玻璃形成能力(GFA)是判断合金非晶态结构形成的重要指标。利用甩带快冷技术制备了Mg70(Ni3RE)30(RE=La、Ce、Pr、Nd、Y)非晶合金条带(宽5 mm,厚0.2 mm),通过差示扫描量热技术(DSC)表征了合金条带的非晶结构转变及其热稳定性。从原子尺度,对合金的原子尺寸参数(δ)、电负性差(Δx)以及原子结构参数(λ)进行了计算和分析。实验数据和理论分析结果表明:RE=Pr时,相应合金的玻璃形成能力最大,RE=Y的最小,其大小次序为:Mg70(Ni3Pr)30〉Mg70(Ni3la)30〉Mg70(Ni3Ce)30〉Mg70(Ni3Nd)30〉Mg70(Ni3Y)30,影响Mg70(Ni3RE)30非晶合金玻璃形成能力的主要因素是电负性差,原子尺寸参数和原子结构参数的作用次之。
Glass-forming ability(GFA) is an important paprameter to describ the formation of amorpus alloys.In this paper,Mg70(Ni3RE)30(RE=La,Ce,Pr,Nd,Y)(5mm wide,0.2mm thick) alloys were prepared by rapid solidification,using a melt-spinning technique.The differential scanning calorimetry(DSC) analysis were employed to measure its microstructral stability.The atomic size parameter(δ),electro-negativity difference(Δx),and the atomic structure parameter(λ,deduced from the atom cluster model) were calculated and analyzed.The results shown that GFA of Mg70(Ni3Pr)3 0(RE=Pr) is the biggest,that of Mg70(Ni3Y)3 0(RE=Y) is the smallest,and the order is Mg70(Ni3Pr)30 Mg70(Ni3la)30 Mg70(Ni3Ce)30 Mg70(Ni3Nd)30 Mg70(Ni3Y)30.Electro-negativity difference(Δx) is the key factor to GFA,the atomic size parameter(δ) and the atomic structure parameter(λ) followed.