The microstructures of laser-alloyed Ni-Ta surface layers |
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Authors: | C W Draper J M Gibson D C Jacobson J M Poate S M Shin J M Rigsbee |
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Affiliation: | (1) A. T. & T. Technologies, 08540 Princeton, NJ, USA;(2) A. T. & T. Bell Laboratories, 07974 Murray Hill, NJ, USA;(3) Department of Metallurgy and Mining Engineering, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA |
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Abstract: | Evaporated thin tantalum films on single and polycrystalline nickel have been laser surface alloyed using either continuous-wave CO2 or Q-switched Nd-YAG radiation. In the case of the continuous-wave laser, surface alloys contain amorphous tantalum-rich regions, intermediate polycrystalline bands of TaNi, and an underlying Ni(Ta) solid solution. In the Q-switched laser case, a much more laterally uniform amorphous phase with approximately equal atomic fractions of nickel and tantalum is found, with little evidence of polycrystalline intermetallics.In situ annealing with the electron beam of the microscope results in formation of microcrystallites, predominantly nickel. |
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