Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Effects Of Copper Concentration And Neutron Flux On Irradiation Hardening And Microstructure Evolution In Fe Cu Model Alloys full books in PDF, epub, and Kindle. Read online Effects Of Copper Concentration And Neutron Flux On Irradiation Hardening And Microstructure Evolution In Fe Cu Model Alloys ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Stan T. Rosinski
Publisher : ASTM International
ISBN 13 : 0803128789
Total Pages : 879 pages
Book Rating : 4.8/5 (31 download)
Download or read book Effects of Radiation on Materials written by Stan T. Rosinski and published by ASTM International. This book was released on 2001 with total page 879 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. Morishita
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (125 download)
Download or read book Effects of Copper Concentration and Neutron Flux on Irradiation Hardening and Microstructure Evolution in Fe-Cu Model Alloys written by K. Morishita and published by . This book was released on 2001 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Irradiation hardening and microstructure evolution under neutron irradiation have been investigated for pure Fe, Fe-0.15Cu, Fe-0.28Cu and Fe-0.46Cu alloys. All the alloys were annealed at 780°C for 20 min and quenched in iced water. Neutron irradiations were performed in the Japan Material Test Reactor (JMTR) up to a fluence of about 1 x 1022n/m2 at different fluxes (3.0 x 1016 and 1.5 x 1015 n/m2s) at 290°C utilizing a so-called "multi-division temperature control irradiation rig" to investigate flux effects under controlled irradiation temperature and flux. The irradiation hardening increased with increasing copper concentration. Positron annihilation lifetime spectrometry (PAS) revealed that the second lifetime component (?2) was observed only in pure iron and Fe-0.15Cu alloy irradiated at the low flux condition. As for the flux effect, the irradiation hardening was larger at the lower flux condition in all the model alloys and A533B steel. Post-irradiation annealing experiments indicated that there were two recovery stages: the first was above 350°C and the second was around 550°C. The amount of hardening recovery in the first stage decreased with increasing copper concentration and depended on the flux; a larger recovery was observed at the lower flux condition. In contrast, the amount of recovery in the second stage increased with increasing copper concentration and was independent of the flux. It is considered that the first recovery is related to the annealing out-of-matrix defects and the second one is due to dissolution of copper precipitates. The ?2 of PAS disappeared after the annealing at 350°C, indicating that microvoids decomposed during the annealing.
Author : Todd R. Allen
Publisher : ASTM International
ISBN 13 : 0803134010
Total Pages : 411 pages
Book Rating : 4.8/5 (31 download)
Download or read book Effects of Radiation on Materials written by Todd R. Allen and published by ASTM International. This book was released on 2006 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Narui
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (125 download)
Download or read book Irradiation Hardening and Microstructural Evolution in Fe-Cu Model Alloys written by M. Narui and published by . This book was released on 2004 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Irradiation hardening and microstructural evolution und neutron and electron irradiation have been investigated for pure-Fe and Fe-Cu model alloys. Neutron and electron irradiations were performed in the Japan Material Test Reactor (JMTR) and with using Phodtron electron accelerator at about 290°C and 270±30°C, respectively. Irradiation hardening of pure-Fe and Fe-Cu model alloys is saturated at about 1 x 10-3 dpa in both the neutron and electron irradiation. Irradiation hardening recovered in two temperature ranges. The recovery in the lower temperature range depends on copper concentration and electron irradiation dose, while the recovery at a higher temperature range does not. Recovery behavior of the irradiation hardening suggests indirectly that copper atoms suppress the growth of interstitial clusters. The recovery behavior of positron lifetime does not coincide with that of the hardness, suggesting that the vacancy clusters are not the direct main factor controlling the hardening by matrix damages.
Author : Martin L. Grossbeck
Publisher : ASTM International
ISBN 13 : 0803134770
Total Pages : 767 pages
Book Rating : 4.8/5 (31 download)
Download or read book Effects of Radiation on Materials written by Martin L. Grossbeck and published by ASTM International. This book was released on 2004 with total page 767 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. Yamaguchi
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (125 download)
Download or read book Effect of Nickel on Irradiation Hardening and Microstructure Evolution of Proton Irradiated Fe-Cu Alloys written by S. Yamaguchi and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardness measurements and microstructure examinations of Fe(-C)-Cu-Ni model alloys were performed following 1 MeV proton irradiation below 80°C. Microstructural examinations by transmission electron microscope (TEM) were carried out by means of a cross section method. A band of damage structures, parallel to the irradiated surface, was observed at a depth of 6.5 ? m in agreement with calculation based on the TRIM code. TEM observation revealed that the band consisted of high density of small black spots, which were considered to be interstitial-type dislocation loops. The amount of irradiation hardening increased with increase in copper concentration. An addition of 0.6wt%Ni to Fe-Cu alloys further increased the hardening, although the effect was reduced with increasing copper concentration. Irradiation hardening of pure iron was also significantly increased by the addition of nickel. The size and number density of the spot-like structures in Fe-Cu alloys decreased and increased, respectively, with addition of nickel. Three recovery stages were found in Fe-Cu-Ni alloys during post-irradiation isochronal annealing to 675°C: the stages are at around 150°C, 400°C and 600°C. The first stage was only observed in nickel-containing alloys, while the third stage was only observed in copper-containing alloys. After annealing to 375°C, the density of spot-like structures decreased in Fe-Cu-Ni alloy but increased in Fe-Cu alloy, while for both the size of spots increased.
