Microstructural modeling of irradiation creep and swelling

Weiner, R.A.; Boltax, A.

doi:10.1016/0022-3115(77)90128-3

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…This is justified in the absence of vacancy loops by the fact that C. and C y have much smaller relaxation times than those for changes in the sink strengths [9], so that C. and C are in a steady state relative to the instantaneous sink strenghs. It has been assumed [5,6] and recently shown [7] that the vacancy loop distribution relaxation times are a w o short and hence that the vacancy loop distribution is in a steady state with respect to the instantaneous sink strength.…”

Section: Point Defect Trapping At Solutes and Vacancy Loopsmentioning

confidence: 99%

“…This paper will also include the vacancy loops formed during the collapse of damage cascades produced by energetic particles. In view of the increased attention accorded this subject in recent years [3][4][5][6][7] the simultaneous effect of vacancy loops and solute traps on the point defect concentrations and in particular on the dislocation climb creep rate will be "The irradiation creep rate due to dislocation climb has also been referred to as creep by stress-induced preferred absorption of point defects (SIPA) and creep by orientation-dependent capture efficiencies of dislocations for point defects. interstitials.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Irradiation-Induced Creep by Point-Defect Trapping

Mansur

Wolfer

1979

Effects of Radiation on Structural Materials

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The theory of point-defect trapping has been applied to predict the effect of solutes on the steady-state dislocation climb creep rate. A range of parameters of experimental relevance is considered. Vacancy loops generated in the cascades produced by heavy particles are included in the formalism. It is shown that the effect of vacancy loops on the creep rate is mathematically equivalent to a simultaneous reduction in the vacancy trapping rate at solutes as well as in the free point-defect generation rate and recombination coefficient. These parameters are reduced by the ratio of the sink strength without vacancy loops to the total sink strength. It is found that solute trapping and vacancy loops may reduce the unperturbed creep rates by up to an order of magnitude for the parametric range considered.

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Section: Point Defect Trapping At Solutes and Vacancy Loopsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduction of Irradiation-Induced Creep by Point-Defect Trapping

Mansur

Wolfer

1979

Effects of Radiation on Structural Materials

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“…These effects also been parameterized. There have also been efforts to include these various microstructural descriptors together with the appropriate boundary conditions, and to allow the microstructure to evolve numerically (70)(71)(72). These calculations require Care should be taken when interpreting these results since they apply to a single temperature, and it is known that changes in alloy composition can cause changes in the temperature dependence of swelling as shown in Figure 11.…”

Section: Void and Loop Nucleationmentioning

confidence: 99%

Effects of minor alloying additions on the strength and swelling behavior of an austenitic stainless steel. [4 MeV nickel ions]

Gessel¹

1978

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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, contractors, subcontractors, or their employees, makes any warranty, express or implied, nor assumes any legal liability or responsibility for any third party's use or the results of such use of any information, apparatus, product or process disclosed in this report, nor represents that its use by such th ird party would not infringe privately owned rights.

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“…More recently, Weiner and Boltax [3] developed a microstructural model of creep and swelling which included dislocations, voids, interstitial loops and vacancy loops. The creep model includes contributions from the stress induced preferential absorption (SIPA) driven climb of dislocations and loop growth.…”

Section: Introductionmentioning

confidence: 99%

A computational framework for modeling irradiation creep and swelling in single crystal nickel

Smith

Was

1986

Journal of Nuclear Materials

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A computational framework for modeling irradiation creep and swelling is developed to estimate creep strains, swelling strains and the dose dependent evolution of microstructural characteristics such as dislocation density, void number density and void size in pure, single crystal metals. This work represents an attempt to construct a comprehensive and self-consistent description of the physical processes that occur during the application of temperature, stress, and irradiation, in that cross-talk between individual microstructural models is allowed during their mutual evolution in time. The coupling of microstructural evolution to the strain generating models is responsible for the following results: the variation of the steady state creep rate with dose in the early part of the irradiation history; the observation that irradiation creep displays a maximum in temperature and falls off at high temperature, similar to swelling; the linear dependence of steady state creep on stress with a discontinuity at (r = 0 resulting from the influence of stress on the void number density. The major violation of self-consistency is the isolation of void nucleation from the microstructural evolution. The magnitudes of creep strains computed with the model compare favorably with measured values for nickel.

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Microstructural modeling of irradiation creep and swelling

Cited by 19 publications

References 16 publications

Reduction of Irradiation-Induced Creep by Point-Defect Trapping

Reduction of Irradiation-Induced Creep by Point-Defect Trapping

Effects of minor alloying additions on the strength and swelling behavior of an austenitic stainless steel. [4 MeV nickel ions]

A computational framework for modeling irradiation creep and swelling in single crystal nickel

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