Modeling of Diffusion-Controlled Crystallization Kinetics in Al-Cu-Zr Metallic Glass

Metals

Martin Fisk¹  Anders Ericsson¹ 

[1] Division of Solid Mechanics, Lund University, P.O. Box 118, SE 22100 Lund, Sweden;

关键词: metallic glass;    Al-Cu-Zr;    crystallization;    CALPHAD;   

DOI  :  10.3390/met12050867

来源: DOAJ

【 摘 要 】

Crystallization is a major challenge in metallic glass production, and predictive models may aid the development of controlled microstructures. This work describes a modeling strategy of nucleation, growth and the dissolution of crystals in a multicomponent glass-forming system. The numerical model is based on classical nucleation theory in combination with a multicomponent diffusion-controlled growth model that is valid for high supersaturation. The required thermodynamic properties are obtained by coupling the model to a CALPHAD database using the Al-Cu-Zr system as a demonstrator. The crystallization of intermetallic ${\left(\mathrm{Al},\mathrm{Cu}\right)}_m{\mathrm{Zr}}_n$ phases from the undercooled liquid phase were simulated under isothermal as well as rapid heating and cooling conditions (${10}^{-1}–{10}^6{\mathrm{Ks}}^{-1}$). The obtained time–temperature transformation and continuous-heating/cooling transformation diagrams agree satisfactorily with the experimental data over a wide temperature range, thereby, demonstrating the predictability of the modeling approach. A comparison of the simulation results and experimental data is discussed.

【 授权许可】

Unknown