Large tensile plasticity induced by pronounced β-relaxation in Fe-based metallic glass via cryogenic thermal cycling. (October 2022)

• Record Type: Journal Article
• Authors: Di, Siyi; Ke, Haibo; Wang, Qianqian; Zhou, Jing; Zhao, Yong; Shen, Baolong
• Is Part Of: Materials & design. Volume 222(2022)
• Publication Date: 2022-10
• Subjects: Metallic glass -- Tensile plasticity -- Cryogenic thermal cycling -- β-relaxation; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2022.111074
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: FeCoBSiNb metallic glass shows pronounced β -relaxation and large tensile plasticity after cryogenic thermal cycling. Increase of structural heterogeneity leads to pronounced β -relaxation and enhanced tensile plasticity. β -relaxation exhibits separate peaks with diverse cycling temperatures, which is resulted from different sizes/types of shear transformation zones. Abstract: The effects of cryogenic thermal cycling (CTC) treatment on tensile plasticity and structure change of [(Fe0.5 Co0.5 )0.75 B0.2 Si0.05 ]96 Nb4 metallic glass (MG) ribbons were systematically investigated. Pronounced β -relaxation peaks locating at 643 and 693 K were observed after CTC treatment with diverse thermal temperatures. Specifically, the CTC treated samples exhibiting most remarkable β -relaxation showed tensile plastic strain of 5.2% at 643 K and 4% at 693 K, while the as-quenched sample only showed tensile plastic strain of 3% at 643 K and 2.1% at 693 K. The pronounced β -relaxation and enhanced tensile plasticity are considered to be originated from the increased structural heterogeneity. The separate β -relaxation peaks result from the different sizes/types of shear transformation zones induced by oscillatory (rejuvenation-relaxation) behavior during thermal cycling. Our results indicate that the CTC treatment has a significant impact on the energy states and structural heterogeneity, which makes it a powerful means to modify the mechanical properties of MGs.