Synthesis and mechanical properties of highly structure-controlled Zr-based metallic glasses by thermal rejuvenation technique. (21st February 2023)

• Record Type: Journal Article
• Authors: Guo, Wei; Niiyama, Tomoaki; Yamada, Rui; Wakeda, Masato; Saida, Junji
• Is Part Of: Journal of physics. Volume 35:Number 15(2023)
• Publication Date: 2023-02-21
• Subjects: metallic glass -- relaxation -- rejuvenation -- mechanical property -- thermal process -- Zr-Al-Ni-Cu alloy; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/acb8a0
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: A novel thermal rejuvenation treatment facility for Zr-based bulk metallic glass (BMG) was developed, consisting of a rapid heating and indirect liquid nitrogen quenching process. The re-introduction of free volume into thermally rejuvenated BMG results in more disordered state. The rejuvenation improves ductility, implying that the re-introduced free volume aids in the recovery of the shear transformation zone (STZ) site and volume. Actually, it is confirmed that relaxation significantly reduces STZ volume; however, it is recovered by thermal rejuvenation. Molecular dynamics simulations also indicate that rejuvenation enhances homogeneous deformation. The current findings indicate that the thermal rejuvenation method is extremely effective for recovering or improving the ductility of metallic glass that has been lost due to relaxation.