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| Correlation between mechanical and thermodynamic properties for La�CCe�CNi�CCu�CAl high-entropy metallic glasses |
| Lin Wu1 . Yong Zhao1 . Jun-jun Li1 . Ji-li Wu1 . Bo Zhang1 |
| 1 Institute of Amorphous Matter Science and School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China |
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Abstract Abstract: The mechanical properties, thermodynamic features and their correlation were studied for La�CCe�CNi�CCu�CAl high-entropy bulk metallic glasses (HE-BMGs). Compressive testing indicated that the HE-BMGs are ductile on a microscopic scale but brittle on a macroscopic scale, because of the low fragility index m of the HE-BMGs. In the non-isothermal process, the activation energies for glass transition for these HE-BMGs are the lowest of the known HE-BMGs. Large values of the Avrami exponent n imply that the crystallization process proceeded through three-dimensional growth and with an increasing nucleation rate. The activation energy for glass transition (Eg) is almost proportional to the HE-BMG fracture strength, because a higher Eg is required to dislodge the molecules from the glassy con.guration for the HE-BMGs with a high strength. The .ndings provide unambiguous evidence for the correlation between the mechanical and thermodynamic properties.
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Received: 04 December 2017
Published: 23 October 2018
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2018, Vol. 25 
