Structural and Mechanical Properties of Ion Implanted Al and Cu

Abstract

ABSTRACTTensile deformation experiments on Al single crystals and parallel microstructural studies by T.E.M. on specimens directly thinned prior to a Zn+ ion implantation have been carried out. An uniform concentration of 7 at % Zn has been obtained on 1200Å thick layers by implantation using multiple energies. The temperature ranges of metastable phase of these samples are different from bulk Al-Zn alloys of identical concentration. Room and 80°C temperature thermal treatments leading to an important precipitation hardening in bulk alloys do not produce any significant mechanical modification in implanted Al single crystals. T.E.M. observations do not show any supplementary scattering around Bragg spots. On the contrary, we observe the direct appearance of precipitates at 135°C and 150°C after some days annealing.High cycle reversed load fatigue test in vacuum show significant modifications of surfacedamage of an oxygen implanted copper specimen.