TY - JOUR
T1 - Transmission electron microscopy observations and micromechanical/continuum models for the effect of hydrogen on the mechanical behaviour of metals
AU - Sofroni, P.
AU - Robertson, I. M.
N1 - Funding Information:
ACKNOWLEDGEMENTS This paper summarizes the cumulative efforts of a number of graduate students and post-doctoral fellows that we have had the pleasure to work with over the years. Their contributions were invaluable. Special thanks are extended to our colleague and friend, Professor Howard Birnbaum, without whose encouragement, advice and support this work would not have been possible. This work was supported by the US Department of Energy under grant DEFG02-96ER45439. Use of the microscope facilities at the Center for Microanalysis in the Frederick Seitz Materials Research Laboratory is acknowledged.
PY - 2002/11
Y1 - 2002/11
N2 - In-situ deformation studies in a transmission electron microscope equipped with an environmental cell have shown that solute hydrogen increases the velocity of dislocations, decreases the stacking-fault energy, and increases the stability of edge character dislocations. Theoretical modelling has established that the hydrogen atmospheres formed at dislocations through the elastic interaction cause a change in the stress field of the dislocation-hydrogen complex in such a manner as to reduce the interaction energy between it and other elastic obstacles. Consequently, solute hydrogen increases the mobility of dislocations, which will be localized to regions of high hydrogen concentration. On the basis of this material softening on the microscale, a solid mechanics analysis of the hydrogen solute interaction with material elastoplasticity demonstrates that localization of the deformation in the form of bands of intense shear can occur on the macroscale. Thus, the present combined experimental and numerical/ analytical results provide a clear explanation for the hydrogen-enhanced localized plasticity mechanism of hydrogen embrittlement.
AB - In-situ deformation studies in a transmission electron microscope equipped with an environmental cell have shown that solute hydrogen increases the velocity of dislocations, decreases the stacking-fault energy, and increases the stability of edge character dislocations. Theoretical modelling has established that the hydrogen atmospheres formed at dislocations through the elastic interaction cause a change in the stress field of the dislocation-hydrogen complex in such a manner as to reduce the interaction energy between it and other elastic obstacles. Consequently, solute hydrogen increases the mobility of dislocations, which will be localized to regions of high hydrogen concentration. On the basis of this material softening on the microscale, a solid mechanics analysis of the hydrogen solute interaction with material elastoplasticity demonstrates that localization of the deformation in the form of bands of intense shear can occur on the macroscale. Thus, the present combined experimental and numerical/ analytical results provide a clear explanation for the hydrogen-enhanced localized plasticity mechanism of hydrogen embrittlement.
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U2 - 10.1080/01418610208240451
DO - 10.1080/01418610208240451
M3 - Article
AN - SCOPUS:0037146411
SN - 0141-8610
VL - 82
SP - 3405
EP - 3413
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
IS - 17-18
ER -