Frontier Materials & TechnologiesFrontier Materials & TechnologiesFrontier Materials & Technologies2782-40392782-6074Togliatti State University82010.18323/2782-4039-2023-1-45-55ArticlesСтатьиStrain rate sensitivity of mechanical properties of the ZK60 alloy with the high degree of corrosion damageСкоростная чувствительность механических свойств сплава ZK60 с высокой степенью коррозионных поврежденийhttps://orcid.org/0000-0002-7063-088XMersonEvgeny D.МерсонЕвгений Дмитриевич
Russian Federation

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

кандидат физико-математических наук, старший научный сотрудник НИИ прогрессивных технологий

Mersoned@gmail.comhttps://orcid.org/0000-0002-0570-2584PoluyanovVitaly A.ПолуяновВиталий Александрович
Russian Federation

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

кандидат технических наук, младший научный сотрудник НИИ прогрессивных технологий

vitaliy.poluyanov@gmail.comhttps://orcid.org/0000-0002-7530-9518MyagkikhPavel N.МягкихПавел Николаевич
Russian Federation

junior researcher of the Research Institute of Advanced Technologies

младший научный сотрудник НИИ прогрессивных технологий

feanorhao@gmail.comhttps://orcid.org/0000-0001-5006-4115MersonDmitry L.МерсонДмитрий Львович
Russian Federation

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

доктор физико-математических наук, профессор, директор НИИ прогрессивных технологий

D.Merson@tltsu.ruTogliatti State University, TogliattiТольяттинский государственный университет, Тольятти31032023145553103202331032023https://vektornaukitech.ru/jour/article/view/820

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. 

Существует устойчивое мнение, что водород, поглощаемый магниевыми сплавами в процессе коррозии, может вызывать их коррозионное растрескивание под напряжением. Одним из характерных признаков участия диффузионно-подвижного водорода в механизме разрушения металлов является отрицательная скоростная зависимость степени охрупчивания. В недавних исследованиях было показано, что потеря пластичности образцов сплава ZK60, подвергнутых кратковременному (1,5 ч) воздействию коррозионной среды, действительно уменьшается с ростом скорости деформации. Однако после удаления продуктов коррозии с поверхности образцов скоростная зависимость потери пластичности становится положительной, что свидетельствует об отсутствии водорода в объеме металла. При кратковременной выдержке в коррозионной среде глубокое проникновение водорода в металл могло быть ограничено недостаточным для диффузии водорода временем. В работе исследовано механическое поведение сплава ZK60, подвергнутого более длительной (12 ч) предварительной выдержке в коррозионной среде с последующим испытанием на растяжение в атмосфере воздуха при различных скоростях деформации. Рассмотрено влияние скорости деформирования, длительной выдержки в коррозионной среде и последующего удаления продуктов коррозии на прочность, пластичность, стадии деформационного упрочнения и локализованной деформации, а также на состояние боковой поверхности и изломов образцов. Установлено, что потеря пластичности образцов, выдержанных в течение 12 ч в коррозионной среде, уменьшается с ростом скорости деформирования независимо от того, были удалены продукты коррозии с их поверхности или нет. Показано, что в данном случае отрицательная скоростная зависимость потери пластичности связана не с водородом, растворенным в объеме металла, а с наличием глубоких коррозионных повреждений поверхности образцов. Предложено объяснение влияния коррозионных повреждений на механические свойства и чувствительность этих свойств к изменению скорости деформации.

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