中文摘要：

用甩带快冷技术制备Mg70（Ni3La）30和Mg70（Ni3.5La）30的非晶合金薄带（宽5 mm,厚0.2 mm）,采用X线衍射（XRD）和差示扫描量热技术（DSC）对非晶合金的结构和非晶形成能力进行研究;以2种合金的DSC曲线为基础,利用Kissinger方法、Lasocka关系以及原子团族模型等对合金的非晶形成动力学性质进行分析、探讨。研究结果表明：La含量直接影响合金负混合热,对合金的动力学具有重要影响;晶化起始温度Tx的表观激活能和频率因子越小,玻璃转变处Lasocka关系的斜率B越大,则对应Mg-Ni-La体系合金的玻璃形成能力越强,原子结构参数λ对Mg-Ni-La合金非晶形成能力的成分点设计具有很好的指导作用。

英文摘要：

Mg70（Ni3La）30 and Mg70（Ni3.5La）30（5 mm wide,0.2 mm thick） alloys were prepared by rapid solidification,using a melt-spinning technique.XRD and DSC analysis was employed to measure microstructure and glass-forming stability.Based on DSC results,glass-forming kinetic properties of samples were investigated by Kissinger method,Lasocaka curves and atomic cluster model,respectively.The results indicate that La content has an important role in glass-forming ability（GFA） and kinetic properties of Mg-Ni-La amorphous alloys.The smaller activation energy and frequency factor（Tx）,the bigger value of B（glass-transition point in Lasocka curves）,then higher glass-forming ability of Mg-Ni-La alloys would be followed.Atomic structure parameter（λ,deduced from atomic cluster model） is valuable in the design of Mg-Ni-La alloy with good glass-forming ability.