Isothermal Crystallization Kinetics of Cr-Rich Metallic Glass Cr29.4Fe29.4Mo14.7C14.7B9.8Y2 with Promising Properties

In the present paper, the isothermal crystallization kinetics for Cr-rich metallic glass (MG) Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 with promising properties was investigated by approaches of Johnson–Mehl–Avrami (JMA) and Arrhenius using differential scanning calorimeter. Both the Avrami exponent ( n ) and local Avrami exponent ( n ( x )) deduced through JMA approach for all crystallization temperatures are lower than 2.5, indicating a crystallization mechanism of growth of crystal with reducing nucleation rate. Meanwhile, the n gradually decreases from about 2.0 to a value lower than 2.0 with the elevating crystallization temperature. Additionally, the n ( x ) firstly increases and then gradually decreases at low isothermal crystallization temperature, and the n ( x ) gradually decreases along with changeable crystallization mechanisms at high crystallization temperature. Furthermore, the local activation energy estimated from Arrhenius approach gradually increases from about 516 kJ mol −1 to 546 kJ mol −1 during the crystallization process. Moreover, the precipitated phases for isothermally crystallized MG are determined as (Fe,Cr) 23 (C,B) 6 and (Cr 2.5 Fe 4.3 Mo 0.1 )C 3 .