Features of the morphology, defect substructure, and phase composition of metal and alloy surfaces upon high-power ion beam irradiation

• Published in: Surface & coatings technology 2004-07, Vol.185 (1), p.38-49
• Main Authors: Korotaev, A.D, Tyumentsev, A.N, Pinzhin, Yu.P, Remnev, G.E
• Format: Article
• Language: English
• Subjects: Dislocation; Ion beams; Metals; Structure
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2003.11.021

Optical metallography, transmission electron microscopy, and phase analysis were used to study the mechanisms of structural transformations in the surface layer of thickness Δ h≈0.2 μm for single crystals and polycrystals of metals and alloys irradiated with high-power ion beams (HPIB's). Characteristic features of the formation of the surface relief and variations in phase constitution and defect substructure of pure metals (Ni, Mo) and single-phase (Mo–Re, Ni 3Al) and double-phase (V–ZrO 2) alloys have been found in relation to the ion beam power density Q=(1–10)×10 7 W/cm 2. Common features and distinctions in the formation of the microstructure of metallic materials belonging to different classes under HPIB irradiation have been revealed. Based on the predictions of a numerical simulation of the time-dependent temperature fields and the melting and evaporation processes in the surface layer, the mechanisms for the phase-structure modification of metal and alloy surfaces are analyzed.