials Science & Technology