MICROSTRUCTURE AND PROPERTIES OF METASTABLE (α+β) SHAPE MEMORY ALLOY Cu–41 WT.%Zn SUBJECTED TO CRYOTHERMAL AND MECHANOCYCLING

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Structural and phase transformations and properties of (a+b) Cu–41 wt%Zn shape memory alloy were studied depending on cryothermal and mechanocycling modes. The temperatures of the start and finish of the direct and reverse martensitic transformations are determined by the temperature dependences of elec-trical resistance. The mechanical properties were measured in mechanocyclic tensile tests in austenitic and martensitic states. Methods of optical, scanning and transmission electron microscopy and X-ray phase analysis were used in structural studies. An increase in the critical temperatures of the start of direct and reverse thermoelastic martensitic transformations (by no more than 25°) with an increase in the number of thermal cycles “cooling–heating” was revealed. An increase in tweed contrast on electron microscopic images and diffuse effects on electron diffraction patterns on B2-austenite is shown with an increase in the number of cryothermocycles. An increase in dislocation density due to phase locking during thermal cycling was found. The low-temperature effect of ferroelasticity in the alloy has been established.

 

作者简介

Nataliya Kuranova

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

编辑信件的主要联系方式.
Email: kuranova@imp.uran.ru
ORCID iD: 0000-0002-5330-7909

кандидат физико-математических наук, старший научный сотрудник, лаборатория цветных сплавов

俄罗斯联邦, Ekaterinburg, 620108 Russia

Vyacheslav Marchenkov

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

Email: march@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620108 Russia

Vladimir Pushin

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Science

Email: pushin@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620108 Russia

Dmitriy Rasposienko

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

Email: rasposienko@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620108 Russia

Alexey Svirid

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

Email: svirid@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620108 Russia

Sergey Afanas'ev

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

Email: asv987@mail.ru
俄罗斯联邦, Ekaterinburg, 620108 Russia

Bogdan Fominykh

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

Email: bogdan.fominyh@mail.ru
俄罗斯联邦, Ekaterinburg, 620108 Russia

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