Author : T. Yoshiie
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (125 download)
Download or read book Neutron Irradiation Rate Dependence of Damage Structures in Fe-Cu Model Alloys written by T. Yoshiie and published by . This book was released on 2000 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fe-Cu model alloys and pure iron were irradiated at 573 K under two different neutron flux conditions (9.4 x 10-8 dpa/s and 1.1 x 10-9 dpa/s) up to about 0.008 dpa. Although defect clusters were not detected by TEM in any specimen, the results of positron lifetime measurement and mechanical property tests clearly indicated an irradiation rate dependence on the microvoid formation and mechanical properties. In positron lifetime measurements, the size of microvoids under low flux irradiation was larger than under high flux irradiation. But the number density was lower than high flux irradiation. In mechanical property testing, more hardening occurred by low flux irradiation. The irradiation rate dependence increased with copper content. These results suggest that the dependence is caused by the precipitation of copper. As copper migrates mainly by the vacancy mechanism, the size and the density of precipitates increase with increasing vacancy migration distance, which becomes longer with a decreasing of the irradiation rate.
Author : S. Suzuki
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)
Download or read book Hardness and Microstructure Changes with Thermal Annealing of Neutron-Irradiated Fe-Cu Alloys written by S. Suzuki and published by . This book was released on 2001 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to investigate mechanisms in recovery of irradiation-induced hardness by thermal annealing for pressure vessel steels containing copper, Fe-0.6 wt.% Cu model alloys irradiated to a dose of 0.0055 dpa at 290°C in JMTR were isochronally annealed at temperatures ranging from 250 to 600°C (?T = 50°C, ?t =15 min). Vickers hardness measurements showed that 70% of the irradiation-induced hardness was eliminated by the annealing. TEM examinations revealed that three kinds of precipitates were formed in the specimens; those are small copper precipitates (disk-shaped, 3-8 nm in diameter), ordered structures of possibly Cu3Fe (L12-type, a0 = ~0.343 nm) and Fe3O4 particles (structure of spinel-type). Copper precipitates slightly increased the number density and size with the post-irradiation annealing below 400 °C, indicating clearly that copper precipitates contributed to hardening, though the degree may be small. The ordered structure was proven by the occurrence of superlattice reflections in selected area diffraction patterns. The post-irradiation annealing reduced the intensities of the superlattice reflections and the zone of Cu3Fe-structure. The ordered structure of Cu3Fe was observed to be destroyed by thermal annealing, resulting in a remarkable decrease in hardness. The hardness during thermal annealing was concluded to be governed by two competitive processes of hardening by the growth of copper precipitates and softening by the order-disorder transformation of Cu3Fe.
Author : M. Suzuki
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (125 download)
Download or read book Microstructure and Hardening in Thermally Aged and Neutron-Irradiated Fe-Cu Model Alloy written by M. Suzuki and published by . This book was released on 2000 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructure of Fe-0.6 wt.% Cu alloys irradiated at 290°C to 0.0055 dpa in the Japan Materials Testing Reactor was examined using a conventional electron microscopy technique to study the precipitation behavior of copper in ?-iron, in addition to those thermally aged at 500°C for 1000 h and unalloyed Fe. Hardness measurements were also carried out. Results showed that there were two kinds of copper precipitates in thermally aged alloys. The first one was an ultrathin untwinned precipitate that increased in thickness with aging, decreasing in size and number density. The second was small with twinning, that grew little until peak hardness. Age hardening, thus, was attributed to ultrathin copper precipitate. Irradiation, which induced a dramatic hardening in the alloys, eliminated the ultrathin precipitates while the small-twinned ones survived. Two (111) patterns appeared on a (110) selected area diffraction pattern of the ?-iron matrix in the irradiated specimens with one (111) pattern analyzed to be due to (110)Cu3Fe reflections (forbidden reflections in fcc crystals) and the other (111) pattern to (220)Fe3O4 reflections. It was concluded that irradiation induced the formation of short range ordered domains of Cu3Fe-superlattice (L12-type) in Fe-Cu alloys, resulting in the dramatic hardening. The precipitation of FeSi was recognized to be enhanced by irradiations in unalloyed iron.
