Evolution of temperature gradients during rolling of $Cu_{54}Ni_6Zr_{22}Ti_{18}$ bulk metallic glass in the super cooled liquid region

Cu기 비정질 합금의 과냉각 액상구간에서 온간 압연시 Roll 온도의 영향

Bulk metallic glass (BMG) strips of $Cu_{54}Ni_6Zr_{22}Ti_{18}$ were produced by warm rolling of the amorphous powder canned with copper. Controlling of temperatures of the rolled sample and rolls was essential for the successive rolling process. Because improper controlling of the sample temperature gave rise to the crystallization of BMG loading to the catastrophic fracture of BMG strips, the temperature of rolls should be properly controlled for achieving successful powder rolling of BMG. The variations of the strain state and temperature in the roll gap was simulated by the finite element method(FEM) using various roll temperatures.