Study of the evolution of the structure of a high-entropy Al20Ni20Co20Fe20Cr20 alloy under the action of high pressures and temperatures

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Abstract

Electron microscopic and X-ray studies of the structure of a high-entropy submicrocrystalline AlNiCoFeCr alloy of equiatomic composition obtained by arc melting were performed. The alloy consists of a substitutional solid solution with a packing of components corresponding to the B2 structure based on a distorted bcc lattice. The average grain size of the B2 phase is 120 nm. The stability of the alloy with increasing temperature was studied. When the alloy is heated to 1650oC and subsequent solidification, an increase in the grain size of the B2 phase and the separation of several phases with different morphologies along the grain boundaries are noted in the structure. The effect of high pressure on the structure of the alloy after quenching from the liquid phase was studied. The structure of the sample obtained upon solidification at a temperature of 1650°C under a pressure of 5 GPa is different from the structure of the alloy obtained at a temperature of 1650°C by arc melting. Under thermobaric conditions, a structure of mixed phases of A1 and A2 types is formed in the alloy. The alloy has high hardness, the value of which, depending on the selected production conditions, varies from 4.8 to 5.5 GPa.

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S. G. Menshikova

Udmurt Federal Research Center of the UB RAS

Author for correspondence.
Email: svetlmensh@mail.ru
Russian Federation, Izhevsk

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2. Fig. 1. The initial AlNiCoFeCr ingot obtained by the arc melting method.

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3. Fig. 2. Schematic view of the graph of the dependence of the temperature difference ΔT on time, recorded by a differential thermocouple using DTA (a); DTA measurement scheme (b) [26].

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4. Fig. 3. Schematic diagram of the “Toroid” type chamber: 1 - solid substance; 2 - toroidal cavity; 3 - central part in the form of a lentil; 4 - heater and sample; 5 - steel rings; 6 - support plates.

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5. Fig. 4. Structure (a) and X-ray diffraction pattern (b) of the initial AlNiCoFeCr ingot. In the X-ray diffraction pattern, the circles indicate reflections related to the nickel monoaluminide NiAl phase.

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6. Fig. 5. DTA thermograms of the Al20Ni20Co20Fe20Cr20 alloy obtained during heating (1) and subsequent cooling (2).

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7. Fig. 6. Morphology (a–c) and concentration maps of the distribution of the phase containing Cr, Fe, Co, Ni (d, red) and each of the elements (e–i) in the sample obtained after heating to 1650°C and subsequent cooling at a pressure of 105 Pa at a rate of 1°C/s.

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8. Fig. 7. Morphology (a), X-ray diffraction pattern (b) and concentration maps of the distribution of the phase containing Cr, Fe, Co, Ni (c, red) and each of the elements (d–h) in the Al20Ni20Co20Fe20Cr20 sample obtained after heating to 1650°C and subsequent cooling at 5 GPa at a rate of 1000°C/s. In the X-ray diffraction pattern, reflections related to phases of type A1 and A2, respectively, are marked with diamonds and squares.

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9. Fig. 8. Microhardness HV of the initial sample (1), the sample after heating and subsequent cooling (2), and the sample after high-pressure treatment (3).

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