Coupling effect of intergranular and intragranular particles on ductile fracture of Mo–La2O3 alloys

Cheng, P.M.; Zhang, G.J.; Zhang, J.Y.; Liu, G.; Sun, Jun

doi:10.1016/j.msea.2015.05.032

Cited by 92 publications

(9 citation statements)

References 36 publications

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“…Otherwise, refractory elements need to be considered for in-core applications, including ATF. The spectrum of alloys is quite wide [96,97,329], for both fission and fusion [330] and especially considered for space nuclear applications [331], often combining elements, either in solid solution [96,97,329], or in layers [332,333]: molybdenum alloys [102,334,335] (U-Mo alloys are also considered as proliferation-resistant fuel [336]. ), niobium alloys [331,337], vanadium alloys [97,333,[338][339][340] and tungsten alloys [332,341,342], the two latter especially for fusion, and tungsten exclusively for it [329,342].…”

Section: Annex 3-pathways To Nuclear Materials Improvement For Next G...mentioning

confidence: 99%

“…However, when used for structural purposes, these materials are penalised by significant brittleness. This is why refractory materials for structural components, not only ceramics as above, but also metallic [335,341], are generally considered in the form of composites, containing fibres or other reinforcements that provide some type of pseudoductile mechanical behaviour. Other possibilities may be layered materials [332,333,347], or nanocomposites [101,347].…”

Section: Annex 3-pathways To Nuclear Materials Improvement For Next G...mentioning

confidence: 99%

See 1 more Smart Citation

Materials for Sustainable Nuclear Energy: A European Strategic Research and Innovation Agenda for All Reactor Generations

Malerba

Mazouzi²,

Bertolus

et al. 2022

Energies

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Nuclear energy is presently the single major low-carbon electricity source in Europe and is overall expected to maintain (perhaps eventually even increase) its current installed power from now to 2045. Long-term operation (LTO) is a reality in essentially all nuclear European countries, even when planning to phase out. New builds are planned. Moreover, several European countries, including non-nuclear or phasing out ones, have interests in next generation nuclear systems. In this framework, materials and material science play a crucial role towards safer, more efficient, more economical and overall more sustainable nuclear energy. This paper proposes a research agenda that combines modern digital technologies with materials science practices to pursue a change of paradigm that promotes innovation, equally serving the different nuclear energy interests and positions throughout Europe. This paper chooses to overview structural and fuel materials used in current generation reactors, as well as their wider spectrum for next generation reactors, summarising the relevant issues. Next, it describes the materials science approaches that are common to any nuclear materials (including classes that are not addressed here, such as concrete, polymers and functional materials), identifying for each of them a research agenda goal. It is concluded that among these goals are the development of structured materials qualification test-beds and materials acceleration platforms (MAPs) for materials that operate under harsh conditions. Another goal is the development of multi-parameter-based approaches for materials health monitoring based on different non-destructive examination and testing (NDE&T) techniques. Hybrid models that suitably combine physics-based and data-driven approaches for materials behaviour prediction can valuably support these developments, together with the creation and population of a centralised, “smart” database for nuclear materials.

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Section: Annex 3-pathways To Nuclear Materials Improvement For Next G...mentioning

confidence: 99%

Section: Annex 3-pathways To Nuclear Materials Improvement For Next G...mentioning

confidence: 99%

Materials for Sustainable Nuclear Energy: A European Strategic Research and Innovation Agenda for All Reactor Generations

Malerba

Mazouzi²,

Bertolus

et al. 2022

Energies

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“…As demonstrated in Fig. S 9 , the Mo-La 2 O 3 alloy treated with rotary-swaging also has better strength and elongation than that treated by rolling 14 . We further directly compared the properties of the Mo-La 2 O 3 alloy processed by rotary-swaging to other previously reported high-performance Mo alloys containing different oxides and grain sizes.…”

Section: Resultsmentioning

confidence: 86%

The origin of exceptionally large ductility in molybdenum alloys dispersed with irregular-shaped La2O3 nano-particles

