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对不同退火温度和退火时间处理的镁铝复合板进行显微组织观察、能谱分析和硬度测量。结果表明:退火处理后,复合界面上生成了新的扩散层,随着退火温度升高,结合层和扩散层的厚度增加,晶粒变大,随着退火时间的增加,结合层的厚度先上升后下降,而扩散层的厚度一直在上升,晶粒变小。扩散层厚度过大时,该区域内组成物质主要是脆硬相的金属间化合物,结合层和扩散层分别生成了Al_(12)Mg_(17)和Al_3Mg_2,复合界面成为脆性结构,复合强度反而降低。350℃下60 min退火处理为较理想的退火工艺。
The microstructure observation, energy spectrum analysis and hardness measurement of Mg-Al composite plates treated with different annealing temperature and annealing time were carried out. The results show that after the annealing process, a new diffusion layer is formed on the composite interface. With the increase of annealing temperature, the thickness of the bonding layer and diffusion layer increases and the grain size increases. With the increase of annealing time, the thickness of the bonding layer Ascended and then decreased, while the diffusion layer thickness has been rising, smaller grains. When the thickness of the diffusion layer is too large, the intermetallic compounds are mainly composed of brittle and hard phase in the region. Al 12 Mg 17 and Al 3 Mg 2 are formed in the bonding layer and the diffusion layer respectively. The composite interface becomes brittle and the composite strength is opposite reduce. Annealing at 350 ℃ for 60 min is the ideal annealing process.