Contrasting Irradiation Behavior of Dual Phases in Ti-6Al-4V Alloy at Low-Temperature Due to Omega-phase Precursors in Beta-phase Matrix
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914933290041344 |
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| author | Ishida, Taku Kano, Sho Wakai, Eiichi Shibayama, Tamaki Makimura, Shunsuke Abe, Hiroaki |
| author_facet | Ishida, Taku Kano, Sho Wakai, Eiichi Shibayama, Tamaki Makimura, Shunsuke Abe, Hiroaki |
| contents | Aiming to simulate the radiation damage effect on a dual alpha+beta phase Ti-6Al-4V alloy utilized as high-intensity accelerator beam window material, a series of irradiation experiments were conducted with a 2.8 MeV-Fe^2+ ion beam in several dpa regions at room temperature. The nano-indentation hardness increased steeply at 1 dpa and unchanged up to 10 dpa, due to the saturation of defect clusters and tangled dislocations in the dominant alpha-phase matrix with a size of 2~3 nm and a density of about 1x10^23 m^-3. In contrast in the intergranular beta-phase, larger loops of 20~30 nm diameter were observed with much less density of about 5x10^20 m^-3. The diffraction pattern showed rectilinear diffuse streaks between the beta-phase reflections, corresponding to the omega-phase precursor, without dose dependency in its intensity. FFT/I-FFT analysis of the HREM revealed a sub-nanometer-sized lattice disorder with local fluctuations, not discrete but continuous, and homogeneously distributed within the matrix beta-phase stably against the irradiation. The significantly low dislocation density and the absence of phase transformation in the beta-phase matrix could be attributed either to the strong sink effect expected for this distinctive sub-nanometer-sized homogeneous lattice disorder or to the anomalous point defect recombination induced by the high mobility of vacancies, both of which are originated from the metastable omega-phase precursors specifically formed in the beta(BCC) phase of group-4 transition metals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_00517 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Contrasting Irradiation Behavior of Dual Phases in Ti-6Al-4V Alloy at Low-Temperature Due to Omega-phase Precursors in Beta-phase Matrix Ishida, Taku Kano, Sho Wakai, Eiichi Shibayama, Tamaki Makimura, Shunsuke Abe, Hiroaki Materials Science Accelerator Physics Aiming to simulate the radiation damage effect on a dual alpha+beta phase Ti-6Al-4V alloy utilized as high-intensity accelerator beam window material, a series of irradiation experiments were conducted with a 2.8 MeV-Fe^2+ ion beam in several dpa regions at room temperature. The nano-indentation hardness increased steeply at 1 dpa and unchanged up to 10 dpa, due to the saturation of defect clusters and tangled dislocations in the dominant alpha-phase matrix with a size of 2~3 nm and a density of about 1x10^23 m^-3. In contrast in the intergranular beta-phase, larger loops of 20~30 nm diameter were observed with much less density of about 5x10^20 m^-3. The diffraction pattern showed rectilinear diffuse streaks between the beta-phase reflections, corresponding to the omega-phase precursor, without dose dependency in its intensity. FFT/I-FFT analysis of the HREM revealed a sub-nanometer-sized lattice disorder with local fluctuations, not discrete but continuous, and homogeneously distributed within the matrix beta-phase stably against the irradiation. The significantly low dislocation density and the absence of phase transformation in the beta-phase matrix could be attributed either to the strong sink effect expected for this distinctive sub-nanometer-sized homogeneous lattice disorder or to the anomalous point defect recombination induced by the high mobility of vacancies, both of which are originated from the metastable omega-phase precursors specifically formed in the beta(BCC) phase of group-4 transition metals. |
| title | Contrasting Irradiation Behavior of Dual Phases in Ti-6Al-4V Alloy at Low-Temperature Due to Omega-phase Precursors in Beta-phase Matrix |
| topic | Materials Science Accelerator Physics |
| url | https://arxiv.org/abs/2405.00517 |