Secondary phases strengthening-toughening effects in the Mo–TiC–La2O3 alloys

Hu, Bo-Liang; Han, Jia-Yu; Ge, Songwei; Hua, Xing-Jiang; Li, Shilei; Xing, Hai-Rui; Wang, Kuaishe; Hu, Ping; Fu, Jing; Zhang, Wen; Volinsky, Alex A.; Марченко, Екатерина

doi:10.1016/j.msea.2021.142271

Cited by 22 publications

(9 citation statements)

References 9 publications

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Section: Mainmentioning

confidence: 99%

“…Prior researches hypothesize that rare earth oxides not only promote grain nucleation, but the oxygen vacancies at the surface may adsorb detrimental impurities such as O, N atoms et. al., thereby reducing grain boundary-induced crack nucleation 15,19 . However, this hypothesis lacks empirical evidence and fails to account for the increased intergranular dislocation activity.Recently, we realize that rare earth elements, owing to the strong correlation between electrons in forbitals and their multivalence nature, exhibit a range of exotic electronic states 20 .…”

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confidence: 99%

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The origin of exceptionally large ductility in Molybdenum Alloys dispersed with Irregular-Shaped La2O3 Nano-Particles

Yu,

Chen,

Fang

et al. 2024

Preprint

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Molybdenum and its alloys typically exhibit superior strength compared with other body centered cubic materials, while the pronounced decrease in ductility at lower temperatures often imped their widespread applications. In this study, we demonstrate the attainment of extraordinary ductility by utilizing rotary-swaging to process a Mo alloy containing rare earth La2O3 nanoparticles —a rarity within the domain of Mo-based materials. Our atomic structure analysis elucidates that the exceptionally large ductility is originated from the substantial variations in electronic density of states, a characteristic intrinsic to rare-earth elements, which can expedite the generation of oxygen vacancies. This, in turn, facilitates the amorphization of the oxide-matrix interface under precise processing control, which then exhibits a propensity for vacancy absorption and modification of dislocation configurations. Furthermore, by imparting irregular shapes to the La2O3 nanoparticles through rotary-swaging, we succeeded in engendering multiple dislocation sources in the vicinity of the interface as incoming dislocations interact with these La2O3 nanoparticles. The newly generated dislocation sources persistently operate as potent dislocation initiators under applied stress even at reduced temperatures, resulting in the formation of diverse dislocation types and intricate dislocation networks and ultimately leading to superior dislocation plasticity.

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Section: Mainmentioning

confidence: 99%

mentioning

confidence: 99%

The origin of exceptionally large ductility in Molybdenum Alloys dispersed with Irregular-Shaped La2O3 Nano-Particles

Yu,

Chen,

Fang

et al. 2024

Preprint

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“…Although their presence may not significantly contribute to weight, value, or volume, it is often indispensable for optimal material performance. In less-ductile BCC structured metals and alloys, adding rare-earth oxides like CeO 2 12 , La 2 O 3 13 – 15 , and Y 2 O 3 16 – 18 showed promise in simultaneously enhancing strength and ductility. Prior researchers hypothesize that rare-earth oxides not only promote grain nucleation, but the oxygen vacancies at the surface adsorb detrimental impurities such as O, N atoms et.…”

Section: Introductionmentioning

confidence: 99%

“…Prior researchers hypothesize that rare-earth oxides not only promote grain nucleation, but the oxygen vacancies at the surface adsorb detrimental impurities such as O, N atoms et. al., thereby reducing grain boundary-induced crack nucleation 15 , 19 . However, this hypothesis lacks empirical evidence and fails to account for the increased intergranular dislocation activity.…”

Section: Introductionmentioning

confidence: 99%

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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“…Non-toxic yttrium oxide (Y 2 O 3 ) has several advantages, which can be incorporated into the Ag matrix to form Ag/Y 2 O 3 electrical contacts. Rare earth elements can promote recrystallization, refine the grains, and strengthen the matrix [ 14 , 15 ]. Y element’s high chemical activity [ 16 ] could help silver resist corrosion and maintain high electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Continuous Network Structure Greatly Improved the Anti-Arc-Erosion Capability of Ag/Y2O3 Electrical Contacts

et al. 2022

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Ag/Y2O3 has excellent potential to replace Ag/CdO as the environmentally friendly electrical contact material. Using spherical Y2O3 as the starting material, Ag/Y2O3 contacts with a quasi-continuous network structure were successfully fabricated by a low-energy ball milling treatment. The mean size of Y2O3 used ranged from 243 to 980 nm. Due to the differences in the size of Y2O3, Ag/Y2O3 contacts had different primitive microstructures, thereby exhibiting distinctive anti-arc-erosion capabilities. Ag/Y2O3 contact prepared using 243 nm Y2O3 showed the best anti-arc-erosion capability and the most outstanding electrical performance measures, such as low contact resistance, less mass transfer, and no failure up to 105 cycle times. The quasi-continuous network structure formed in the fine-scare was responsible for the excellent electrical performance. The short distance between Y2O3 particles in the network promoted the cathode arc motion, and thus alleviated the localized erosion. The results obtained herein may inspire further attempts to design electrical contacts rationally.

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Secondary phases strengthening-toughening effects in the Mo–TiC–La2O3 alloys

Cited by 22 publications

References 9 publications

The origin of exceptionally large ductility in Molybdenum Alloys dispersed with Irregular-Shaped La2O3 Nano-Particles

The origin of exceptionally large ductility in Molybdenum Alloys dispersed with Irregular-Shaped La2O3 Nano-Particles

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

Quasi-Continuous Network Structure Greatly Improved the Anti-Arc-Erosion Capability of Ag/Y2O3 Electrical Contacts

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