Ion-beam mixing of ceramic alloys: preparation and mechanical properties Page: 3 of 7
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different from the annealed-only in two ways: (a) the distinct broadening
of the near surface ^500 X profile and (b) a much larger and nearly featureless
concentration in the depth region >500 A. A similar measurement on Pe'
irradiated Zr is shown in Pig. 2. Obese results differ from the Cr case only
in the deeper minimum around 1200 A. Finally, it was noted in all irradiations
crystals darkened. By etching the surface it was found that the discoloration
occurred throughout the depth of the implant to approximately 1 pm
Cr ON *1(03
MIXED (2>«0*7 F»/cm*)
:aled only <600*c>
400 900 1200 1600 2000 2400 2*00
Fig. 1. Depth-concentration profiles
of Cr coated AI2O3 samples following
Fe+ ion irradiation at T <300°C.
-->Z> ON A120j
ION MIXED (2>t0,r Ft/tfli*)
Fig. 2. Depth concentration profiles
of a Zr coated AI2O3 sample following
Fe+ ion irradiation at T <300*C.
Channeling spectra corresponding to the profiles in Figs. 1 and 2 are given
in Fig. 3 for Cr and Zr. The near surface region in Fig. 1 corresponds to
channels near 250 for Cr and 125 for A1 backscattering in Fig. 3. The yield
(counts/channel) in both surface regions for the aligned spectrum are much
lower than in the random spectrum. In addition, the A1 backscattering from the
deeper regions of the crystal corresponding to channels below 100 shows little
difference between the aligned (irradiated) curve and the virgin (unirradiated)
case. A similar relationship can be seen in Fig. 3 for the analysis of the
irradiation of the Zr film. Quantitative values are given in Table I.
The Xai (channeling minima) values shown in Table I were used along with -
XCr and xzr minima in order to estimate the fraction of substitutionality of
the ion mixed metal atoms. These results are given in the right-hand column of
Table I. The result of the hardness tests indicated that the hardness
increased 21". for the Cr mixed surface and 20" for the Zr nixed case. An
irradiated surface without evaporated film showed a hardness increase of 15%.
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Lewis, M.B. & McHargue, C.J. Ion-beam mixing of ceramic alloys: preparation and mechanical properties, article, January 1, 1981; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1096930/m1/3/: accessed June 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.