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ASTM Selected Technical Papers
Effects of Radiation on Materials
By
D Kramer
D Kramer
1
Rockwell International
,
Canoga Park, Calif. 91304
;
symposium chairman and co-editor
.
Search for other works by this author on:
HR Brager
HR Brager
2
Westinghouse Hanford Co.
,
editor
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JS Perrin
JS Perrin
3
Batelle Columbus Laboratories
,
editor
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ISBN-10:
0-8031-0755-2
ISBN:
978-0-8031-0755-7
No. of Pages:
777
Publisher:
ASTM International
Publication date:
1981

The Frank loop and dislocation microstructures developed in three face-centered cubic alloys during fast reactor irradiation have been examined to determine the influence of applied and internally generated stress on loop evolution. It is shown that anisotropic stresses generate a corresponding anisotropy of Frank loop populations on the four close-packed planes. The loop populations thus represent a microstructural record of the irradiation creep processes in action. The ease of interpreting this record depends on the relative magnitudes of external and internal stresses.

Metals with low irradiation creep rates which also undergo concurrent and substantial phase changes during irradiation are subject to large and indeterminate levels of internally generated stress which render the microstructural record uninterpretable with respect to the applied stress state. When the internally generated stresses are small in comparison to the externally applied stresses, a clear record of the stress-induced preferential absorption of interstitials (SIPA) growth mechanism of irradiation creep is imprinted at low neutron fluences in the density and sizes of loops present on each set of close-packed planes. This record fades at higher fluences when the continued anisotropic formation, growth, and unfaulting of Frank loops generate a corresponding anisotropy in the resultant free dislocation network, a process which alters the competition of sinks for point defects.

1.
Okamoto
,
P. R.
and
Harkness
,
S. D.
,
Journal of Nuclear Materials
 0022-3115, Vol.
48
,
1973
, p. 49.
2.
Brager
,
H. R.
,
Garner
,
F. A.
, and
Guthrie
,
G. L.
,
Journal of Nuclear Materials
 0022-3115, Vol.
66
,
1977
, p. 301.
3.
Garner
,
F. A.
and
Wolfer
,
W. G.
,
Transactions
,
American Nuclear Society
,
1978
, p. 144.
4.
Garner
,
F. A.
,
Wolfer
,
W. G.
, and
Brager
,
H. R.
in
Effects of Radiation on Structural Materials
, ASTM STP 683,
Sprague
J. A.
and
Kramer
D.
, Eds.,
American Society for Testing and Materials
,
1979
, pp. 160-183.
5.
Wolfer
,
W. G.
, “
Correlation of Radiation Creep Theory with Experimental Evidence
,”
University of Wisconsin Report
 0022-3115 UWFDM-312; also accepted for publication in
Journal of Nuclear Materials
 0022-3115.
6.
Garner
,
F. A.
,
Gilbert
,
E. R.
, and
Porter
,
D.
, this publication, pp. 680-697.
7.
Paxton
,
M. M.
,
Chin
,
B. A.
,
Gilbert
,
E. R.
, and
Nygren
,
R. E.
,
Journal of Nuclear Materials
 0022-3115, Vol.
80
,
1979
, p. 144.
8.
Brager
,
H. R.
,
Garner
,
F. A.
,
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,
E. R.
,
Flinn
,
J. E.
, and
Wolfer
,
W. G.
in
Radiation Effects in Breeder Reactor Structural Materials
,
Bleiberg
M. L.
and
Bennett
J. W.
, Eds.,
The Metallurgical Society of the American Institute of Mining, Metallurgical and Petroleum Engineers
,
1977
, pp. 479-507.
9.
Wolfer
,
W. G.
and
Ashkin
,
M. J.
,
Journal of Applied Physics
 0021-8979, Vol.
46
,
1975
, p. 547.
10.
Wolfer
,
W. G.
,
Mansur
,
L. K.
, and
Sprague
,
J. A.
in
Radiation Effects in Breeder Reactor Structural Materials
,
Bleiberg
M. L.
and
Bennett
J. W.
, Eds.
The Metallurgical Society of the American Institute of Mining, Metallurgical and Petroleum Engineers
,
1977
, p. 841.
11.
Gelles
,
D. S.
in
Proceedings
,
International Conference on Dislocation Modeling of Physical Systems
,
Gainesville, Fla.
, 22–27 June 1980; to be published as an
Acta/Scripta Metallurgica
conference proceedings.
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