Cyclic deformation and fatigue properties for extruded ZK60 magnesium alloy
                                                           KE Yun shu, GONG Xin hua, YANG Zeng yuan
                            (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

Abstract: Aimming at the problems of the deformation mechanism in cyclic deformation for extruded ZK60 magnesium alloy, strain controlled (the strain ratio is Rε=-1) cyclic loading experiments were carried out at room temperature obtaining stabilized stress strain hysteresis loops at half fatigue lives with strain amplitude ranging from 0.25%～5% and cyclic stress strain hysteresis loops at strain amplitudes of 4%, 1% and 0.35%, respectively. The super depth of field three dimensional microscope and the scanning electron microscope (SEM) were used to investigate the fatigue fracture, researching cyclic deformation mechanism by the analysis of macro mechanical properties and microstructure. The experimental results show that the cyclic deformation behavior for extruded ZK60 magnesium alloy can be divided into three parts. The stress strain curves and fracture morphology changed with strain amplitude obviously mainly because of the different deformation mechanism during cyclic deformation.

Key words: ZK60 magnesium alloy; cyclic deformation; fatigue; microstructure