Speaker
Ms
AIDA Amroussia
(MICHIGAN STATE UNIVERSITY)
Description
Due to their low activation, corrosion resistance, good mechanical properties, and their commercial availability, Ti-alloys, especially the α+β alloy Ti-6Al-4V (wt%), are considered for different applications in nuclear industry. Ti-6Al-4V is also being considered as a structural material for the beam dump for the Facility for Rare Isotope Beams (FRIB) at Michigan State University- a new generation accelerator with high power heavy ion beams. In this study, samples of commercially pure (CP) Ti and Ti-6Al-4V that were processed through two different thermomechanical processes: powder metallurgy (PM) rolled and additive manufacturing (AM) were utlilized. The as-received samples exhibited two distinctly different microstructures. The powder metallurgy (PM) rolled sample had equiaxed α-phase grains with the β-phase typically present at the grain boundaries whereas the additive-manufactured sample showed a lamellar α +β microstructure. The samples were irradiated at Notre Dame University using 4 MeV Ar ion beam at 25°C and 350°C. For the samples irradiated at RT, similar final dose of 7.3 dpa within the depth of 1 µm from the surface was obtained using two different dose rates of 0.8 dpa/h and 13.4 dpa/h. Nano-indentation measurements were carried out on the surface of the bulk samples to estimate the irradiation hardening. While CP-Ti exhibited the highest irradiation induced hardening, the nano-hardness of the additive-manufactured Ti-6Al-4V was found to be sensitive to the dose rate effect. To better understand the defect structure in the irradiated samples, 3 mm thin foils were prepared for the ongoing Transmission Electron Microscopy (TEM) characterization.
Primary author
Ms
AIDA Amroussia
(MICHIGAN STATE UNIVERSITY)
Co-authors
Dr
Boopathy Kombaiah
(Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831)
Dr
Clara Grygiel
(CIMAP-CIRIL, BP 5133, 14070 CAEN CEDEX 5, France)
Dr
Daniel Robertson
(Department of Physics, University of Notre Dame, Notre Dame, IN 46556)
Dr
Edward Stech
(Department of Physics, University of Notre Dame, Notre Dame, IN 46556)
Dr
Florent Durantel
(CIMAP-CIRIL, BP 5133, 14070 CAEN CEDEX 5, France)
Dr
Frederique Pellemoine
(Michigan State University - Facility for Rare Isotope Beams)
Dr
Isabelle Monnet
(CIMAP-CIRIL, BP 5133, 14070 CAEN CEDEX 5, France)
Dr
Mikhail Avilov
(FRIB Michigan State University)
Dr
Tan Ahn
(Department of Physics, University of Notre Dame, Notre Dame, IN 46556)
Prof.
Wolfgang Mittig
(MSU-NSCL)
Prof.
carl boehlert
(michigan state university)