NSUF 18-1558: In-situ investigation of the Threshold Incubation Dose for the formation of c-component loops in additively manufactured and powder metallurgy rolled Ti-6Al-4V

In-situ TEM irradiation offers the unique capability to investigate the evolution of the irradiation damage through continual imaging and observation. It allows for quantitative and qualitative microstructural studies. Using IVEM-Tandem Facility at Argonne National Laboratory with its in-situ TEM irradiation capability could improve our understanding of the influence of the microstructure and the thermos-mechanical processing on the irradiation damage in Ti-6Al-4V. We are proposing to irradiate 4 TEM samples with 1 MeV Kr ions at 25 °C and 350°C. The Ti-6Al-4V samples are processed through two different thermomechanical processes: powder metallurgy (PM) rolled and additive manufacturing (AM). The range of Kr ions in a Ti-6Al-4V target estimated with SRIM is 389 nm. A thickness of 100 nm would allow for a homogeneous irradiation of the whole thickness. The samples would be mounted in a double-tilt heating holder. The dpa rate for an ion flux of 4x10e11 ions.cm-2.s-1 is estimated to ~ 10e-3 dpa.s-1. The Threshold Incubation Dose (TID) of the formation of c-loops is expected to be ~ 7 dpa at 25°C and ~ 3 dpa at 350°C. In order to be able to compare the final irradiated microstructure, the samples will be irradiated up to the same final dose (~8 dpa). Adjustments to these dose calculations will be made during the experiment. The irradiation dose rate will be maintained constant throughout the 4 irradiations.

추가 정보

필드	값
Abstract	In-situ TEM irradiation offers the unique capability to investigate the evolution of the irradiation damage through continual imaging and observation. It allows for quantitative and qualitative microstructural studies. Using IVEM-Tandem Facility at Argonne National Laboratory with its in-situ TEM irradiation capability could improve our understanding of the influence of the microstructure and the thermos-mechanical processing on the irradiation damage in Ti-6Al-4V. We are proposing to irradiate 4 TEM samples with 1 MeV Kr ions at 25 °C and 350°C. The Ti-6Al-4V samples are processed through two different thermomechanical processes: powder metallurgy (PM) rolled and additive manufacturing (AM). The range of Kr ions in a Ti-6Al-4V target estimated with SRIM is 389 nm. A thickness of 100 nm would allow for a homogeneous irradiation of the whole thickness. The samples would be mounted in a double-tilt heating holder. The dpa rate for an ion flux of 4x10e11 ions.cm-2.s-1 is estimated to ~ 10e-3 dpa.s-1. The Threshold Incubation Dose (TID) of the formation of c-loops is expected to be ~ 7 dpa at 25°C and ~ 3 dpa at 350°C. In order to be able to compare the final irradiated microstructure, the samples will be irradiated up to the same final dose (~8 dpa). Adjustments to these dose calculations will be made during the experiment. The irradiation dose rate will be maintained constant throughout the 4 irradiations.
Award Announced Date	2018-09-17T12:05:02.66
Awarded Institution	Center for Advanced Energy Studies
Facility	Microscopy and Characterization Suite
Facility Tech Lead	Wei-Ying Chen, Yaqiao Wu
Irradiation Facility	None
PI	Carl Boehlert
PI Email	[email protected]
Project Type	RTE
RTE Number	1558