Al-Ni-Y纳米非晶复合材料的制备及显微组织

Formation and microstructure of nanocrystal-amorphous Al-Ni-Y composite

利用 X射线衍射及透射电镜对单辊旋淬法制备的具有良好韧性的 A l-Ni-Y合金条带进行了研究 ,结果表明 ,合金成分不同 ,其组织结构也不同。当快凝 Al95Ni3Y2 合金时 ,快凝组织为完全晶态相 ;当快凝 Al91 Ni7Y2 合金时 ,可形成由部分非晶和部分晶体组成的复合材料 ,此材料结构为 :纳米级 Al晶体均匀弥散分布在非晶基体上 ;随 Y和 Ni元素含量的增加 ,快凝显微组织为完全非晶结构。

Al Ni Y alloy ribbon produced by melt spinning has a good bending ductility. In this paper,the ribbon is investigated by X ray diffraction and transmission electron microscopy.The results obtained show that its structure varies with its composition. The microstructure of the as melt spun Al 95 Ni 3Y 2 alloy is a fully crystalline phase. Rapid solidification of Al 91 Ni 7Y 2 alloy can result in the formation of a composite consisting of part of amorphous crystals and part of crystals.In the composite structure,Al nanocrystals are distributed uniformly in amorphous matrix.As the content of Y and Ni increases, the as melt spun microstructure consists of a fully amorphous structure