采用真空感应熔炼制备含镁0.2%的银镁合金，冷加工成管材。 在大气环境中对合金进行内氧化处理，研究 不同氧化温度和时间的组织特征。结果表明，500℃处理后，合金组织为细小的等轴晶粒。大于700℃处理时，表面形成 一层细晶区，内部晶粒显著长大，氧化界面向中心移动。 内氧化温度小于600℃时，合金晶粒呈线性长大，趋势较平缓； 大于600℃时，晶粒快速长大。 随着温度升高，内氧化深度呈下抛物线增加。 在800℃时，随着氧化时间增加，细晶区和 内部晶粒没有明显变化，内氧化深度呈上抛物线增大。

The Ag-Mg alloy containing 0.2% Mg was prepared in vacuum induction melting and cold-machined into tube. The internal oxidation of the alloy was carried out in the atmosphere. The microstructure characteristics of different oxidation temperature and time were studied. The results show that the microstructure of Ag-Mg alloy is fine equiaxed grains after treatment at 500 ℃. When the temperature is higher than the 700 ℃, a fine-grained zone is formed on the surface. The inner grains grow up significantly, and the oxidation interface moves to the center. When the internal oxidation temperature is less than 600 ℃, the grain size of the Ag-Mg alloy grows linearly and the trend is relatively flat. When the temperature is above 600 ℃, the grains grow up rapidly. As the temperature increases, the depth of internal oxidation increases in a lower parabola. At 800 ℃, with the increase of oxidation time, the fine crystal region and internal grains is not change significantly, and the internal oxidation depth increases in a parabola.