Crater formation on the surface of metals and alloys bombarded with high-power ion beams: the effect of a preliminary treatment of the surface

V. A. Shulov, G. E. Remnev, N. A. Nochovnaya, I. G. Polyakova, I. F. Isakov, A. I. Ryabchikov, V. A. Koshcheev, R. P. Popova

Research output: Contribution to journalArticle

Abstract

Auger electron spectroscopy, scanning electron microscopy and optical microscopy in a polarized light were used to study the physico-chemical state of the surface of refractory titanium alloys (VT25U, VT8M, VT9 and VT33) and steels (EP866sh and EP718ID) subjected to various mechanical and chemical treatments, a continuous and pulsed implantation followed by exposure to a 300 keV nanosecond beam of carbon ions (70%) and protons (30%) at two ion current densities 60-80 and 120-140 A/cm2 in a pulse. It is shown that pretreatment of materials can drastically change the number, size and surface distribution of radiation-induced craters. The possible mechanisms for crater formation are discussed. The most likely explanation for the craters caused by a high-power ion beam irradiation is screening of some surface regions at the initial stage of the pulse action as a result of the formation of a heterogeneous vapor-plasma cloud of volatile substances (primarily hydrocarbons) adsorbed at the surface.

Original languageEnglish
Pages (from-to)1145-1157
Number of pages13
JournalPhysics, chemistry and mechanics of surfaces
Volume11
Issue number11
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Engineering(all)

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