THE INFLUENCE OF EQUAL CHANNEL ANGULAR PRESSING ON THE STRUCTURE AND MECHANICAL PROPERTIES OF MAGNESIUM Mg-Zn-Ca ALLOYS


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Abstract

Due to its close to the ideal straight-to-density ratio and good biocompatibility, the Mg-Zn-Ca system is the advanced alloy among the magnesium alloys, which are considered for the potential use as the medical implants. However, despite the significant progress in the development of biocompatible magnesium alloys, their technological plasticity is still insufficient and many of their properties are still uninvestigated. In order to increase the plasticity, various methods of structure management by means of grain refining and creation of special proeutectoid constituent distribution are being actively developed lately, which are based on the application of thermomechanical processing including the severe plastic deformation. In this paper, the authors studied the influence of severe plastic deformation using the method of equal channel angular pressing on the structure and properties of Mg-4Zn-0,16Ca and Mg-4Zn-0,56Ca magnesium alloys.

It was found that the increase of calcium content in the initial state leads to the increase of second phases volume fraction. At the same time, the proeutectoid constituent precipitate contains the elevated concentration of the major alloying elements – zinc and calcium.

After the equal channel angular pressing, even at a relatively high homologous deformation temperature, it is impossible to obtain a uniform recrystallized microstructure. The obtained microstructure is bimodal; it consists of relatively fine grains and large non-recrystallized grains. The authors notice that the Mg-4Zn-0,56Ca alloy exhibits the significant increase in tensile mechanical properties to the level of the top-ranking high-strength alloys of this class. It can be explained by the peculiarities of the bimodal grain structure and, probably, by the peculiarities of the crystallographic texture.

About the authors

Aleksey Yurievich Vinogradov

Togliatti State University, Togliatti

Author for correspondence.
Email: alexei.vino@gmail.com

Doctor of Sciences (Engineering), PhD (Physics and Mathematics), Deputy Director of the Research Institute of Progressive Technologies

Russian Federation

Evgeniy Viktorovich Vasiliev

Togliatti State University, Togliatti

Email: avellko@yandex.ru

junior researcher of the Research Institute of Progressive Technologies

Russian Federation

Mikhail Leonidovich Linderov

Togliatti State University, Togliatti

Email: dartvi@gmail.com

junior researcher of the Research Institute of Progressive Technologies

Russian Federation

Dmitriy Lvovich Merson

Togliatti State University, Togliatti

Email: D.Merson@tltsu.ru

Doctor of Sciences (Physics and Mathematics), Professor, Director of the Research Institute of Progressive Technologies

Russian Federation

Elena Olegovna Rzhevskaya

Togliatti State University, Togliatti

Email: u.e.o@mail.ru

junior researcher of the Research Institute of Progressive Technologies

Russian Federation

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