ZMT614-xY(x=0, 0.1, 0.5, 1.0)镁合金加工硬化行为研究

Work-Hardening Behavior of ZMT614-xY(x=0, 0.1, 0.5, 1.0) Magnesium Alloy

摘要:

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-xY (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-xY (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MgSnY相。通过ZMT614-xY (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

Abstract:

The microstructures and work-hardening behaviors of as-extruded and as-aged ZMT614-xY (x=0, 0.1, 0.5, 1.0) alloys were investigated by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and tensile test. The average grain size of as-extruded and as-aged ZMT614-xY (x=0, 0.1, 0.5, 1.0) alloys is decreased with more Y additive. A new irregular blocky MgSnY phase is formed when the content of Y reaches 1wt%. The work-hardening rate (θ) and work-hardening exponent (n) were obtained from the true stress-strain curves of as-extruded and as-aged samples. Due to the refined grains, the work-hardening rate θ of as-extruded and as-aged ZMT614-xY (x=0, 0.1, 0.5, 1.0) alloys are decreased with the content of Y increasing. Dynamic recovery of dislocations occurs during the plastic deformation, and the work-hardening rate θ of as-extruded and as-aged samples decreases as the deformation increases