Microstructure and hardness of titanium and iron surfaces after megaelectronvolt nitrogen implantation

✍ Scribed by A.M Vredenberg; F.Z Cui; F.W Saris; N.M Van der Pers; P.F Colijn

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 621 KB
• Volume: 115
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(89)90694-1

✦ Synopsis

Effects of MeV N + implantation in titanium and iron surfaces on the microstructure and hardening have been examined. In both metals, high nitrogen concentrations could easily be built up over a depth of about 1 pro, as observed with Rutherford backscattering spectrometry. Nitride formation was demonstrated by X-ray diffraction, both in titanium and iron. Hardness measurements indicated that the load-carrying abilities of unimplanted or even low energy nitrogen implanted specimens could be enhanced significantly by MeV implantation. In 1 MeV irradiated titanium, for example, an increase in surface hardness of 30% using a load as heavy as I00 g was observed, while no hardening effects could be detected using this load on 35-200 keV implanted specimens.

MeV implantation of titanium induced some surface texturing, whereas iron surfaces remained smooth. At doses higher than 0.65x10 I~ cm-: blisters appeared at the iron surface and at even higher doses' the apparent nitrogen peak concentration showed a saturation effect.