Journal
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
Volume 75, Issue 3, Pages 827-832Publisher
SPRINGER INDIA
DOI: 10.1007/s12666-021-02503-3
Keywords
Cr-rich metallic glass; Isothermal crystallization kinetics; Avrami exponent; Activation energy
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Funding
- State Key Laboratory of Metastable Materials Science and Technology [202108]
- Natural Science Basic Research Program of Shaanxi [2020JQ-811]
- National Natural Science Foundation of China [51904218, 51971166]
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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.
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.
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