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Dislocation Arrangements in Deformed and Neutron Irradiated Zirconium and Zircaloy-2

Abstract

Dislocation arrangements in deformed and neutron irradiated Zr and Zircaloy-2 have been studied by thin film transmission electron microscopy. Results indicate that the prominent slip system, in both Zr and Zircaloy-2, is the {l_brace}1010{r_brace} 1/3 <1210> type; no evidence for basal slip was observed. Attractive and repulsive dislocation interactions seem to be more important than the intersection jog reactions. Elongated loops and dipoles were seen at higher deformations and it is suspected that such loops or dipoles are formed due to interactions between dislocations lying in parallel planes. Stacking fault ribbons lying in {l_brace}1010{r_brace} plane have been found in 15% cold rolled Zircaloy-2: a rough estimate of stacking fault energy indicates that it is {approx} 65 ergs/cm{sup 2}. Calculations show that the equilibrium separation of partials is {approx} 60 A and a stress as high as 19x10{sup -3} {mu} acting along {l_brace}0010{r_brace} direction is needed to separate them. It has been suggested that O{sub 2} and N{sub 2} in addition to their solid solution hardening effect may also cause a lowering of the stacking fault energy and Suzuki hardening.
Authors:
Publication Date:
Dec 15, 1963
Product Type:
Technical Report
Report Number:
AE-130
Resource Relation:
Other Information: 17 refs., 22 figs.
Subject:
36 MATERIALS SCIENCE; ZIRCALOY 2; DISLOCATIONS; PHYSICAL RADIATION EFFECTS; NEUTRONS; TRANSMISSION ELECTRON MICROSCOPY; ZIRCONIUM
OSTI ID:
20930939
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708351
Availability:
Commercial reproduction prohibited; OSTI as DE20930939
Submitting Site:
SWDN
Size:
30 pages
Announcement Date:
Oct 01, 2007

Citation Formats

Roy, R B. Dislocation Arrangements in Deformed and Neutron Irradiated Zirconium and Zircaloy-2. Sweden: N. p., 1963. Web.
Roy, R B. Dislocation Arrangements in Deformed and Neutron Irradiated Zirconium and Zircaloy-2. Sweden.
Roy, R B. 1963. "Dislocation Arrangements in Deformed and Neutron Irradiated Zirconium and Zircaloy-2." Sweden.
@misc{etde_20930939,
title = {Dislocation Arrangements in Deformed and Neutron Irradiated Zirconium and Zircaloy-2}
author = {Roy, R B}
abstractNote = {Dislocation arrangements in deformed and neutron irradiated Zr and Zircaloy-2 have been studied by thin film transmission electron microscopy. Results indicate that the prominent slip system, in both Zr and Zircaloy-2, is the {l_brace}1010{r_brace} 1/3 <1210> type; no evidence for basal slip was observed. Attractive and repulsive dislocation interactions seem to be more important than the intersection jog reactions. Elongated loops and dipoles were seen at higher deformations and it is suspected that such loops or dipoles are formed due to interactions between dislocations lying in parallel planes. Stacking fault ribbons lying in {l_brace}1010{r_brace} plane have been found in 15% cold rolled Zircaloy-2: a rough estimate of stacking fault energy indicates that it is {approx} 65 ergs/cm{sup 2}. Calculations show that the equilibrium separation of partials is {approx} 60 A and a stress as high as 19x10{sup -3} {mu} acting along {l_brace}0010{r_brace} direction is needed to separate them. It has been suggested that O{sub 2} and N{sub 2} in addition to their solid solution hardening effect may also cause a lowering of the stacking fault energy and Suzuki hardening.}
place = {Sweden}
year = {1963}
month = {Dec}
}