The Effect Of Rare Earth Elements On The Formation Ability Of Aluminum-based Multiple Amorphous Alloys By Subregular Model

Al-based rare earth amorphous alloy,as a kind of new aluminum alloy with excellent performance and good prospect,has an irreplaceable position in the field of civil and national.At present,the related preparation methods and properties of Al-based rare earth amorphous alloys have not been well studied,and the exploitation of a new type of Al-based rare earth amorphous alloy materials relies mainly on experience.But there are more than one element of rare earth and the corresponding system is relatively complex,which will not only result in the difficulty of the development of the new materials,but also consume a lot of time and cost.Therefore,it is of great theoretical significance and application value to predict the amorphous alloy ability of Al-based rare earth amorphous alloys theoretically.In this paper,a subregular model,based on the Miedema theory,is developed to calculate the formation enthalpy and to predict the amorphous forming ranges of the multicomponent alloys system.The subregular model has been used to calculate the formation enthalpy and to predict the amorphous forming ability of Al-RE binary alloy,Al-Ni-RE ternary and multicomponent alloy.Through the systematic research,the following conclusions are obtained:1.Both the Al-RE binary alloy and amorphous formation enthalpy are less than0;meanwhile the latter is smaller than the formation enthalpy of the same component.From this point,Rare earth is more likely to form amorphous alloys.2.The parameters b and c of fitting curves which can be used to describe the relation of Al-RE binary alloy crystal and amorphous formation enthalpy and rare earth composition are related to the effective volume V and charge density n of rare earth elements.3.By applying the subregular model to calculate the amorphous formation enthalpy of Al-Ni-RE ternary alloy full composition range,found that the experimental results all fall within the scope of the calculation result,and the experimental data are concentrated in Al rich area.4.In the Al-Ni-RE system alloys,when the Al content is 70%,80% and 86%,the crystalline and amorphous formation enthalpy decrease with the increase of the RE content.