Investigation on the mechanically-induced nanocrystallization in metallic glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:859

Article

Ammari, C.²  Yousfi, M. A.^1,2  Hajlaoui, K.^2,3  Georgarakis, K.⁴ 

[1] King Khalid Univ, Dept Mech Engn, Coll Engn, Abha, Saudi Arabia

[2] Univ Sousse, ENISo, Lab Mech Sousse LMS, Sousse, Tunisia

[3] Al Imam Mohammad Ibn Saud Islamic Univ IMSIU, POB 5701, Riyadh 11432, Saudi Arabia

[4] Cranfield Univ, Sch Aerosp Transport & Mfg, Cranfield MK43 0AL, Beds, England

关键词: Metallic glass;    Deformation-induced nanocrystallization;    Crystal volume fraction;    Free volume;    Activation energy;   

DOI  :  10.1016/j.jallcom.2020.157864

来源: Elsevier

【 摘 要 】

Shear-induced nanocrystallization in bent ribbons of Pd40Cu30Ni10P20 metallic glass has been quantitatively investigated via synchrotron radiation. The formed nanocrystals volume fraction during deformation has been directly estimated from X-ray diffraction spectra using peaks area integration. The nanocrystallization process during deformation was found to be strongly linked with the microstructure configuration of shear bands in amorphous alloys. A constitutive model based on free volume approach has been introduced to describe the kinetic of mechanically induced nanocrystallization. The solution of the coupled constitutive equations of the model, fitted to experimental data, permits to determine the physical and mechanical parameters governing the phenomena of shear-induced crystallization in metallic glasses. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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