Accession Number : AD0712232

Title :   STRUCTURAL EFFECTS AND SURFACE EROSION IN METALS IRRADIATED BY 10 to the -8th power SECOND LIGHT PULSES FROM A LASER,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Akimov,A. I. ; Mirkin,L. I.

Report Date : 31 JUL 1970

Pagination or Media Count : 17

Abstract : The surfaces of twenty metals and several steels were studied after the action of a modulated light pulse. On the surface of the specimens spots appeared with a rough surface which, as the profilograms showed, had a rippled structure. The height of projections and depth of depressions grow with a decrease in the melting point of the metal. The effects of the increase in density of crystal-lattice defects are observed to be considerably less in absolute magnitude than when under the effect of unmodulated pulse of the same energy. Apparently, structural effects in metal are caused from the heating of the metal by expanding plasma, and the wave-shaped profile of the surface appears when it melts and comes under the effect of a shock wave. (Author)

Descriptors :   (*LASERS, THERMAL STRESSES), (*METALS, SURFACE ROUGHNESS), BLOOD PLASMA SUBSTITUTES, SHOCK WAVES, CRYSTAL DEFECTS, HEATING, USSR, MELTING POINT

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE