Ce添加对AZ80镁合金显微组织和织构特征的影响

Effect of Ce Addition on Microstructure and Texture Characteristics of AZ80 Magnesium Alloy

利用光学显微镜、扫描电子显微镜、能谱色散谱议和电子背散射衍射技术表征并分析AZ80和AZ80-Ce镁合金铸态、均质态及挤压态的微观组织和形貌,研究Ce添加对AZ80镁合金铸态、均质态及挤压态组织和织构特征的影响。结果表明:添加稀土元素Ce后,粗大的β-Mg17Al12离异共晶组织被细化并由连续网状分布变为断续状,显微组织中有针状和棒状的Al-Ce相生成;挤压变形后,AZ80板材织构特征明显,Ce添加导致再结晶晶粒的c轴向垂直于ND-ED(ND表示板材平面法线方向,ED表示板材挤压方向的交面)平面方向转动。

Micro-structure and morphology of as-cast,homogenized and extruded AZ80 and AZ80-Ce magnesium alloys were characterized and analyzed with optical microscopy,scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and electron back-scattered diffraction(EBSD).Effects of rare-earth Ce addition on the micro-structure and texture characteristics of as-cast,homogenized and extruded AZ80 alloys were investigated.The results show that after adding the rare earth element Ce,the coarse eutectic micro-structure withβ-Mg17Al12 is refined and changes from continuous reticular distribution to intermittent,needle-like and block-like Al-Ce phases can be found in the micro-structure.After extrusion deformation,the texture characteristics of AZ80 plate are obvious,the c axis of the recrystallized grain is perpendicular to ND-ED by the addition of Ce(ND represents the normal direction of the plate plane,and ED is the intersection of the direction of the plate extrusion).