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Title: 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 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.
Authors:
; ; ; ; ; ; ;  [1]
  1. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900 (China)
Publication Date:
OSTI Identifier:
22413078
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIAMONDS; GRAIN ORIENTATION; PHASE TRANSFORMATIONS; PRESSURE DEPENDENCE; PRESSURE GRADIENTS; PRESSURE RANGE GIGA PA; SHOCK WAVES; STRAINS; TANTALUM; TEMPERATURE RANGE 0273-0400 K; YIELD STRENGTH