Internal stresses induced by plastic shear deformation of Zr–(Cu,Ag)–Al bulk metallic glasses

• Published in: Journal of non-crystalline solids 2012-01, Vol.358 (2), p.220-223
• Main Authors: Afonin, G.V., Khonik, S.V., Konchakov, R.A., Kobelev, N.P., Kaloyan, A.A., Khonik, V.A.
• Format: Article
• Language: English
• Subjects: Amorphous materials; Deformation mechanisms; Internal stresses; Melts; Metallic glasses; Residual stress; Shear stress; Stress relaxation; Structural relaxation; Zirconium base alloys
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2011.09.016

Effective internal shear stress σi induced by torsional deformation of Zr46(Cu4/5Ag1/5)46Al8 and Zr46Cu46Al8 bulk metallic glasses different by the glass-forming ability of the maternal melts has been determined by measurements of stress relaxation upon stepwise unloading. It has been found that the ratio σi/σ0 (σ0 is the initially applied shear stress) decreases upon increasing the temperature from ≈0.8 at T=450K (T≈0.64×Tg) to ≈0.08 at T=638K (T≈0.91×Tg) independently of σ0 and glass composition. The obtained result is in good agreement with earlier data obtained on ribbon metallic glasses. The origin of deformation-induced internal stresses and their connection with deformation mechanisms of metallic glasses has been briefly discussed. ► Deformation-induced internal stress σi in Zr–Cu–Al–Ag glasses has been determined. ► σi equals to a certain part of the applied stress, which decreases with T. ► Strong change of the production melt quenching rate does not alter σi.