Author : S. Yamaguchi
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)
Download or read book Effects of Neutron Irradiation on Fe-Cu Model Alloys and RPV Steels Probed by Positron Annihilation and Hardness Measurements written by S. Yamaguchi and published by . This book was released on 2000 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: To study the formation of microvoids and Cu precipitates in Fe-Cu mode alloys (0-1.0 wt. % Cu) and A533B reactor pressure vessel (RPV) steel, positron lifetime and Vickers microhardness have been measured after fast neutron irradiation to a fluence of 8.3x1018n/cm2 below 150°C. Long positron lifetimes for the Fe-Cu alloys ranging from 300 to 420 ps and 270 to 350 ps for A533B RPV steels have been observed, which show microvoid formation. The long lifetimes in the Fe-Cu alloys depend on the Cu content and thermal aging at 550°C before irradiation. This fact suggests incorporation of irradiation-induced vacancies at Cu atoms and their precipitates leading to suppression of the microvoid formation. The long lifetime component for the Fe-Cu alloys recovers around 350°C, while that for A533B steel recovers around 300°C. To estimate the microvoid sizes, superimposed-atom model calculations of positron lifetimes in microvoids consisting of 1 (V1) to 66 (V66) vacancies have been performed, respectively. Based on these calculations, the formation and post-irradiation annealing behaviour of microvoids are examined.
Author : Walter Jong-Sheng Yang
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (89 download)
Download or read book The Effects of Neutron Irradiation on the Cyclic Strain Hardening of Cu and Cu(Al) Single Crystals written by Walter Jong-Sheng Yang and published by . This book was released on 1968 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jian Gan
Publisher :
ISBN 13 :
Total Pages : 710 pages
Book Rating : 4.3/5 (91 download)
Download or read book Microstructure Evolution in Proton-irradiated Austenitic Fe-Cr-Ni Alloys Under LWR Core Conditions written by Jian Gan and published by . This book was released on 1999 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.3/5 (126 download)
Download or read book Microstructural Characterization of Irradiated Fe-Cu-Ni-P Model Steels written by and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructure of Fe-Cu-Ni-P model pressure vessel steels after neutron irradiation and thermal aging has been characterized by atom probe field-ion microscopy and augmented by transmission electron microscopy. High densities of small, roughly spherical or disc shaped copper clusters/precipitates were observed in the neutron irradiated alloys that contained copper. Small spherical phosphorus clusters were observed in the irradiated copper-free alloys, and copper phosphides were observed in a high phosphorus Fe-Cu-Ni-P alloy. None of these clusters/precipitates were observed in the thermally aged materials. The increases in the tensile and yield strengths that were observed after neutron irradiation resulted from these clusters and other lattice defects.
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (682 download)
Download or read book Computer Simulation of the Effect of Copper on Defect Production and Damage Evolution in Ferritic Steels written by and published by . This book was released on 1999 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has long been noticed that the effect of Cu solute atoms is important for the microstructural evolution of ferritic pressure vessel steels under neutron irradiation conditions. Despite the low concentration of Cu in steel, Cu precipitates form inside the a-Fe surrounding matrix and by impeding free dislocation motion considerably contribute to the hardening of the material. It has been suggested that Cu-rich clusters and combined Cu solute atoms-defect clusters that may act as initiating structures of further precipitates nucleate during annealing of displacement cascades. In order to assess the importance of the different mechanisms taking place during collision events in the formation and later evolution of these structures, a detailed Molecular Dynamics (MD) analysis of displacement cascades in a Fe-1.3% at. Cu binary alloy has been carried out. Cascade energies ranging from 1 to 20 keV have been simulated at temperatures of 100 and 600 K using the MDCASK code, in which the Ackland-Finnis-Sinclair many-body interatomic potential has been implemented. The behavior of metastable Cu self-interstitial atoms (SIAs) in the form of mixed Fe-Cu features is studied as well as their impact on the resulting defect structures. It is observed that above 300 K generated Cu SIAs undergo recombination with no substantial effect on the after-cascade microstructure while at 100 K Cu SIAs remain sessile and exhibit a considerable binding to interstitial and vacancy clusters, Finally, the effect that the production of vacancies via collision cascades may have on the self-diffusion of Cu solute atoms is quantitatively addressed by means of determining diffusion coefficients for Cu atoms under different microstructural conditions.
Author :
Publisher :
ISBN 13 :
Total Pages : 594 pages
Book Rating : 4.:/5 (319 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : KR. Anderson
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (125 download)
Download or read book Mechanical Property Changes and Microstructures of Dispersion-Strengthened Copper Alloys After Neutron Irradiation at 411, 414, and 529°C written by KR. Anderson and published by . This book was released on 1992 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dispersion-strengthened copper alloys have shown promise for certain high heat flux applications in both near-term and long-term fusion devices. This study examines mechanical properties changes and microstructural evolution in several oxide dispersion-strengthened alloys which were subjected to high levels of irradiation-induced displacement damage. Irradiations were carried out in the fast flux test facility (FFTF) to 34 and 50 dpa at 411 to 414°C and 32dpa at 529°C.
Author :
Publisher :
ISBN 13 :
Total Pages : 764 pages
Book Rating : 4.3/5 (91 download)
Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
