Plastic instability in amorphous selenium near its glass transition temperature

The deformation behavior of amorphous selenium near its glass transition temperature (31 °C) has been investigated by uniaxial compression and nanoindentation creep tests. Cylindrical specimens compressed at high temperatures and low strain rates deform stably into barrel-like shapes, while tests at...

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Bibliographic Details
Published in:Journal of materials research 2010-06, Vol.25 (6), p.1015-1019
Main Authors: Su, Caijun, LaManna, James A., Gao, Yanfei, Oliver, Warren C., Pharr, George M.
Format: Article
Language:English
Subjects:
Amorphous
Applied and Technical Physics
Biomaterials
COMPRESSION
CREEP
DEFORMATION
FRAGMENTATION
GLASS
Hardness
Inorganic Chemistry
INSTABILITY
KINETICS
Materials Communication
Materials Communications
Materials Engineering
MATERIALS SCIENCE
Nanoindentation
Nanotechnology
PLASTICS
SELENIUM
SHAPE
STRAIN RATE
STRAINS
TRANSITION TEMPERATURE
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Summary:The deformation behavior of amorphous selenium near its glass transition temperature (31 °C) has been investigated by uniaxial compression and nanoindentation creep tests. Cylindrical specimens compressed at high temperatures and low strain rates deform stably into barrel-like shapes, while tests at low temperatures and high strain rates lead to fragmentation. These results agree well with stress exponent and kinetic activation parameters extracted from nanoindentation creep tests using a similarity analysis. The dependence of the deformation modes on temperature and strain rate can be understood as a consequence of material instability and strain localization in rate-dependent solids.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2010.0141