快速凝固AlMnSi薄膜的热稳定性与微观结构表征

Thermal Stability and Microstructure of Rapidly Solidified AlMnSi Foils

用快速凝固技术制备AlMn、AlMnSi薄膜,分别用示差扫描量热法、透射电子显微镜、X射线衍射仪等检测技术对薄膜的相变温度、显微结构和相组成进行表征。研究结果表明:添加Si可以提高AlMn薄膜的热稳定性,本试验范围内薄膜的热稳定性从270℃提高至600℃以上。添加Si可以改变薄膜的相组成,AlMn薄膜的相组成主要为Al+Al6Mn;添加Si的质量分数分别为3%、5%的AlMnSi薄膜的相组成主要为Al+Al4.01MnSi0.74相,Si质量分数的增加对薄膜的相组成没有明显影响。添加Si可以改变薄膜的显微组织,使未加Si时出现的棒状、块状、花瓣状等多种形态的化合物转变为单一的球状化合物,并且合适的Si、Mn配比使晶粒得到细化。

The AlMn and AlMnSi foils were fabricated by rapid solidification technology.The microstructures of the foils with various Si content were studied by transmission electron microscope(TEM).The phases of the foils were indentified by X-ray diffractometer(XRD).The phase transformation temperatures of the foils were measured by differential scanning calorimeter(DSC).The results showed that addition of Si in the AlMn foil can improve the thermal stability(phase transformation temperature) from 270 ℃ to over 600 ℃.The addition of Si can change the phase structure of the foils.The phases of AlMn foil consist of Al and Al 6 Mn.The phases of AlMnSi foils with 3% or 5%(mass fraction) Si addition consist of Al and Al 4.01 MnSi 0.74.The addition of Si can also change the microstructure morphology of the foils from the rod,block and petal-like to the homogeneous globular.With the increase of Si content,the grain sizes of the foils are refined.