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利用光学金相显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)以及能谱(EDS)对不同Y含量的ZMT614-x Y(x=0,0.1,0.5,1.0)合金挤压态和时效态的微观组织和加工硬化行为进行了研究。结果表明:ZMT614-x Y(x=0,0.1,0.5,1.0)合金挤压态和时效态的晶粒尺寸随着Y含量的增加而减小。当Y质量分数达到1%时,出现新的不规则块状Mg Sn Y相。通过ZMT614-x Y(x=0,0.1,0.5,1.0)合金挤压态和时效态的真应力-应变曲线得到加工硬化率(θ)和加工硬化指数(n)。由于晶粒细化,合金挤压态和时效态的加工硬化率θ随着Y含量的增加而减小。在合金的塑性变形过程中,发生位错的动态回复,合金挤压态和时效态的加工硬化率θ随着变形量的增加而减小。
ZMT614-xY (x = 0,0.1,0.5,1.0) alloys with different Y content were extruded by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) State and aging microstructure and work hardening behavior were studied. The results show that the grain size of ZMT614-xY (x = 0,0.1,0.5,1.0) alloy decreases with the increase of Y content. When the Y mass fraction reaches 1%, a new irregular massive Mg Sn Y phase appears. The work hardening rate (θ) and work hardening index (n) are obtained from the true stress-strain curves of the as-extruded and aged ZMT614-x Y (x = 0, 0.1, 0.5, 1.0) alloys. Due to the grain refinement, the work hardening rate θ of the alloy extruded state and the aging state decreases as the Y content increases. During the plastic deformation of the alloy, the dynamic recovery of dislocation occurs, and the work hardening rate θ of the alloy extruded state and aging state decreases with the increase of the deformation amount.