Mechanical properties of Y2Ti2O7

He, Lingfeng; Shirahata, Jun; Nakayama, Tadachika; Suzuki, Tsuneo; Suematsu, Hisayuki; Ihara, Ikuo; Bao, Yiwang; Komatsu, Takayuki; Niihara, Koichi

doi:10.1016/j.scriptamat.2010.11.042

Cited by 45 publications

(17 citation statements)

References 26 publications

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“…The calculated Young's modulus and Poisson's ratio for bulk Y 2 Ti 2 O 7 at RT are 260 GPa and 0.25, respectively, which match well with the experimental values of 253-265 GPa (0.25-0.27) in Ref. [36]. The values (397 GPa (0.35)) of TiN (222) reflection at RT are similar to the results (407 GPa (0.32)) that are also based on first principal from Zhang et al [37] for TiN (222) reflection.…”

Section: Macroscopic Stress-strain and Load Partitioningsupporting

confidence: 86%

Load partitioning between ferrite/martensite and dispersed nanoparticles of a 9Cr ferritic/martensitic (F/M) ODS steel at high temperatures

Zhang

Miao

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tIn this study, a high-energy synchrotron radiation X-ray technique was used to investigate the tensile deformation processes of a 9Cr-ODS ferritic/martensitic (F/M) steel at different temperatures. Two minor phases within the 9Cr-ODS F/M steel matrix were identified as Y 2 Ti 2 O 7 and TiN by the high-energy X-ray diffraction, and confirmed by the analysis using energy dispersive X-ray spectroscopy (EDS) of scanning transmission electron microscope (STEM). The lattice strains of the matrix and particles were measured through the entire tensile deformation process. During the tensile tests, the lattice strains of the ferrite/ martensite and the particles (TiN and Y 2 Ti 2 O 7 ) showed a strong temperature dependence, decreasing with increasing temperature. Analysis of the internal stress at three temperatures showed that the load partitioning between the ferrite/martensite and the particles (TiN and Y 2 Ti 2 O 7 ) was initiated during sample yielding and reached to a peak during sample necking. At three studied temperatures, the internal stress of minor phases (Y 2 Ti 2 O 7 and TiN) was about 2 times that of F/M matrix at yielding position, while the internal stress of Y 2 Ti 2 O 7 and TiN reached about 4.5-6 times and 3-3.5 times that of the F/M matrix at necking position, respectively. It indicates that the strengthening of the matrix is due to minor phases (Y 2 Ti 2 O 7 and TiN), especially Y 2 Ti 2 O 7 particles. Although the internal stresses of all phases decreased with increasing temperature from RT to 600°C, the ratio of internal stresses of each phase at necking position stayed in a stable range (internal stresses of Y 2 Ti 2 O 7 and TiN were about 4.5-6 times and 3-3.5 times of that of F/M matrix, respectively). The difference between internal stress of the F/M matrix and the applied stress at 600°C is slightly lower than those at RT and 300°C, indicating that the nanoparticles still have good strengthening effect at 600°C.

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Section: Macroscopic Stress-strain and Load Partitioningsupporting

confidence: 86%

Load partitioning between ferrite/martensite and dispersed nanoparticles of a 9Cr ferritic/martensitic (F/M) ODS steel at high temperatures

Zhang

Miao

et al. 2015

Materials Science and Engineering: A

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“…The dispersion particles have been observed to impede the dislocation motion (Figure d). Because the shear modulus of the dispersion particles (e.g., G = 101 GPa for Y 2 Ti 2 O 7 ) exceeds that of the 304 austenitic steel matrix ( G = 74–81 GPa) and most dispersion particles form an incoherent interface with the matrix, dispersion particles may be bypassed by dislocations via the Orowan mechanism at room temperature …”

Section: Discussionmentioning

confidence: 99%

Effect of Laser Shock Peening on the Microstructures and Properties of Oxide‐Dispersion‐Strengthened Austenitic Steels

et al. 2017

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Oxide-dispersion-strengthened (ODS) austenitic steels are promising materials for next-generation fossil and nuclear energy systems. In this study, laser shock peening (LSP) has been applied to ODS 304 austenitic steels, during which a high density of dislocations, stacking faults, and deformation twins are generated in the near surface of the material due to the interaction of laserdriven shock waves and the austenitic steel matrix. The dispersion particles impede the propagation of dislocations. The compressive residual stress generated by LSP increases with successive LSP scans and decreases along the depth, with a maximum value of À369 MPa. The hardness on the surface can be improved by 12% using LSP. In situ transmission electron microscopy (TEM) irradiation studies reveal that dislocations and incoherent twin boundaries induced by LSP serve as effective sinks to annihilate irradiation defects. These findings suggest that LSP can improve the mechanical properties and irradiation resistance of ODS austenitic steels in nuclear reactor environments.

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“…For grain boundary stabilization, coherent dispersoids are more effective than incoherent dispersoids [60,61]. For dislocation pinning, incoherent Y 2 Ti 2 O 7 dispersoids can be less attractive to dislocations due to a repulsive contribution caused by the oxide's large elastic modulus when compared to the Fe-Cr matrix [57,58,62,63].…”

Section: Discussionmentioning

confidence: 99%

Temperature dependent dispersoid stability in ion-irradiated ferritic-martensitic dual-phase oxide-dispersion-strengthened alloy: Coherent interfaces vs. incoherent interfaces

et al. 2016

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a b s t r a c tIn this study, the microstructure of a 12Cr ferritic-martensitic oxide-dispersion-strengthened (ODS) alloy is studied before and after Fe ion irradiation up to 200 peak displacements per atom (dpa). Irradiation temperature ranges from 325 to 625 C. Before irradiation, both coherent and incoherent dispersoids exist in the matrix. In response to irradiation, the mean sizes of dispersoids in both the ferrite and tempered martensite phases change to equilibrium values that increase with irradiation temperature. The evolution of dispersoids under irradiation is explained by a competition between athermalradiation-driven shrinkage and thermal-diffusion-driven growth, with interface coherency affecting the growth mechanism. However, each coherency type exhibits different evolution behavior under irradiation. Coherent dispersoids, regardless of their initial size, change toward an equilibrium size at each temperature tested. On the other hand, incoherent dispersoids are destroyed at lower test temperatures but survive while shrinking in size at higher temperatures. This difference in behavior can be explained by the lower interfacial energy of coherent dispersoids in comparison with incoherent dispersoids. This study sheds light on the roles of interface configurations in maintaining dispersoid integrity under irradiation.

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Mechanical properties of Y2Ti2O7

Cited by 45 publications

References 26 publications

Load partitioning between ferrite/martensite and dispersed nanoparticles of a 9Cr ferritic/martensitic (F/M) ODS steel at high temperatures

Load partitioning between ferrite/martensite and dispersed nanoparticles of a 9Cr ferritic/martensitic (F/M) ODS steel at high temperatures

Effect of Laser Shock Peening on the Microstructures and Properties of Oxide‐Dispersion‐Strengthened Austenitic Steels

Temperature dependent dispersoid stability in ion-irradiated ferritic-martensitic dual-phase oxide-dispersion-strengthened alloy: Coherent interfaces vs. incoherent interfaces

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