Copper coatings for minimization of retention and permeation of implanted tritium in aluminum alloy 6061 |
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Authors: | M Y Inal M Alam |
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Affiliation: | (1) the Department of Materials and Metallurgical Engineering, New Mexico Institute of Mining and Technology, 87801 Socorro, NM |
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Abstract: | Copper coatings deposited on Al-6061 substrates by radio frequency magnetron sputtering, to prevent the retention and permeation
of energetically implanted tritium in Al-6061, were evaluated by a variety of characterization techniques. The coatings, weighing
in the 0.03 to 0.088 kg/m2 range, were smooth and had a fine grain structure. They contained the intermetallic phases Cu9Al4 and CuAl2 as well as copper. The fractions of Al and Cu in any coating increased and decreased, respectively, with increasing depth
below the surface. Furthermore, the fractions of Al and Cu on the coating surface decreased and increased, respectively, with
increasing coating weight. There was no texture or preferred orientation in the Cu phase of the coatings. A significant amount
of oxygen was also detected at the original substrate surface. Residual stress measurements revealed that, in both Cu and
CuAl2, the stresses in the coating plane were compressive, while the stress normal to the coating plane was zero in Cu but tensile
in CuAl2. The shear-stress components were, however, negligible in both the Cu and CuAl2 phases. In the coating plane, the residual stress in Cu was always much smaller than that in the CuAl2 phase. Bond-strength measurements using tensile-pull testing provided a lower limit of the bond strength of about 2 MPa. |
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