Pulsed ion beam treatment of metals for improved surface properties
- Sandia National Labs., Albuquerque, NM (United States)
- Cornell Univ., Ithaca, NY (United States)
- Naval Research Lab., Washington, DC (United States)
This work builds on previously reported studies using an intense pulsed ion beam to achieve a rapid melt and resolidification (RMR) of a surface metallic layer. Alloys and bi-metal combinations were treated on the RHEPP-1 facility at Sandia National Laboratories sample location, < 10 J/cm{sup 2}. Numerical modeling of thermal histories neglecting ablation have yielded predictions consistent with diagnostic measurements of treated samples. The measurements included scanning electron microscopy (SEM), Rutherford Backscattering Spectrometry (RBS), X-Ray Diffraction (XRD), and electrochemical corrosion tests. Treatment of Al-, Fe-, and Ti-based alloys with multiple beam shots indicates that the extent and nature of beam-induced modification depends on the particular alloy, and on the total number of RMR cycles. Microhardness measurements of a treated and sectioned SS-304 sample show enhancements over bulk values of as much as 50%, and extending over 100 {micro}m below the surface. In treatment of bi-metal combinations (Ion Beam Mixing), the authors have investigated overcoats on Al-, Fe, and Ti-based alloys, where the overcoat layer is applied to the substrate by conventional means such as sputter deposition. In the case of Al, it is well known that certain transition metals (Ti, Cr, Zr, Nb, Hf) can improve corrosion resistance, but are almost insoluble in Al under equilibrium conditions. They have treated samples overcoated with all the metals listed, in thickness ranging from 300 {angstrom} to 2 {micro}m RBS measurements how the overcoat to have mixed into the substrate in peak amounts ranging from 2 at% to 8% to 30%.
- Research Organization:
- Sandia National Laboratory
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 428005
- Report Number(s):
- CONF-960634--
- Country of Publication:
- United States
- Language:
- English
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