Effect of Aluminium Content on Plasticity Characteristics of an Experimental Intermetallic Titanium Alloy

The paper considers the issues of changing the plasticity characteristics of an experimental intermetallic alloy depending on the aluminum content. Based on the conducted studies (analysis of the structure and determination of mechanical properties), it was shown that plasticity in the experimental alloy can vary almost twice depending on the aluminum content within the alloying interval.В работе рассмотрены вопросы изменения характеристик пластичности опытного интерметаллидного сплава в зависимости от содержания алюминия. На основе проведенных исследований (анализа структуры и определения механических свойств) показано, что относительное удлинение (пластичность) в экспериментальном сплаве может изменяться практически в 2 раза в зависимости от содержания алюминия в пределах интервала легирования

Hot deformation behavior and processing maps of B and Gd containing β- solidified TiAl based alloy

High-temperature mechanical behavior and microstructure evolution during hot deformation of an as-cast β-solidified Ti-43.2Al-1.9V-1.1Nb-1.0Zr-0.2Gd-0.2B (at.%) alloy were studied. Phase transformation temperatures and associated phase fields (α2 + γ, α + γ, α, and α + β) were established by Thermo-Calc calculations, dilatometry, differential scanning calorimetry and microstructure analysis of specimens annealed at different temperatures. The as-cast alloy was subjected to uniaxial compression at temperatures from 900 to 1250 °C and strain rates in the range 0.001-1 s-

Surface modification of titanium alloys by intense pulsed electron beams

The influence of intense pulsed electron beam (IPEB) treatment on the chemical composition and structure of titanium alloys surface layers is reviewed. The fatigue and oxidation behaviour of irradiated titanium alloys is analyzed. It is shown that IPEB processing allows one to improve service properties of titanium alloys dramatically. The recycling of some aircraft components after their "long life" operation have to be realized using IPEB treatment at high values of the energy density in a pulse is also described. The application of IPEB processing is illustrated for compressor blades of aircraft engines

Surface modification of titanium alloys by intense pulsed electron beams

The influence of intense pulsed electron beam (IPEB) treatment on the chemical composition and structure of titanium alloys surface layers is reviewed. The fatigue and oxidation behaviour of irradiated titanium alloys is analyzed. It is shown that IPEB processing allows one to improve service properties of titanium alloys dramatically. The recycling of some aircraft components after their "long life" operation have to be realized using IPEB treatment at high values of the energy density in a pulse is also described. The application of IPEB processing is illustrated for compressor blades of aircraft engines

The mechanisms of element redistribution in the surface layer of multicomponent alloys during their irradiation by high power pulsed ion beams

It is shown that redistribution of elements in the surface layer proceeds depending on a type of the stable diagram ("based" element-alloyed element) if treatment by high power pulsed ion beam takes place under the melting condition, when irradiation has been conducted at low values of ion current density (j<60 A cm'2). Here the impurity having a coefficient of distribution (ki) lesser 1 is supplanted by the solidified front to the surface but if ki>1 than the element is concentrated in the zone between matrix and solidified alloy. This mechanism and else a mechanism of intense evaporation of volatile components proceed during irradiation at higher values of j. At j>120-140 A cm'2 the chemical composition of the surface changes "from point to point” to a great extent due to crater formation

The mechanisms of element redistribution in the surface layer of multicomponent alloys during their irradiation by high power pulsed ion beams

It is shown that redistribution of elements in the surface layer proceeds depending on a type of the stable diagram ("based" element-alloyed element) if treatment by high power pulsed ion beam takes place under the melting condition, when irradiation has been conducted at low values of ion current density (j<60 A cm'2). Here the impurity having a coefficient of distribution (ki) lesser 1 is supplanted by the solidified front to the surface but if ki>1 than the element is concentrated in the zone between matrix and solidified alloy. This mechanism and else a mechanism of intense evaporation of volatile components proceed during irradiation at higher values of j. At j>120-140 A cm'2 the chemical composition of the surface changes "from point to point” to a great extent due to crater formation

Surface modification of refractory alloys with high-power pulsed ion-beam treatment and arc-pulsed ion implantation

High-power pulsed ion beam (HPPIB) treatment and arc-pulsed ion implantation (APII) were combined consecutively to be the improvement of service properties of high temperature refractory alloys. The influence of this combined processing on the physical and chemical state of refractory alloy surface layers was studied. It is shown that it is possible to combine the positive effects of each technology in order to obtain an ideal smooth surface (without craters, Ra =0.06-0.10 pm) and to increase the alloyed surface layer thickness due to irradiation-enhanced diffusion. Consequently, the positive effect of this combined treatment on the fatigue strength, salt corrosion resistance, and oxidation resistance is connected with the following processes: smoothing of a surface microrelief; high-speed-solidification; surface alloying; structure stabilization during a post-process vacuum annealing

Kinetics of evaporation from the surface of refractory nickel and titanium alloys with heat resistant coatings during their irradiation by high-power pulsed ion beams

The effect of the irradiating conditions by high-power pulsed ion beams (HPPIB) on the ablation rate was studied. The conditions of irradiation (ions of carbon and protons, ion energy E=300-600 keV, the ion current density in a pulse j=60-500 A cm" pulse duration т=50-100 ns) were realized in Temp and Vera accelerators. The study of the evaporation kinetics was carried out using targets manufactured from GS26NK nickel super-alloy with NiCrAlY coating and from VT9 and VT18U titanium alloys with ZrN and TiSiB coatings. It is shown that values of the ablation rate achieve 0.04 µm (TiSiB), 0.4 µm (NiCrAlY), and 1 µm (ZrN) during a pulse under the optimal conditions of HPPIB irradiation