Journal Published Online: 24 April 2008
Volume 5, Issue 4

Application of Digital Marker Extensometry to Determine the True Stress-Strain Behavior of Irradiated Metals and Alloys

CODEN: JAIOAD

Abstract

To study the mechanisms of deformation hardening and flow localization of radioactive materials, a noncontact “digital marker extensometry” technique has been employed. It allows researchers to easily define plasticity parameters and true stresses in experiments where highly radioactive miniature specimens are used. The engineering and “true stress-true local strain” relationships of irradiated metal polycrystals during plastic flow and hardening have been investigated experimentally after irradiation in two reactors in Kazakhstan. The true curves were obtained for copper, nickel, iron, molybdenum, as well as for the Russian stainless steels 08Cr16Ni11Mo3 and 12Cr18Ni10Ti. Describing these curves using the equation σi0 + kεi demonstrates that the concept of ultimate stress in highly irradiated materials is an artifact arising from flow localization and is not fully informative of the operating hardening mechanisms.

Author Information

Gusev, M.
Institute of Nuclear Physics, Almaty, Kazakhstan
Maksimkin, O.
Institute of Nuclear Physics, Almaty, Kazakhstan
Osipov, I.
Institute of Nuclear Physics, Almaty, Kazakhstan
Garner, F.
Pacific Northwest National Laboratory, Richland, Washington
Pages: 10
Price: $25.00
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Stock #: JAI101073
ISSN: 1546-962X
DOI: 10.1520/JAI101073