Relationship between the shear modulus and volume relaxation in high-entropy metallic glasses: Experiment and physical origin

We performed parallel measurements of the high-frequency shear modulus G and relative volume Delta V/V for high-entropy Ti20Zr20Hf20Be20Cu20 and Ti20Zr20Hf20Be20Ni20 glasses upon heating from room temperature up to the complete crystallization. The changes of these properties due to structural relaxation both below and above the glass transition temperature are singled out. It is shown that these changes for both initial and preannealed samples can be well described within the framework of the Interstitialcy theory. It is found that the whole relaxation process in the full temperature range of the experiments for both samples' states can be characterized by a single dimensionless temperature-independent parameter Ki = din G/din V , which equals to -44 and -53 for the above glasses, respectively, and strongly points at interstitial-type defects as a source of the relaxation. We also show that relaxation of the relative volume linearly depends on the defect concentration.