Large Compressive Plasticity of Brittle La69Co17Al14 Bulk Metallic Glass Under Constrained Compression

• Published in: Metals and materials international Vol. 29; no. 3; pp. 870 - 873
• Main Authors: Shao, K. W., Zhou, W. H., Gao, K., Zhu, X. G., Jia, P., Li, Y.
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01-03-2023; Springer Nature B.V; 대한금속·재료학회
• Subjects: Amorphous materials; Aspect ratio; Brittleness; Catastrophic failure analysis; Characterization and Evaluation of Materials; Chemistry and Materials Science; Ductile-brittle transition; Engineering Thermodynamics; Enthalpy; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic glasses; Metallic Materials; Plastic properties; Processes; Solid Mechanics; 재료공학; Compressive plasticity; Amorphous materials; Thermal analysis; Aspect ratio; Brittle-ductile transition
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-022-01257-x

Catastrophic brittle failure prevents the application of bulk metallic glasses (BMGs).The brittle La
69
Co
17
Al
14
BMG shows large compressive plasticity when compressed in constrained conditions. Here the compressive plasticity of this BMG was systematically studied by decreasing aspect ratio (height/diameter) of the samples in uniaxial compression and the brittle-ductile transition occurs at an aspect ratio of 0.36. With the increase of the plasticity (decrease of the aspect ratio), the hardness decreases firstly and then increases, however, the relaxation enthalpy indicating its structure increases monotonically. Our findings provide a powerful experimental support for the application of brittle La-based BMGs.
Graphic Abstract