|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||G-43: High Thermal Stability and Sluggish Crystallization Kinetics of High-entropy Bulk Metallic Glasses
||Ming Yang, Xiongjun Liu, Qing Du, Yuan Wu, Hui Wang, Z.P. Lv
|On-Site Speaker (Planned)
MGs are metastable and their thermal stability is critical for practical applications at elevated temperatures. Conventional BMGs, though exhibiting high glass-forming ability(GFA), crystallize quickly when being heated to temperatures above glass transition temperature. This problem may be alleviated by the developments of high-entropy bulk metallic glasses(HE-BMGs). Here we chose two typical HE-BMGs, i.e., ZrTiHfCuNiBe and ZrTiCuNiBe with higher kinetic stability, as compared with their benchmark glass Vit1 for researching. The activation energy for glass transition and crystallization of HE-BMGs is much larger than Vit1. Moreover, the crystallization region of HE-BMGs is wider than Vit1. HRTEM characterization of the crystallized products at different temperatures further confirms the high thermal stability of HE-BMGs. Surprisingly, the HE-BMGs show small fragility value, which contradicts with their low GFA, suggesting the underlying diffusion mechanism in the liquid and solid of HE-BMGs is different.
||Planned: Supplemental Proceedings volume