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Understanding the Fracture Behaviors of Metallic Glasses—An Overview

by Guan-Nan Yang 1,2,3,*, Yang Shao 2,3 and Ke-Fu Yao 2,3,*
1
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
2
School of Material Science and Engineering, Tsinghua University, Beijing 100084, China
3
Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(20), 4277; https://doi.org/10.3390/app9204277
Received: 17 September 2019 / Revised: 30 September 2019 / Accepted: 3 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue Fatigue and Fracture of Non-metallic Materials and Structures)
Fracture properties are crucial for the applications of structural materials. The fracture behaviors of crystalline alloys have been systematically investigated and well understood. The fracture behaviors of metallic glasses (MGs) are quite different from that of conventional crystalline alloys and have drawn wide interests. Although a few reviews on the fracture and mechanical properties of metallic glasses have been published, an overview on how and why metallic glasses fall out of the scope of the conventional fracture mechanics is still needed. This article attempts to clarify the up-to-date understanding of the question. We review the fracture behaviors of metallic glasses with the related scientific issues including the mode I fracture, brittle fracture, super ductile fracture, impact toughness, and fatigue fracture behaviors. The complex fracture mechanism of MGs is further discussed from the perspectives of discontinuous stress/strain field, plastic zone, and fracture resistance, which deviate from the classic fracture mechanics in polycrystalline alloys. Due to the special deformation mechanism, metallic glasses show a high variability in fracture toughness and other mechanical properties. The outlook presented by this review could help the further studies of metallic glasses. The review also identifies some key questions to be answered. View Full-Text
Keywords: metallic glasses; fracture; shear bands; mechanical properties; fracture mechanism metallic glasses; fracture; shear bands; mechanical properties; fracture mechanism
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Yang, G.-N.; Shao, Y.; Yao, K.-F. Understanding the Fracture Behaviors of Metallic Glasses—An Overview. Appl. Sci. 2019, 9, 4277.

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