热处理对Mg-Gd-Y-Zr合金微观组织的影响

Effect of heat treatment on microstructure of Mg-Gd-Y-Zr alloy

对Mg-Gd-Y-Zr系合金在350℃下进行高温退火,并利用光学显微镜、扫描电镜和X射线衍射手段对退火过程中的表面氧化行为进行了系统表征。结果表明,退火过程中合金发生了显著的变化,Gd和Y元素沿初始晶界和合金表面聚集;样品发生不均匀氧化,即初始晶界的氧化速度高于晶粒内部;氧化膜主要成分为(Gd_(x),Y_(2-x))O_(3)。

Mg-Gd-Y-Zr alloy was annealed at 350℃,and the surface oxidation behavior during the annealing process was systematically characterized using optical microscope,scanning electron microscope,and X-ray diffraction.The results show that significant changes occur in the alloy during the annealing process,with Gd and Y elements aggregating along the initial grain boundaries and alloy surface.The specimen undergoes uneven oxidation,where the oxidation rate at the initial grain boundary is higher than that inside the grain.The main component of the oxide film is(Gd_(x),Y_(2-x))O_(3).