Structure features and mechanical properties of metastable Cu–39.5 wt % Zn (α+β) alloy with shape memory effect subjected to thermomechanical treatment

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Abstract

A comprehensive study of structural-phase transformations and physical and mechanical properties of metastable Cu–39.5 wt % Zn α + β alloy with shape memory effect subjected to thermomechanical treatments including cold rolling and annealing has been carried out. The features of the fine structure formed at the intermediate and bainitic phase transformations have been studied using optical and electron microscopy as well as X-ray phase analysis. The temperature intervals of bainitic 3R/9R and other phase transformations were established by differential scanning calorimetry during heating up to 500°C. In the case of the hardened alloy, the temperature of the bainitic transformation was close to 170°C. In mechanical tests conducted using uniaxial tension, it has been demonstrated that cold deformation and post-deformation heat treatment under different modes can be employed to obtain the alloy in high-strength or ductile states. These states are characterized by an ultimate strength (σu) greater than 700 MPa and a relative elongation (δ) greater than 40%, respectively.

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About the authors

A. E. Svirid

Mikheev Institute of Metal Physics, Ural Branch of the RAS

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

V. G. Pushin

Mikheev Institute of Metal Physics, Ural Branch of the RAS

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

N. N. Kuranova

Mikheev Institute of Metal Physics, Ural Branch of the RAS

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

S. V. Afanasyev

Mikheev Institute of Metal Physics, Ural Branch of the RAS

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

D. I. Davydov

Mikheev Institute of Metal Physics, Ural Branch of the RAS

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

L. A. Stashkova

Mikheev Institute of Metal Physics, Ural Branch of the RAS

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

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Supplementary files

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2. Fig. 1. X-ray diffraction patterns of the Cu–39.5%Zn alloy after quenching (a), annealing at 250°C for 2 h (b), cold rolling (c), additional annealing at 250°C for 2 h (d) and 500°C for 10 min (d) and the corresponding bar diagrams of the hkl reflections of the α(FCC)-, 3R-, 9R- and β(BCC)-phases.

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3. Fig. 2. DSC curves of the Cu–39.5%Zn alloy after quenching (curve 1) and cold rolling (curve 2). Downward-pointing arrows indicate endothermic effects, upward-pointing arrows indicate exothermic effects.

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4. Fig. 3. OM- (a, b, d) and SEM- (c, d, e) images of the Cu–39.5%Zn alloy after quenching (a), cold rolling (b, c), additional annealing at 250°C, 2 h (d) and 500°C, 10 min (d, e). In Fig. 3d, the arrows indicate new recrystallized fine grains.

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5. Fig. 4. Light- (a) and dark-field (b, d) TEM images and the corresponding microelectron diffraction pattern (c – the axis of the zone of the reflecting planes, r.z., is close to [110]3R||[001]9R) of the Cu–39.5%Zn alloy after cold rolling. The dark-field image of the β-phase nanoparticles in Fig. 4d (marked with arrows) was obtained in the reflections of the 110β-bcc and 111α-phase types, marked with a circle in Fig. 4c.

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6. Fig. 5. Deformation curves σ–δ of the Cu–39.5%Zn alloy after cold rolling (curve 1) and additional heat treatment at 250°C, 2 h (curve 2) or 500°C, 10 min (curve 3).

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7. Fig. 6. SEM images of fractures of Cu–39.5%Zn alloy after cold rolling (a) and additional annealing at 250°C for 2 h (b).

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