Irradiation induced precipitation in tungsten based, W-Re alloys

Williams, R. K.; Wiffen, F.W.; Bentley, J.; Stiegler, J.O.

doi:10.1007/bf02643781

Cited by 93 publications

(57 citation statements)

References 18 publications

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“…Void formation and irradiation hardening were suppressed in the WRe (HR) alloys. Williams et al 5) suggested that solute Re and self-interstitial atoms tend to form an interstitial solute complex such as a ReW dumbbell. This ReW dumbbell diffuses into the sinks and solute Re enrichment at the sinks occurs.…”

Section: Resultsmentioning

confidence: 99%

“…Re segregation in WRe alloys caused by neutron irradiation was reported in a previous study. 5) In the case of W26%Re (HR), irradiation hardening was probably caused by the formation of irradiation-induced precipitates.…”

Section: Resultsmentioning

confidence: 99%

“…However, fine and dense precipitates such as WRe (sigma phase) and Re 3 W (chi phase) can be observed in the alloy after irradiation of several dpa. 5) Although the solute Re improves the mechanical properties of W, 1416) the irradiation-induced precipitates cause severe irradiation hardening and embrittlement. 9,10,13) The mechanical properties of W also change depending on the fabrication process, including the subsequent heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Re Content and Fabrication Process on Microstructural Changes and Hardening in Neutron Irradiated Tungsten

et al. 2012

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The effects of the material fabrication process and rhenium (Re) content on the irradiation-induced changes in the microstructure and hardness of pure tungsten (W) and WRe alloys were investigated. Neutron irradiation of pure W and WRe alloys (Re concentration 326%) was carried out in the experimental fast reactor JOYO. The irradiation conditions were 0.44 displacement per atom (dpa) at 531°C and 0.47 dpa at 583°C for pure W and WRe alloys, respectively. After irradiation, microstructural observations using a transmission electron microscope (TEM) and Vickers microhardness tests were performed.Voids and dislocation loops were observed in both pure W and WRe alloys after irradiation. The number density of voids in pure W was higher than that in W3%Re, W5%Re and W10%Re. Only in the case of W26%Re irradiated to 0.47 dpa at 583°C were there no voids observed, but irradiation-induced fine precipitates and a few dislocation loops were observed. The irradiation hardening of pure W was greater than that of the WRe alloys. It was considered that irradiation hardening of pure W was caused mainly by the higher number density of voids. The addition of Re suppressed void formation and irradiation hardening of the WRe alloys. Irradiation hardening of W was also suppressed in hot-rolled W compared with arc-melted as-cast W.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Re Content and Fabrication Process on Microstructural Changes and Hardening in Neutron Irradiated Tungsten

et al. 2012

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“…For instance, the addition of Re to W lowers the DBTT and enhances its ductility and mechanical characteristics at high temperatures. However, W-Re alloys have been excluded for fusion applications because they suffer severe embrittlement induced by neutron irradiation due to the Re transmutation [6][7][8]. The disper-sion of oxide particles increases the RCT and the strength at high temperature via grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Development of oxide dispersion strengthened W alloys produced by hot isostatic pressing

Martínez

Savoini

Monge

et al. 2011

Fusion Engineering and Design

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a b s t r a c tA powder metallurgy technique has been developed to produce oxide strengthened W-Ti and W-V alloys using elemental powders and nanosized powders of La 2 O 3 or Y 2 O 3 as starting materials. The alloys consolidated by hot isostatic pressing resulted in high-density materials having an ultrafine-grained structure and microhardness values in the range 7-13 GPa. Atom force microscopy studies show a topographic relief in the Ti and V pools that appear in the consolidated alloys. This relief is attributed to the heterogeneous nucleation of martensite plates. The preliminary transmission electron microscopy studies have revealed that a dispersion of nanoparticles can be induced in these alloys produced via the present technique.

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“…5,6) In terms of microstructural evolution, it has been reported that phase precipitates (Re 3 W) were formed in W-xRe alloys after 0.5-0.7 dpa irradiation at 600-1500 C without void formation, and the bulk properties were affected by this precipitation. 7) Heavy neutron irradiation induced large irradiation hardening in W26Re alloy by irradiation-induced precipitation. 8) However, even though rhenium and osmium are the main transmutation elements from tungsten, there are very few reports concerning irradiation effects on W-xRe and W-xRe-yOs alloys.…”

mentioning

confidence: 99%

Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys

et al. 2008

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Tungsten-based model alloys were fabricated to simulate compositional changes by neutron irradiation, performed in the JOYO fast test reactor. The irradiation damage range was 0.17-1.54 dpa and irradiation temperatures were 400, 500 and 750 C. After irradiation, microstructural observations and electrical resistivity measurements were carried out. A number of precipitates were observed after 1.54 dpa irradiation. Rhenium and osmium were precipitated by irradiation, which suppressed the formation of dislocation loops and voids. Structures induced by irradiation were not observed so much after 0.17 dpa irradiation. Electrical resistivity measurements showed that the effects of osmium on the electrical resistivity, related to impurity solution content, were larger than that of rhenium. Measurements of electrical resistivity of ternary alloys showed that the precipitation behavior was similar to that in binary alloys.

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Irradiation induced precipitation in tungsten based, W-Re alloys

Cited by 93 publications

References 18 publications

Effects of Re Content and Fabrication Process on Microstructural Changes and Hardening in Neutron Irradiated Tungsten

Effects of Re Content and Fabrication Process on Microstructural Changes and Hardening in Neutron Irradiated Tungsten

Development of oxide dispersion strengthened W alloys produced by hot isostatic pressing

Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys

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