Anomalous softening of yield strength in tantalum at high pressures

The pressure dependence of the yield strength of tantalum was investigated experimentally up to 101 GPa at room temperature using a diamond anvil cell. A yield strength softening is observed between 52 and 84 GPa, whereas a normal trend is observed below 52 GPa and above 84 GPa. The onset pressure o...

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Bibliographic Details
Published in:Journal of applied physics 2015-02, Vol.117 (5)
Main Authors: Jing, Qiumin, Wu, Qiang, Xu, Ji-an, Bi, Yan, Liu, Lei, Liu, Shenggang, Zhang, Yi, Geng, Huayun
Format: Article
Language:English
Subjects:
Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Diamond anvil cells
DIAMONDS
GRAIN ORIENTATION
PHASE TRANSFORMATIONS
Preferred orientation
PRESSURE DEPENDENCE
PRESSURE GRADIENTS
PRESSURE RANGE GIGA PA
SHOCK WAVES
Softening
STRAINS
Structural damage
TANTALUM
TEMPERATURE RANGE 0273-0400 K
YIELD STRENGTH
Yield stress
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Summary:The pressure dependence of the yield strength of tantalum was investigated experimentally up to 101 GPa at room temperature using a diamond anvil cell. A yield strength softening is observed between 52 and 84 GPa, whereas a normal trend is observed below 52 GPa and above 84 GPa. The onset pressure of the softening is in agreement with previous results obtained by the pressure gradient method and shock wave experiments. This unusual strength softening in tantalum is not related with structural transformation, preferred orientation, or material damage. Our measurements indicate that microscopic deviatoric strain is the major reason for the observed strength softening in tantalum.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4906977