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Mechanical properties and microstructural change of W-Y2O3 alloy under helium irradiation.

Tan X, Luo L, Chen H, Zhu X, Zan X, Luo G, Chen J, Li P, Cheng J, Liu D, Wu Y - Sci Rep (2015)

Bottom Line: A wet-chemical method combined with spark plasma sintering was used to prepare a W-Y2O3 alloy.High-temperature tensile tests and nano-indentation microhardness tests were used to characterize the mechanical properties of the alloy.The transformation mechanism predicted by the atomic lattice model was consistent with the available experimental observations.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China.

ABSTRACT
A wet-chemical method combined with spark plasma sintering was used to prepare a W-Y2O3 alloy. High-temperature tensile tests and nano-indentation microhardness tests were used to characterize the mechanical properties of the alloy. After He-ion irradiation, fuzz and He bubbles were observed on the irradiated surface. The irradiation embrittlement was reflected by the crack indentations formed during the microhardness tests. A phase transformation from α-W to γ-W was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Polycrystallization and amorphization were also observed in the irradiation damage layer. The W materials tended to exhibit lattice distortion, amorphization, polycrystallization and phase transformation under He-ion irradiation. The transformation mechanism predicted by the atomic lattice model was consistent with the available experimental observations. These findings clarify the mechanism of the structural transition of W under ion irradiation and provide a clue for identifying materials with greater irradiation resistance.

No MeSH data available.


Related in: MedlinePlus

Typical HRTEM images.(a) different degrees of distortion of the crystal lattice produced by non-uniform irradiation intensity; (b) HRTEM image of the polycrystalline structure; (c) HRTEM image of the amorphous structure.
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f11: Typical HRTEM images.(a) different degrees of distortion of the crystal lattice produced by non-uniform irradiation intensity; (b) HRTEM image of the polycrystalline structure; (c) HRTEM image of the amorphous structure.

Mentions: Figure 11 shows some typical HRTEM images of the irradiation-damaged area. In Fig. 11a, part of the crystal lattice retains its original structure and most lattices have been distorted under He-ion irradiation. Different irradiation intensities could lead to different degrees of lattice distortion. As shown in Fig. 11b, a polycrystalline structure with a scattering ring indicates that polycrystallization occurred in the irradiated samples. Figure 11c shows an amorphous structure, and the SAED patterns of the structures in the HRTEM images are presented in the insets. A halo or ring is observed in the SAED patterns, indicating that amorphization occurred in the irradiated samples. From the empirical potential, different degrees of distortion are caused by non-uniform intensity, and non-uniform irradiation intensity is reflected in the He particles that bombard the material on considerably smaller scales. In general, with increasing irradiation intensity and increasing structural change from a normal lattice to a distorted lattice, polycrystalline and amorphous structures are observed. The amorphous structures could produce relatively high-intensity irradiation positions.


Mechanical properties and microstructural change of W-Y2O3 alloy under helium irradiation.

Tan X, Luo L, Chen H, Zhu X, Zan X, Luo G, Chen J, Li P, Cheng J, Liu D, Wu Y - Sci Rep (2015)

Typical HRTEM images.(a) different degrees of distortion of the crystal lattice produced by non-uniform irradiation intensity; (b) HRTEM image of the polycrystalline structure; (c) HRTEM image of the amorphous structure.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4521205&req=5

f11: Typical HRTEM images.(a) different degrees of distortion of the crystal lattice produced by non-uniform irradiation intensity; (b) HRTEM image of the polycrystalline structure; (c) HRTEM image of the amorphous structure.
Mentions: Figure 11 shows some typical HRTEM images of the irradiation-damaged area. In Fig. 11a, part of the crystal lattice retains its original structure and most lattices have been distorted under He-ion irradiation. Different irradiation intensities could lead to different degrees of lattice distortion. As shown in Fig. 11b, a polycrystalline structure with a scattering ring indicates that polycrystallization occurred in the irradiated samples. Figure 11c shows an amorphous structure, and the SAED patterns of the structures in the HRTEM images are presented in the insets. A halo or ring is observed in the SAED patterns, indicating that amorphization occurred in the irradiated samples. From the empirical potential, different degrees of distortion are caused by non-uniform intensity, and non-uniform irradiation intensity is reflected in the He particles that bombard the material on considerably smaller scales. In general, with increasing irradiation intensity and increasing structural change from a normal lattice to a distorted lattice, polycrystalline and amorphous structures are observed. The amorphous structures could produce relatively high-intensity irradiation positions.

Bottom Line: A wet-chemical method combined with spark plasma sintering was used to prepare a W-Y2O3 alloy.High-temperature tensile tests and nano-indentation microhardness tests were used to characterize the mechanical properties of the alloy.The transformation mechanism predicted by the atomic lattice model was consistent with the available experimental observations.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China.

ABSTRACT
A wet-chemical method combined with spark plasma sintering was used to prepare a W-Y2O3 alloy. High-temperature tensile tests and nano-indentation microhardness tests were used to characterize the mechanical properties of the alloy. After He-ion irradiation, fuzz and He bubbles were observed on the irradiated surface. The irradiation embrittlement was reflected by the crack indentations formed during the microhardness tests. A phase transformation from α-W to γ-W was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Polycrystallization and amorphization were also observed in the irradiation damage layer. The W materials tended to exhibit lattice distortion, amorphization, polycrystallization and phase transformation under He-ion irradiation. The transformation mechanism predicted by the atomic lattice model was consistent with the available experimental observations. These findings clarify the mechanism of the structural transition of W under ion irradiation and provide a clue for identifying materials with greater irradiation resistance.

No MeSH data available.


Related in: MedlinePlus