Influence of hot rolling on the phase composition, structure, and mechanical properties of metastable (α+β) alloy based on Cu–41 wt % Zn with shape memory effect

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Abstract

A comprehensive study of the influence of hot rolling on structural-phase transformations and physical and mechanical properties of a metastable (α+β) alloy with a shape memory effect Cu–41wt % Zn is carried out. Structural-phase transformations were are investigated using optical and electron microscopy, X-ray phase analysis, and differential scanning calorimetry (when heated). It is discovered that intermediate bainitic transformations occur in the alloy along with the formation of martensitic phases. The peculiarities of the mechanical behavior of the alloy are established when testing samples using the uniaxial tensile method after hot rolling and subsequent heat treatments. It has been established that hot rolling with a total reduction of 90% and subsequent heat treatment leads to an increase in the ductility of the alloy up to 48%.

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About the authors

А. Е. Svirid

Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Author for correspondence.
Email: svirid@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

V. G. Pushin

Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: svirid@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

N. N. Кuraпova

Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: svirid@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

S. V. Afanasiev

Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: svirid@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

D. I. Davydov

Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: svirid@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

L. A. Stashkova

Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: svirid@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

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Supplementary files

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2. Fig. 1. X-ray diffraction patterns of Cu–41%Zn alloy after quenching (a), hot rolling with 90% reduction (b), subsequent annealing at 120°C for 5 min (c) or 200°C for 2 h (d) and the corresponding hkl reflection bar diagrams of the α(FCC), 3R, 9R and β(BCC) phases.

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3. Fig. 2. OM (a, b) and SEM (c, d) images of the microstructure of the Cu–41%Zn alloy after hot rolling with a reduction of 90% and quenching in water. In the OM images, the α grains are lighter in contrast. In the SEM images, the α grains are darker, and the 3R/9R grains located between them are light. The unidirectional structure of bainite is indicated by arrows (d).

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4. Fig. 3. Deformation curves σ–δ of the Cu–41%Zn alloy after hot rolling with quenching (curve 1) and subsequent annealing at 200°C for 2 h (curve 2).

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5. Fig. 4. OM images of the microstructure of the Cu–41%Zn alloy after hot rolling with quenching (a) and annealing at 200°C for 2 h (b).

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6. Fig. 5. Bright-field TEM images (a, b) and the corresponding electron diffraction pattern (a – inset – zone axis [112]) of the α-phase of the Cu–41%Zn alloy after hot rolling and water quenching. Arrows indicate the β′-particles of the β-phase enriched in Zn in the images of dislocation slip bands.

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7. Fig. 6. DSC curves of the Cu–41%Zn alloy after quenching (curve 1) and hot rolling with quenching (2).

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