1970
DOI: 10.1002/pssb.19700370215
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Effect of Neutron Irradiation on the Temperature Dependence of the Flow Stress for Niobium Single Crystals

Abstract: Yield stress and strain-rate data were obtained in compression a t various temperatures. Niobium single crystals were tested both in the irradiation and unirradiated condition. The neutron irradiation largely affected the athermal component of the flow stress, however, it also induced a smaller but measurable increase in the thermal component of stress. The data indicate that increasing solute content effects an athermal strengthening similar to that of neutron irradiation.Fur Niobiumeinkristalle wurden die St… Show more

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Cited by 6 publications
(5 citation statements)
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“…Figure 1b shows results for as a function of temperature (expressed as ) and for as a function of (inset to Fig. 1b ) obtained in this work as well as earlier literature data for bulk single crystals 18 , 19 . Despite the larger scatter and the expected stress-scale offset, both of which are characteristic for small-scale crystal deformation, the microcrystal data displays the anticipated stress-temperature scaling.…”
Section: Resultssupporting
confidence: 66%
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“…Figure 1b shows results for as a function of temperature (expressed as ) and for as a function of (inset to Fig. 1b ) obtained in this work as well as earlier literature data for bulk single crystals 18 , 19 . Despite the larger scatter and the expected stress-scale offset, both of which are characteristic for small-scale crystal deformation, the microcrystal data displays the anticipated stress-temperature scaling.…”
Section: Resultssupporting
confidence: 66%
“…The loading axis was oriented along the single-slip -orientation. All curves exhibit a size-dependent stress increase in comparison to a bulk reference crystal (~100 MPa at 298 K 18 , 19 ), as well as stress–strain instabilities (abrupt increments of strain), due to stochastic collective dislocation rearrangements. In between such intermittent stress–strain discontinuities, smooth quasi-static flow behavior is observed, indicating that the total strain can be decomposed into a fraction attributed to smooth plasticity of quiescent dislocation glide and a fraction generated by dislocation avalanches 20 .…”
Section: Resultsmentioning
confidence: 98%
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“…An interesting evaluation of equation ( 24) was made by Reed et al 107 for the strain dependence of niobium single crystals for which with V* being characteristically independent of strain for the bcc case, 1/M was shown to follow the same strain dependence as t. The result argues for V* having greater physical significance than M. And, further in the direction of developing a detailed TASRA based dislocation mechanics description of plastic flow is the mechanical threshold stress (MTS) model of Follansbee and Kocks 108 for the rate dependence of plastic flow also including history effects through evolution of the dislocation structure during plastic straining, as mentioned above for Klepaczko. 82 The MTS relation may be expressed in one way…”
Section: Relation To Other Constitutive Analysesmentioning
confidence: 99%
“…Nb (58,(65)(66)(67)(68), and V (47,48,(69)(70)(71). For vanadium, Arsenault (69) and Smolik and Chen (48) found roughly the same increase in yield stress upon irradiation for all test temperatures, as was also observed by Wechsler for niobium (68).…”
Section: Experimental Observations Of Radiation Hardeningmentioning
confidence: 99%