Link between shear modulus and enthalpy changes of Ti16.7Zr16.7Hf16.7Cu16.7Ni16.7Be16.7 high entropy bulk metallic glass

• Published in: Journal of alloys and compounds Vol. 830; p. 154564
• Main Authors: Duan, Y.J., Qiao, J.C., Crespo, D., Goncharova, E.V., Makarov, A.S., Afonin, G.V., Khonik, V.A.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.07.2020; Elsevier BV
• Subjects: Amorphous materials; Crystal defects; Crystallization; Enthalpy; Entropy; Glass transition; Heat effects; High entropy metallic glass; High temperature effects; Interstitialcy theory; Interstitials; Material properties; Metallic glasses; Relaxation; Shear modulus; Thermodynamic properties; Relaxation; Interstitialcy theory; Shear modulus; High entropy metallic glass; Heat effects
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.154564

Mechanical and thermal properties of materials are intricately linked. Particularly, this fully applies to metallic glasses. In this work, we study shear modulus behavior and heat effects occurring upon heating up of Ti16.7Zr16.7Hf16.7Cu16.7Ni16.7Be16.7 high entropy bulk metallic glass up to the full crystallization. In the framework of the Interstitialcy theory, we show that shear modulus relaxation data can be applied to quantitatively predict exo- and endothermal effects related to structural relaxation, glass transition and crystallization of this high entropy metallic glass. This fact suggests that the underlying physical mechanism responsible for this link can be conditioned by the relaxation of the system of structural defects, which by their properties are similar to dumbbell interstitials in metals. •A relationship between the heat flow and shear modulus changes occurring upon structural relaxation and crystallization is analyzed.•All thermal effects are related to the alteration of shear modulus of metallic glass.•The anharmonicity of interatomic potential plays a critical role in the thermal flow and shear softening.