Nanostructured surface processing by an intense pulsed ion beam irradiation
- Himeji Inst. of Tech., Hyogo (Japan)
- Kobe City College of Technology, Hyogo (Japan)
- Nippon Steel Co., Himeji, Hyogo (Japan)
Metal surface modification by irradiating an intense pulsed ion beam (IPIB) with short pulse width has been studied experimentally. An IPIB irradiation to a target leads to rapid heating above its melting point. After the beam is turned off, the heated region is immediately cooled by thermal conduction at a cooling rate of typically 10{sup 10} K/s. This rapid cooling and resolidification results in generation of nanostructured phase in the top of surface. The typical hydrogen IPIB parameters are 200 kV of energy, 500 A/cm{sup 2} of current density and 70 ns of pulsewidth. The IPIB was irradiated on a pure titanium to generate nanocrystalline phase. The IPIB-irradiated surface was examined with X-ray diffraction, SEM, and HR-TEM. The randomly oriented lattice fringes as well as a halo diffraction pattern are observed in the HR-TEM micrograph of IPIB-irradiated titanium. The average grain size is found to be 32 nanometers.
- OSTI ID:
- 338508
- Report Number(s):
- CONF-970559--
- Country of Publication:
- United States
- Language:
- English
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