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Title: Junction Effects on Work Hardening Rates in Face-Centered Cubic Metals.

Abstract

Abstract not provided.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1398849
Report Number(s):
SAND2016-9857C
647947
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the Dislocations 2016 held September 19-23, 2016 in West Lafayette, IN.
Country of Publication:
United States
Language:
English

Citation Formats

Sills, Ryan B, Aghaei, Amin, Bertin, Nicolas, and Cai, Wei. Junction Effects on Work Hardening Rates in Face-Centered Cubic Metals.. United States: N. p., 2016. Web.
Sills, Ryan B, Aghaei, Amin, Bertin, Nicolas, & Cai, Wei. Junction Effects on Work Hardening Rates in Face-Centered Cubic Metals.. United States.
Sills, Ryan B, Aghaei, Amin, Bertin, Nicolas, and Cai, Wei. Sat . "Junction Effects on Work Hardening Rates in Face-Centered Cubic Metals.". United States. doi:. https://www.osti.gov/servlets/purl/1398849.
@article{osti_1398849,
title = {Junction Effects on Work Hardening Rates in Face-Centered Cubic Metals.},
author = {Sills, Ryan B and Aghaei, Amin and Bertin, Nicolas and Cai, Wei},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}

Conference:
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  • Abstract not provided.
  • During neutron irradiation, most face-centered cubic metals and alloys develop saturation or quasi-steady state microstructures. This, in turn, leads to saturation levels in mechanical properties and quasi-steady state rates of swelling and creep deformation. Swelling initially plays only a small role in determining these saturation states, but as swelling rises to higher levels, it exerts strong feedback on the microstructure and its response to environmental variables. The influence of swelling, either directly or indirectly via second order mechanisms, such as elemental segregation to void surfaces, eventually causes major changes, not only in irradiation creep and mechanical properties, but also onmore » swelling itself. The feedback effects of swelling on irradiation creep are particularly complex and lead to problems in applying creep data derived from highly pressurized creep tubes to low stress situations, such as fuel pins in liquid metal reactors.« less
  • The re-examination of presently available experimental evidence leads to the conclusion that discolorations differ in the ability to absorb or emit point defects by climb. Old dislocations, namely those which have been stationary during aging or annealing treatments, are not easy sources or sinks of vacancies, while new dislocations, i.e. dislocations which have moved during or since annealing treatments, are easy sources and sinks. Further differences exist in the interactions between point defects and dislocations of edge and screw type, and between mixed dislocations of different orientations, as well as between stationary or slowly moving and fast moving dislocations. Themore » major experimental results on the phenomenon of quench hardening reflect the multiplicity of types of interactions between dislocations and vacancies. Possible explanations are given for the peculiar tangles consisting of kinked and intertwined dislocations often found in face-centered cubic (fcc) metals, for the generation of small dislocation loops in deformed annealed material as well as their partial elimination in quenched or irradiated specimens, for the typical slip line structure, and for the occurrence of overshooting in quenched or irradiated material. Quenched or irradiated pure fcc metals are obviously greatly affected by the presence of vacancies in supersaturation. On the other hand, it is known that point defects are generated during slip, and also that, for deformed fcc pure metals, the dislocation configurations in both types of specimens are quite similar to each other. The conclusion is that the plastic behavior of annealed pure fcc metals and single crystals is also greatly influenced by vacancies and that theories of the plastic properties of metals must take this into consideration. It is further believed that the different mechanisms of interactions between point defects and dislocations play an important role in metal fatigue. (auth)« less
  • The low temperature tensile and creep behaviors of single crystals of Cu were evaluated and analyzed in such a manner as to provide an estimate of the separate contributions of short and long range stress fields to strain-hardening. Furthermore, the average force-displacement diagram for thermally activated intersection of two dislocations were estsblished. This diagram plus a knowledge of the variation of dislocation spacing and the long-range back stresses with strain permits an accurate prediction of creep rates. The calculated activation energy for intersection under conditions of a constant strain rate increased linearly with the absolute temperature as required by theory.more » (auth)« less