TOMSK, Oct 27 – RIA Tomsk. Physicists of Tomsk State University (TSU) found a way to significantly
increase the strength of multicomponent alloys that can withstand temperatures
up to minus 200 degrees; these materials can be used, for example, to
strengthen the bow of icebreakers or on oil pipelines in the Arctic, the
university's press service said on Tuesday.
Results of scientific work employees of the Laboratory
for Physics of High-Strength Crystals of the TSU Siberian Physical-Technical
Institute (SPTI) were presented at the international conference and the school
of young scientists in Belgorod.
"Laboratory employees <...> have found a
way to harden multicomponent alloys that can withstand the action of critically
low temperatures, close to minus 200 degrees", – says the message.
It is explained that in the course of scientific work,
the laboratory staff first subjected the alloys to deformation at a temperature
close to minus 200 degrees Celsius, then they were kept at a temperature of
plus 650 degrees for four hours. After that, its strength increased 2.5 times –
both at temperatures from room temperature to minus 196, and at high
temperatures up to plus 700 degrees.
© Сергей Никифоров
"A distinctive feature of high-entropy alloys is
their composition. Such materials contain five or more metals mixed in
approximately equal amounts. High-entropy alloys have unique mechanical
properties: high strength, good ductility while maintaining fracture toughness
up to cryogenic testing temperatures", – the laboratory employee Anna
Vyrodova is quoted in the message.
Modified alloys can be used for the manufacture of
valves on oil pipelines in the Arctic, for the manufacture of wear-resistant
cutting material, a high-strength alloy resistant to water, promising for the
shipping industry, for example, for strengthening individual parts of
icebreakers.
Now the laboratory is solving the problem of
increasing the strength properties of high-entropy alloys at high temperatures.
This will open up the potential for their use as monocrystalline blades for gas
turbines, the TSU message added.