Post-Irradiation Properties of Candidate Materials for High-Power Targets Page: 3 of 3
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a)
- first cycle
last cycle
- non-irradiated-c
a
0
C
a
In50 100 150 200
Temperature(C)300-
250-
200-
150-
100-
50-
0-250 300
first cycle
last cycle
non-irradiated0 100 200 300
Temp(C)b)
-J
C
a
ii
C
W14-
12-
10-
8.
6.
4.2.
0"-first cycle
last cycle
- non-irradiated
50 100 150 200 250 300
Temperature(C)Figure 4: Expansion vs. temperature of CC composites: a)
expansion along one of the fiber axes; b) expansion at 450
to the fiber axes.
this desirable feature with radiation doses only a fraction
of a DPA. However, we find that the original behavior of
the coefficient of thermal expansion can be largely restored
by appropriate thermal cycling. We confirm that the mod-
ulus of elasticity (slope of the stress-strain curve) is little
affected by radiation damage, and we confirm that the duc-
tility of materials near yield stress can be significantly re-
duced (embrittlement), which effect is very pronounced in
the Toyota " gum" metal.
ACKNOWLEDGMENTS
This work was supported in part by US DOE Contract
NO. DE-AC02-98CH10886.
REFERENCES
[1] P. Thieberger, H.G. Kirk, R.J. Weggel, K.T. McDonald. Mov-
ing Solid Metallic Targets for Pion Production in the MuonFigure 5: Expansion vs. temperature of Super-Invar at
higher temperature cycles. The coefficient of thermal ex-
pansion is restored to its non-irradiated value after anneal-
ing at temperatures above 500 C..
o.
Nl1600-
1400-
1200-
1000-
800-
600-
400-
200-Ut
Gum metal Stress-Strain
- rrad-1
Irrad-2
Nrrad-3
Non-irradiated1 5 10 15 20 25
Pseudo-Strain(%)30 35 40
Figure 6: Effects of irradiation on the stress-strain rela-
tionship of the "gum" metal [4]. The radiation dose was
greatest in sample 3, and least in sample 1, of the irradiated
sample. The straightness of the curve for sample 3 indi-
cates an almost complete loss of ductility compared to the
non-irradiated sample.
Collider/Neutrino Factory Project, Proc. 2003 Part. Accel.
Conf. (Portland, OR, May 2003), p. 1634.
[2] H.G. Kirk et al., Super-Invar as a Target for a Pulsed High-
Intensity Proton Beam, Proc. 2003 Part. Accel. Conf. (Port-
land, OR, May 2003), p. 1628.
[3] H.G. Kirk et al., Target Studies with BNL E951 at the AGS,
Proc. 2001 Part. Accel. Conf. (Chicago, IL, March 2001),
p. 1535.
[4] T. Saito et al., Multifunctional Alloys Obtained via a
Dislocation-Free Plastic Deformation Mechanism, Science
300, 460 (2003).
[5] APT Materials Handbook, TPO-P00-MDD-X-00001 (2001).14-
12-
10-
8-
a-
4-
2-
0-
-2-
-4--J
C
a
c
a
a
W400 500 600
/ f
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Kirk, H. G.; Ludewig, H.; Mausner, L. F.; Simos, N.; Thieberger, P.; Hayato, Y. et al. Post-Irradiation Properties of Candidate Materials for High-Power Targets, article, March 15, 2006; Menlo Park, California. (https://digital.library.unt.edu/ark:/67531/metadc878397/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.