We present results of experiments on the action of nanosecond pulsed beams of nitrogen ions and nitrogen plasma on specimens of Ti-4 Al-3 V (wt %) alloy that were obtained using a plasma focus device. Two regimes of material treatment were studied: a high energy irradiation (with radiation power density of 10 8 W/cm 2 ), where the surface layer is melted, and a softer irradiation regime (with radiation power density of 10 7 W/cm 2 ), where a liquid phase on the surface is not formed. The mechanisms of surface modification and hardening of Ti-4 Al-3 V alloy corresponding to different irradiation regimes are discussed.

Manufacturing features, structure and properties of low-alloyed molybdenum sheets 0.5 mm thick made from the experimental Mo-3 wt.% Re single crystal are described and discussed in the present work. The developed technological scheme includes warm rolling of the initial ingot at a temperature of 1150 °C, with heating in the argon protective atmosphere, subsequent annealing at 850 °C for 2/3 h in a vacuum, no less than 1 ·103 mmHg, cold rolling at a temperature of 400 °C, and post-deformation annealing at 800 C for 1/2 h. The results of micro structure analysis, physical and mechanical studies show that thin sheets are characterized by simultaneously high strength and plasticity, as well as the required temperature coefficient of linear expansion (TCLE), necessary for bonding with a glass by a thermo-compression welding. Obtained results reveal perspectives for the development of the application of thin Mo-3 wt.% Re sheets in vacuum engineering for the vacuum-tight metal-glass parts.

No abstract