Y2O3 evolution and dispersion refinement in Co-base ODS alloys

Zhang, Lin; Ukai, Shigeharu; Hoshino, Takao; Hayashi, Shigenari; Qu, Xuanhui

doi:10.1016/j.actamat.2009.04.033

Cited by 115 publications

(53 citation statements)

References 31 publications

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“…The results are shown in Fig. 8 12) and results in a lower interfacial energy. Thus, the small particles would tend to precipitate homogeneously, impeding the growth of small particles by Ostwald Ripening.…”

Section: Hardness Testmentioning

confidence: 88%

Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y2O3 Alloys

et al. 2010

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The effect of adding minor elements, such as Ti, Mg, Zr, Ca or Hf, on the size of oxide particles was investigated in Ni-based ODS alloy, Ni-0.5 mass%Al-1 mass%Y 2 O 3 . Among these elements, Hf is the most effective at refining the oxide particles, particularly at a concentration of 0.8 mass% Hf, as verified by TEM observation and hardness measurement. X-ray diffraction measurements indicate that the formation of Y 2 Hf 2 O 7 is responsible for the refinement of oxide particles. The Hf is also effective for a commercial superalloy of PM1000.

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Section: Hardness Testmentioning

confidence: 88%

Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y2O3 Alloys

et al. 2010

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“…4 shows the oxide particles observed in Nb−15Al−30Re−1.7Y 2 O 3 . From the selected area diffraction patterns and the TEM-EDS analyses, it was revealed that major oxide particle is YAlO 3 Fig.5. However, Nishi and Shaffer [4] reported that YAH is the dominant oxide particles observed in Ni-Al base ODS alloys; this compound could be meta-stable state.…”

Section: Resultsmentioning

confidence: 99%

“…The heavy plastic deformation introduced by MA gives adequate hardening of the powders and the reduced grain size to 10 nm within MA period of 10 h. Nb solid solution and Nb 3 Al coexist in the matrix of the consolidated alloys, and the oxide particles are coarsened in size of 50 nm to 200 nm by the formation of hexagonal type of YAlO 3 (YAH). The compression ductility is maintained more than 20 % at 1200 ºC.…”

Section: Discussionmentioning

confidence: 99%

“…We have been developing the oxide dispersion strengthened (ODS) alloys for Fe-base [1], Ni-base [2] and Co-base [3] alloys. This technique is applied to develop the Nb-Al base ODS alloys, where high-temperature strengthening can be achieved by the dispersed Y 2 O 3 particles and oxidation resistance can be led by an alumina scale formation on the alloy surface.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization of Nb-Al Base ODS Alloys

Ukai

Minami

Hayashi

et al. 2010

MSF

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“…The addition of a small amount of Ti has been reported to be responsible for refinement of the dispersoid size [7][8][9] through the formation of YTi complex oxide, which in turn significantly improves creep rupture strength. It has been reported in the literature [10] that these Y-Ti complex oxide particles are exceptionally stable under irradiation environments.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress State in Oxide Dispersive Steel due to Irradiation by Swift Heavy Ions

Углов

Skuratov

Ulyanenkova

et al. 2014

AMR

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Abstract. Oxide dispersive steel is a promising material for next nuclear reactors generation. Performance of this material in nuclear reactor can be modeled by means of irradiation by swift Bi ions, which are typical nuclear fusion products. Radiation damage results in microstructure alternation leading to formation of micro and macro stresses that influence the material performance. The residual stress state of ferrite matrix of the steel is investigated by XRD methodic and dependence on the irradiation dose is analyzed. IntroductionBeing considered as promising candidate materials for future reactors, oxide dispersion strengthened (ODS) steels are subject of extensive irradiation testing with various radiation sources. The dispersion of nano-sized oxides associated with the ferritic matrix confers very good creep strength at high temperature and resistance to radiation swelling at high dose [1][2][3]. The ferritic ODS steels have superior void swelling resistance by virtue of the inherently favorable interaction between point defects. Besides, the dispersoids also act as trapping sites for irradiation induced point defects thereby enhancing the swelling resistance. In addition, the dispersed oxide particles impede the movement of dislocations providing the required high temperature creep resistance, which is otherwise low in ferritic steels.Energetic ions can be used to investigate the effects of neutron irradiation in reactor components. Although the damage state depends on the particle type and damage rate, simulations with ion irradiations yield answer on basic mechanisms with the considerable advantage to enable easy variations of irradiation parameters without residual activity of the samples.In the last years, there have been considerable research efforts on development of ODS steels [4][5][6]. These research efforts encompass synthesis of the alloy by powder metallurgical processing methods such as mechanical alloying followed by consolidation employing hipping, forging or extrusion at high temperatures.The addition of a small amount of Ti has been reported to be responsible for refinement of the dispersoid size [7][8][9] through the formation of YTi complex oxide, which in turn significantly improves creep rupture strength. It has been reported in the literature [10] that these Y-Ti complex oxide particles are exceptionally stable under irradiation environments.In this paper we present the results of residual stress study of Fe-15Cr-2W-0.2Ti-0.35Y 2 O 3 ODS (KP123) steel irradiated with 700 MeV Bi ions.

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Y2O3 evolution and dispersion refinement in Co-base ODS alloys

Cited by 115 publications

References 31 publications

Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y<SUB>2</SUB>O<SUB>3</SUB> Alloys

Refinement of Oxide Particles by Addition of Hf in Ni-0.5 mass%Al-1 mass%Y<SUB>2</SUB>O<SUB>3</SUB> Alloys

Microstructural Characterization of Nb-Al Base ODS Alloys

Residual Stress State in Oxide Dispersive Steel due to Irradiation by Swift Heavy Ions

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