The effects of neutron irradiation on the activation parameters for slip in iron

McRickard, S. B.

doi:10.1016/0001-6160(68)90083-7

Cited by 15 publications

(3 citation statements)

References 8 publications

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“…4) is not necessarily caused by an increase of the athermal stress a,,, as postulated in Ref. (10). It is more likely that on the one hand the irradiation increases-analogous to the findings on single crystals or on hydrogen-purified polycrystals-the effective stress a* and at the same time decreases the unpinning stress kyd-1/2.…”

Section: ) Chow Etsupporting

confidence: 52%

Neutron radiation hardening of polycrystalline iron

Seidel

1969

Radiation Effects

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The dependence of the yield stress of vacuum-annealed and hydrogen-purified iron polycrystals on neutron dose and annealing temperature and the influence of these two parameters on the effect of static strain-ageing has been investigated. The radiation hardening was found to depend sensitively on the interstitial impurities N and C. This may be explained by both a nucleation of precipitation and a trapping of the impurities at radiation produced intrinsic defects. The radiation enhanced precipitation predominates in the relatively impure iron samples at low doses and may be eliminated by annealing at 190°C. The trapping becomes effective 'at higher doses or in higher purity iron. Below 400°C two recovery stages for the yield stress are observed, one between 200 and 260 "C and the other between 320 and 400 "C; these may be explained by the detrapping of N and C respectively. The static strain-ageing was found to be reduced by neutron irradiation. It reappears after annealing at temperatures at which the precipitates are thought to be redissolved and the C and N atoms to be detrapped.

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Section: ) Chow Etsupporting

confidence: 52%

Neutron radiation hardening of polycrystalline iron

Seidel

1969

Radiation Effects

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“…They further on reported that the effective stress was also increased by irradiation when tested at low temperatures 15) . McRickard et al 16) carried out stress relaxation tests at a low strain rate (<0.01 s −1 ) for neutron irradiated (2 × 10 22 n/m 2 ; E n > 1 MeV) Ferrovac iron, and came to the same trend with them for activation volume and athermal stress. Early works 17,18) on neutron (539 K; 0.5, 4, and 6.5 × 10 23 n/m 2 ; E n > 1 MeV) irradiated ASTM A533-B steel showed that for all the testing temperatures, increasing uence led to an increase in yield stress and to a decrease in strain rate sensitivity.…”

Section: Introductionmentioning

confidence: 88%

Ion-Irradiation Effect on Strain Rate Sensitivity of Nanoindentation Hardness of W Single Crystal

et al. 2017

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The local strain rate (LSR) dependence of nanoindentation (NI) hardness was investigated by using standard constant strain rate (CSR) test method and strain rate jump (SRJ) test method for W single crystal with the surface orientation of {001} before and after 6.4 MeV Fe 3+ irradiations (nominal damage level of 0.1, 1 and 2 dpa, 573 K). The effect of ion-irradiation on the LSR sensitivity of NI-hardness at room temperature (RT) was evaluated by changing LSR between 0.3 s −1 and 0.01 s −1 or 0.03 s −1 and 0.001 s −1. Under these experimental conditions, ion-irradiation increases NI-hardness and slightly decreases LSR sensitivity of NI-hardness for all damage levels. The effect is more pronounced with increasing damage level. The LSR sensitivity values are ranging between 0.015 and 0.04 in SRJ tests, and between 0.0425 and 0.06 in CSR tests, indicating that the deformation of bcc W{001} at RT is controlled by a high lattice friction stress. The decrease in LSR sensitivity by ion-irradiation could be attributed to the increase in the athermal stress caused by ion-irradiation induced defect structures, which is re ected to a decrease in the activation volume of dislocation motion in ion-irradiated W{001}.

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“…show significant tempera-18 2 ture sensitivities at and above a fluence of 2x10 n/cm [all fluences, E>1 MeV). In high purity iron, however, the hardening appears athermal well past the saturation fluence[53,54). Since vanadium and niobium have been considered for reactor core materials, their end-of-life fluences could 23 2 approach 10 n/cm .…”

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confidence: 99%

Dispersed barrier hardening in irradiated metals

Beck

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The effects of neutron irradiation on the activation parameters for slip in iron

Cited by 15 publications

References 8 publications

Neutron radiation hardening of polycrystalline iron

Neutron radiation hardening of polycrystalline iron

Ion-Irradiation Effect on Strain Rate Sensitivity of Nanoindentation Hardness of W Single Crystal

Dispersed barrier hardening in irradiated metals

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