Mechanical Effects of Electron Irradiation in Iron Single Crystals Page: 4 of 9
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structures of the irradiated and unirradiated iron specimens were nearly
identical,5 the enhancement of dislocation motion by electron irradiation
appears to be primarily responsible for the observed softening. The
misfit strain associated with dispersed interstitials exerts a couple
force on screw dislocations, enhancing the double kink formation,6 and
can be the cause of the softening. The orientation dependence suggests
that the core structure of a screw dislocation and/or the potential
variation for the screw. dislocation gliding on the different slip planes
may also be sensitively altered by the presence of the interstitials.
EXPERIMENTAL RESULTS
The experimental procedures are detailed in our earlier reports.1,7
The essential points are: (1) The Battelle-AISI iron containing less
than 5 wt. ppm of non-metallic impurities and 30 wt. ppm of metallic
impurities was used as the starting material; (2) The single crystal
growth and the subsequent annealing were performed in the ZrH2 purified
hydrogen atmosphere; (3) The 2 MeV electron irradiation-was carried
out below 6e with dosages up to 6.2 x 1018 e/cm2 (estimated inter-
stitial concentration - 100 ppm).
Orientation Dependence
The dependence of the yield stress of bcc metals on the crystallo-
graphic orientation of the tensile axis is well known.8 However, the
correlation of this orientation dependence with the effects of solutes,
or point defects, has not been investigated except in a few cases. In
this investigation two directional parameters, X and X, were varied to
study the relation of the orientation with the irradiation effect.
X represents the angle between the tensile axis and [110], and was-104
when X was varied. X represents the angle between [101] and the normal
to the maximum resolved shear stress plane containing the primary Burgers
vector, a/2[111]. Therefore the maximum resolved shear stress plane
coincides with the (211), (101) and (112) planes for X = -3e* , 0 and
30* respectively. The variation of the irradiation softening with X was
striking (Fig. 1). At X e 30 a large softening effect was observed.I i
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Meshii, M. & Sato, A. Mechanical Effects of Electron Irradiation in Iron Single Crystals, article, January 1, 1976; Evanston, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc872369/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.