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Title: X-Ray Diffraction, Annealing, and Oxidation Studies of Proton Irradiated Beryllium

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1354636
Report Number(s):
BNL-113779-2017-CP
DOE Contract Number:
SC00112704
Resource Type:
Conference
Resource Relation:
Conference: ACCAP; La Grange Park IL 60526; 20170411 through 20170411
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Simos N., Simos N., and Elbakhshwan,M. X-Ray Diffraction, Annealing, and Oxidation Studies of Proton Irradiated Beryllium. United States: N. p., 2017. Web.
Simos N., Simos N., & Elbakhshwan,M. X-Ray Diffraction, Annealing, and Oxidation Studies of Proton Irradiated Beryllium. United States.
Simos N., Simos N., and Elbakhshwan,M. Tue . "X-Ray Diffraction, Annealing, and Oxidation Studies of Proton Irradiated Beryllium". United States. doi:. https://www.osti.gov/servlets/purl/1354636.
@article{osti_1354636,
title = {X-Ray Diffraction, Annealing, and Oxidation Studies of Proton Irradiated Beryllium},
author = {Simos N. and Simos N. and Elbakhshwan,M.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 11 00:00:00 EDT 2017},
month = {Tue Apr 11 00:00:00 EDT 2017}
}

Conference:
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  • Lattice parameter changes which occur on neutron irradiation of hot pressed beryllium oxide to integrated fission neutron doses of 1 x 10/sup 19/ nvt to 3.5 x 10/sup 20/ nvt at 75-100 deg C and to doses of 1--1.5 x 10/sup 20/ nvt at 500--650 deg C are reported. It is shown that an anisotropic lattice expansion occurs, the expansion in the c direction being greater than the expansion in the a direction. The lattice expansion at irradiation temperatures of 500--600 deg C is almost a factor of three smaller than for equivalent neutron doses at 75-100 deg C. Themore » volume expansion calculated from x-ray data is shown to agree with the macroscopic volume expansion. At doses of 3.5 x 10/sup 20/ nvt and above at temperatures of 75--100 deg C, crumbling and cracking of the specimens occurs because of the intergranular stresses caused by the anisotropic expansion. The disagreement between various workers as to the degree of the anisotropy is explained in terms of the effect on the lattice parameters of the intergranular stress in solid polycrystalline specimens. The annealing behavior of the lattice parameter changes is described and it is shown that temperatures of 1400--1500 deg C are required for complete recovery of the damage to occur. Line broadening effects are discussed in a qualitative manner and it is suggested that defect clusters are formed in the basal planes of the hexagonal beryllium oxide lattice. (auth)« less
  • AlBeMet 162 (Materion Co., formerly Brush Wellman) has been irradiated with 145 MeV protons up to 1.2x10 20 cm -2 fluence, with irradiation temperatures in the range of 100-220oC. Macroscopic postirradiation evaluation on the evolution of mechanical and thermal properties was integrated with a comprehensive X-ray- diffraction study using high-energy monochromatic and polychromatic X-ray beams, which offered a microscopic view of the irradiation damage effects on AlBeMet. The study confirmed the stability of the metal-matrix composite, its resistance to proton damage, and the continuing separation of the two distinct phases, fcc aluminum and hcp beryllium, following irradiation. Furthermore, based onmore » the absence of inter-planar distance change during proton irradiation, it was confirmed that the stacking faults and clusters on the Al (111) planes are stable, and thus can migrate from the cascade region and be absorbed at various sinks. XRD analysis of the unirradiated AlBeMet 162 showed clear change in the texture of the fcc phase with orientation especially in the Al (111) reflection which exhibits a “non-perfect” six-fold symmetry, implying lack of isotropy in the composite.« less
  • AlBeMet 162 (Materion Co., formerly Brush Wellman) has been irradiated with 145 MeV protons up to 1.2x10 20 cm -2 fluence, with irradiation temperatures in the range of 100-220oC. Macroscopic postirradiation evaluation on the evolution of mechanical and thermal properties was integrated with a comprehensive X-ray- diffraction study using high-energy monochromatic and polychromatic X-ray beams, which offered a microscopic view of the irradiation damage effects on AlBeMet. The study confirmed the stability of the metal-matrix composite, its resistance to proton damage, and the continuing separation of the two distinct phases, fcc aluminum and hcp beryllium, following irradiation. Furthermore, based onmore » the absence of inter-planar distance change during proton irradiation, it was confirmed that the stacking faults and clusters on the Al (111) planes are stable, and thus can migrate from the cascade region and be absorbed at various sinks. XRD analysis of the unirradiated AlBeMet 162 showed clear change in the texture of the fcc phase with orientation especially in the Al (111) reflection which exhibits a “non-perfect” six-fold symmetry, implying lack of isotropy in the composite.« less