中文摘要：

通过寻找共晶点成分和相似元素替代的方法开发（Ce-La）-Ni-Al系非晶合金，并采用铜模吸铸法制备出直径不小于5 mm的完全非晶态合金。利用X 射线衍射仪确定合金的结构，用差示扫描量热仪（DSC）对非晶合金的玻璃转变、晶化和熔化行为进行了研究。结果表明，La的添加极大地提高了Ce-Ni-Al三元非晶合金的玻璃形成能力和热稳定性。研究中用热力学模型解释了这种变化的原因。与Ce-Ni-Al三元非晶合金相比，物理化学性能都相似的Ce、La两个稀土元素的共存增加了体系的混乱度，导致系统熵的增加，从而降低系统能量，使合金的玻璃形成能力和热稳定性都提高

英文摘要：

（Ce-La）-Ni-Al bulk amorphous alloys were developed by seeking the eutectic composition and similar element substitution. A series of completely amorphous alloy rods （≥5 mm in diameter） were prepared by casting the melt ingots into a water-cooled copper mould under vacuum. The structures of the alloy samples were determined by X-ray diffraction. The behaviors of glass transition, crystallization and melting were studied by differential scanning calorimetry （DSC）. Results show that La addition greatly improves the glass-forming ability （GFA） and thermal stability of Ce-Ni-Al amorphous alloy. The reasons for this change were explained by a thermodynamic model. Compared with Ce-Ni-Al amorphous alloys, the coexistence of Ce and La, which have similar physical and chemical properties, increases the confusion degree and the entropy of the corresponding alloys; consequently it decreases the Gibbs free energy and thus increases the GFA and thermal stability of the alloys