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) Cr29.4Fe29.4Mo14.7C14.7B9.8Y2 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 (Cr2.5Fe4.3Mo0.1)C-3.

Automated summary

In this study, the isothermal crystallization kinetics of Cr-rich metallic glass were investigated, revealing a crystallization mechanism characterized by a reduction in nucleation rate. The exponent n of crystal growth gradually decreases with increasing crystallization temperature. In addition, the local activation energy during the crystallization process increases gradually. The precipitated phases for isothermally crystallized MG were determined to be (Fe,Cr)(23)(C,B)(6) and (Cr2.5Fe4.3Mo0.1)C-3.