Preparation method of Nd-Fe-Co-Al bulk metallic glass

The invention provides a preparation method of Nd-Fe-Co-Al bulk metallic glass. The preparation method is characterized in that alloy is put in a sealed quartz tube, B2O3 is adopted as an alloy scavenging agent, and the alloy is quenched in an ice-water mixture during continuous vacuum-pumping so as to prepare Nd60+X-Y-ZFe30-XCoYAl10+Z bulk metallic glass, wherein X is greater than or equal to 0 and less than or equal to 30, Z is greater than or equal to 0 and less than or equal to 20, 60+X-Y-Z is greater than or equal to 50, and X, Y and Z are all atomic percent. The preparation method provided by the invention has the unique advantages as follows: firstly, B2O3 is put in the alloy and can absorb oxide of each element during melting to scavenge the alloy to prevent the alloy from crystallization of heterogeneous nucleation and improve the glass forming capability of the alloy; secondly, as continuous vacuum-pumping is performed in the process, inherent air holes of the alloy or air holes formed in the alloy during melting can be eliminated; and lastly, the strength of magnetic performance of the glass is controlled through regulation or control of the cooling rate.