Chen,

Fang,

Cheng

et al. 2024

Nat Commun

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Molybdenum and its alloys are known for their superior strength among body-centered cubic materials. However, their widespread application is hindered by a significant decrease in ductility at lower temperatures. In this study, we demonstrate the achievement of exceptional ductility in a Mo alloy containing rare-earth La2O3 nanoparticles through rotary-swaging, a rarity in Mo-based materials. Our analysis reveals that the large ductility originates from substantial variations in the electronic density of states, a characteristic intrinsic to rare-earth elements. This characteristic can accelerate the generation of oxygen vacancies, facilitating the amorphization of the oxide-matrix interface. This process promotes vacancy absorption and modification of dislocation configurations. Furthermore, by inducing irregular shapes in the La2O3 nanoparticles through rotary-swaging, incoming dislocations interact with them, creating multiple dislocation sources near the interface. These dislocation sources act as potent initiators at even reduced temperatures, fostering diverse dislocation types and intricate networks, ultimately enhancing dislocation plasticity.

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“…Therefore, decreasing the DBTT to simultaneously improve both ductility and strength of Mo alloy at room temperature has become a well-known major goal over recent decades [5,6]. As previously reported [2,7,8,9], the addition of rare-earth oxides, such as La 2 O 3 , Y 2 O 3 , and Gd 2 O 3 into Mo alloys via various doping routes to form rare-earth oxide doped Mo alloys can obviously decrease DBTT. Thus, the rare-earth oxide doped Mo alloys have high toughness and strength at both room and high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, previous studies about the doping content of La 2 O 3 indicated that the doping content of La 2 O 3 exceeds 2.0 wt.%, which cannot improve the properties of molybdenum alloys [2,16]. Cheng et al [8] studied the properties of Mo alloy with different doping contents of La 2 O 3 , and the results showed that the Mo alloy with 0.5–1.0 wt.% La 2 O 3 doping simultaneously achieve high strength and great elongation.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of La2O3 Uniformly Doped Mo Nanopowders by Solution Combustion Synthesis Followed by Reduction under Hydrogen

Qin

Zhang

et al. 2018

Materials

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This work reports the preparation of La2O3 uniformly doped Mo nanopowders with the particle sizes of 40–70 nm by solution combustion synthesis and subsequent hydrogen reduction (SCSHR). To reach this aim, the foam-like MoO2 precursors (20–40 nm in size) with different amounts of La2O3 were first synthesized by a solution combustion synthesis method. Next, these precursors were used to prepare La2O3 doped Mo nanopowders through hydrogen reduction. Thus, the content of La2O3 used for doping can be accurately controlled via the SCSHR route to obtain the desired loading degree. The successful doping of La2O3 into Mo nanopowders with uniform distribution were proved by X-ray photon spectroscopy and transmission electron microscopy. The preservation of the original morphology and size of the MoO2 precursor by the La2O3 doped Mo nanopowders was attributed to the pseudomorphic transport mechanism occurring at 600 °C. As shown by X-ray diffraction, the formation of Mo2C impurity, which usually occurs in the direct H2 reduction process, can be avoided by using the Ar calcination-H2 reduction process, when residual carbon is removed by the carbothermal reaction during Ar calcination at 500 °C.

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Coupling effect of intergranular and intragranular particles on ductile fracture of Mo–La2O3 alloys

Cited by 92 publications

References 36 publications

Materials for Sustainable Nuclear Energy: A European Strategic Research and Innovation Agenda for All Reactor Generations

Materials for Sustainable Nuclear Energy: A European Strategic Research and Innovation Agenda for All Reactor Generations

The origin of exceptionally large ductility in molybdenum alloys dispersed with irregular-shaped La2O3 nano-particles

Fabrication of La2O3 Uniformly Doped Mo Nanopowders by Solution Combustion Synthesis Followed by Reduction under Hydrogen

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