Mechanical Behavior of Zr-based Bulk Metallic Glasses and their Composites at Cryogenic Temperatures

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2007.0054· OSTI ID:931267

Fan, Cang ^[1]; Gao, Yanfei ^[2]; Li, Hongqi ^[1]; Choo, Hahn ^[2]; Liaw, Peter K ^[1]; Inoue, A. ^[3]; Liu, Chain T ^[2]

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1. University of Tennessee, Knoxville (UTK)
2. ORNL
3. Tohoku University, Japan

The mechanical behavior of Zr-Cu-Al bulk metallic glasses (BMGs) and in situ Ta-particle-containing composites (BMGCs) was investigated at 77 K. Their strength increased significantly while the plastic strains remained comparable value, when compared with that at 298 K. The interaction between shear bands and particles shows that shear extension in particles has limited penetration, and shear bands build up around particles. Based on a study of pair distribution functions (PDFs), carried out at cryogenic and ambient temperatures, on the as-cast Zr-Cu-Al BMGs, simulations with Reverse Monte Carlo were performed by combining icosahedral and cubic structures as the initial structures. The PDFs and the refined structure showed the existence of clusters and free volume between the clusters. An attempt has been made to connect the relationship between amorphous structures and their mechanical properties.

• Research Organization: Oak Ridge National Laboratory (ORNL); Center for Computational Sciences
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931267
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 2 Vol. 22; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMBIENT TEMPERATURE
CRYOGENICS
DISTRIBUTION FUNCTIONS
MECHANICAL PROPERTIES
METALLIC GLASSES
PLASTICS
SHEAR
STRAINS