Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 42A, Issue 6, Pages 1491-1498Publisher
SPRINGER
DOI: 10.1007/s11661-011-0632-0
Keywords
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Funding
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0900271] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [909037] Funding Source: National Science Foundation
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The compressive-deformation behavior of the Zr50.7Cu28Ni9Al12.3 bulk metallic glass (BMG) was investigated over a wide strain-rate range at room temperature. The yield strength of the BMG studied is independent of the strain rates applied upon quasi-static loading; however, it decreases remarkably upon dynamic loading. Serrated flows and shear bands appear at low quasi-static strain rates; nevertheless, they vanish as the strain rate increases to 1.0 x 10(-1) s(-1). Cracks appearing on the side surface of the fractured sample after dynamic compression yield a strain-accommodation deformation mechanism upon dynamic loading. Scanning electron microscopy observations reveal that molten liquids increase on the fractured surfaces with increasing strain rate, indicating that adiabatic heating in the shear bands is enhanced as the strain rate increases.
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