Strain rate sensitivity of mechanical properties of the ZK60 alloy with the high degree of corrosion damage

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Abstract

There is a strong belief that hydrogen absorbed by magnesium alloys during corrosion can cause their stress corrosion cracking. One of the characteristic markers indicating the involvement of diffusible hydrogen into the fracture mechanism of metals is the negative strain rate dependence of the embrittlement degree. Recent studies show that the loss of ductility of the ZK60 alloy specimens subjected to a short-term (1.5 h) pre-exposure in a corrosive medium actually decreases with the increasing strain rate. However, after the removal of corrosion products from the surface of the specimens, the strain rate dependence of the ductility loss becomes positive, which indicates the absence of hydrogen in the bulk of the metal. At short-term exposure in a corrosive environment, the deep penetration of hydrogen into a metal could be limited due to the insufficient time for hydrogen diffusion. The paper studies the mechanical behavior of the ZK60 alloy subjected to a longer (12 h) pre-exposure in a corrosive medium followed by tensile testing in air at various strain rates. The authors consider the effect of strain rate, long-term pre-exposure in a corrosive medium, and subsequent removal of corrosion products on the strength, ductility, stages of work hardening, and localized deformation, as well as on the state of the side and fracture surfaces of specimens. It is established that the ductility loss of the specimens pre-exposed in a corrosive medium for 12 h decreases with the increasing strain rate, regardless of whether the corrosion products have been removed from their surface or not. It is shown that in this case, the negative strain rate dependence of the ductility loss is associated not with hydrogen dissolved in the bulk of a metal but with the presence of severe corrosion damage of the specimens’ surface. An explanation for the effect of corrosion damage on the mechanical properties and their strain rate sensitivity is proposed. 

About the authors

Evgeny D. Merson

Togliatti State University, Togliatti

Author for correspondence.
Email: Mersoned@gmail.com
ORCID iD: 0000-0002-7063-088X

PhD (Physics and Mathematics), senior researcher of the Research Institute of Advanced Technologies

Россия

Vitaly A. Poluyanov

Togliatti State University, Togliatti

Email: vitaliy.poluyanov@gmail.com
ORCID iD: 0000-0002-0570-2584

PhD (Engineering), junior researcher of the Research Institute of Advanced Technologies

Россия

Pavel N. Myagkikh

Togliatti State University, Togliatti

Email: feanorhao@gmail.com
ORCID iD: 0000-0002-7530-9518

junior researcher of the Research Institute of Advanced Technologies

Россия

Dmitry L. Merson

Togliatti State University, Togliatti

Email: D.Merson@tltsu.ru
ORCID iD: 0000-0001-5006-4115

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

Россия

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