|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Tailoring glass characteristics via deliberate control of icosahedral ordering in quasi-glass forming alloys
||Geun Hee Yoo, Wook Ha Ryu, Chae Woo Ryu, Ke fu Yao, Eun Soo Park
|On-Site Speaker (Planned)
||Geun Hee Yoo
Icosahedral medium-range order (IMRO) in metallic glasses (MGs), the atomic model of interpenetrating icosahedra, significantly affects mechanical properties. It has been reported that it is difficult to control the ordering inside the MG, but it was recently found that icosahedral ordering has high stability in Ti-Zr-Ni-Be alloy system.
In the present study, we investigate the relationship between degrees of icosahedral ordering and mechanical properties of Ti-Zr-Ni-Be metallic glasses by systematically controlling Be contents. Statistical analysis of the shear avalanches reveals that less-ordered icosahedral structure promotes a relatively large number of shear deformation units, and can even increase the mechanical stability of the macroscale deformation to induce superplastic compressive plasticity in Ti-Zr-Ni-Be MG. We can carefully figure out that the formation of frustrated IMRO in the densely packed structure can apply high glass forming ability and mechanical stability, which can be a new guideline for the development of sustainable BMG.