系统研究了铝基非晶态合金Al-Co-Y体系中富Al区的非晶形成能力。形成非晶结构最佳成分为Al88Co5Y7，条带临界厚度为230 μm。此体系的玻璃形成能力对合金成分十分敏感。具有高的玻璃形成能力的合金未呈现出明显的玻璃转变特征。相对Trg 和 ΔTx 判据，“相选择”理论在寻找最佳合金成分和表征玻璃形成能力与成分的关系中更为有效。在非晶相的形成过程中，其主要竞争相为fcc-Al，Al3Y和 Al9Co2相。
Al85Ni5Y8Co2 has the highest glass forming ability in Al-based amorphous alloys to date. To locate the optimum composition in its basic system is of great importance for preparing Al-based bulk metallic glass. Al-Co-Y system has not been studied thoroughly as yet. In this work, it is indicated that Al88Co5Y7 is the best alloy and its critical thickness is up to 230 μm. The glass forming ability shows a strong dependence on composition in this system. Surprisingly, there is no obvious glass transition phenomenon upon heating in the best glass formation alloy. Compared with Trg and ΔTx criteria, phase selection method is proved to be effective to locate the optimum alloy and characterize the glass forming ability dependence on composition in this system. It is fcc-Al, Al3Y and Al9Co2 that compete with amorphous phase during its formation.
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