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0219U102094,
0119U101819
,
Physical mechanisms of plastic deformation of nanostructured high entropy alloys FeCrCoNi and FeCrCoNiС with improved ratio “strength – plasticity” in temperature range 300–0.5 K
Semerenko Yuri O., Кандидат фізико-математичних наук
18-12-2019
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
For the non-equiatomic medium-entropy Co17.5Cr12.5Fe55Ni10Mo5 alloy in the coarse-grained state at the temperature interval 300 - 0.5 K, the following was established: а) it was obtained deformation curves σ (ε) of the alloy at uniaxial tensile with a constant strain rate in the temperature range of 300-0.5 K; б) it was obtained the temperature dependences of the yield strength σ0, the strain hardening and plasticity in the temperature range 300 - 0.5 K; в) the temperature dependences of the dynamic modulus of elasticity and acoustic absorption are obtained in the temperature range 4.2-425 K; г) it was found that the test alloy has high strength and ductility throughout the temperature range 300 – 0.5 К; д) revealed that in the temperature range of 4.2 – 280 K the temperature dependences of the acoustic characteristics of the alloy have a monotonic character, which indicates the stability of the phase-structural characteristics of the alloy in this temperature range; е) at a temperature of about 340 K there is a wide relaxation resonance, the nature of which is now being elucidated; ж) the phase composition and microstructure of coarse-grained medium-entropy non-atomic alloy Co17.5Cr12.5Fe55Ni10Mo5 in initial state. It is established that high-pressure torsion (HPT) at temperatures of 300 and 77 K allows to obtain a nanostructured state with an average grain size of ~ 70 nm in Co17.5Cr12.5Fe55Ni10Mo5 alloy.
2020-04-02
Updated: 2025-12-08
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