Directed changing properties of amorphous and nanostructured metal alloys with help of nanosecond laser impulses

Physical Mechanism of Selective Healing of Nanopores in Condensed Matter under the Influence of Laser Irradiation and Plasma

“…The gas–plasma cloud partially shields the energy of the laser impulse. Further heating of the material using a laser impulse is caused by the effect of a gas–plasma cloud [ 2 , 23 , 35 , 36 ].…”

“…A significant change in the mechanical properties after selective laser treatment was observed in a surface layer with a thickness of 0.5–1 mkm [ 2 , 13 , 23 ]. Consequently, the sizes of the pores and the sizes of the pore system were chosen so that they were located in a layer with a thickness of less than 1 mkm.…”

“…The physics of selective interaction of short-pulse laser irradiation with inhomogeneous (defective) areas in condensed matter is a perspective both in the field of condensed matter physics and in the field of physical materials science [ 1 , 2 , 3 , 4 , 5 , 6 ]. The integral physical properties of some materials are determined by the state of local areas characterized by micro- and nanodimensions.…”

“…As a result of the selective effect of short-pulse laser irradiation on the defective areas of nanocrystalline metal alloys, the effects of simultaneous increases in microhardness and plastic characteristics were found. In the works of [ 2 , 13 , 14 , 23 ], significant increases in the hardness (nano- and microhardness) and plastic characteristics associated with the resistance of the surface to crack formation under intense local loading of the diamond pyramid have been determined. The local increase in the strength characteristics of the material was qualitatively explained on the basis of ideas about the possibility of laser healing of defects such as pores and microcracks.…”

Nitrogen Steels and High‐Nitrogen Steels: Industrial Technologies and Properties

“…[ 55 ] According to experimental data and computer, modeling of the laser welding of more thick sheets requires preheating. [ 56–58 ] The austenitic structure of new steels is stable not only at all testing temperatures [ 59 ] but also after thermal cycling according to the regime 400 cycles −100 to +100 °C. [ 60 ] Mechanical properties ( Table 8 ) as well as resistivity to general, pitting, and intercrystallite corrosion [ 61 ] are high for all tested steels.…”