Peculiarities of the Behavior of Point Defects under the Optoplastic Effect in Copper

• Published in: Physics of metals and metallography Vol. 124; no. 7; pp. 728 - 733
• Main Authors: Malinskii, T. V., Rogalin, V. E., Shur, V. Ya, Kuznetsov, D. K.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-07-2023; Springer; Springer Nature B.V
• Subjects: Chemistry and Materials Science; Lasers; Mass transfer; Materials Science; Metallic Materials; Point defects; Strength and Plasticity; Ultraviolet lasers; polished surface; point defects; scanning electron microscopy; metal swelling; Schottky mechanism; plastic deformation; optical durability; optoplastic effect
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X2360104X

The authors previously discovered a new optoplastic effect and observed it under the action of a nanosecond UV laser pulse irradiation of subcritical intensity. In this paper it is shown that under this effect no micropores arise in the subsurface layer of metal. This proves the statement that swelling of metal under laser impact of moderate (subcritical) intensity occurs due to interstitial atoms migrating to the surface and not due to melting with formation of bubbles. At a abrupt cooling (for ~20 μs) interstitial atoms migrate to the surface by the Schottky mechanism due to abnormal mass transfer and the less mobile vacancies have no time to coagulate with formation of micropores in the time of the process.