The Qaidam Basin, located in the northern margin of the Qinghai-Tibet Plateau, is a large Mesozoic-Cenozoic basin, and bears huge thick Cenozoic strata. The geologic events of the Indian- Eurasian plate-plate collisio...The Qaidam Basin, located in the northern margin of the Qinghai-Tibet Plateau, is a large Mesozoic-Cenozoic basin, and bears huge thick Cenozoic strata. The geologic events of the Indian- Eurasian plate-plate collision since -55 Ma have been well recorded. Based on the latest progress in high-resolution stratigraphy, a technique of balanced section was applied to six pieces of northeast- southwest geologic seismic profiles in the central and eastern of the Qaidam Basin to reconstruct the crustal shortening deformation history during the Cenozoic collision. The results show that the Qaidam Basin began to shorten deformation nearly synchronous to the early collision, manifesting as a weak compression, the deformation increased significantly during the Middle and Late Eocene, and then weakened slightly and began to accelerate rapidly since the Late Miocene, especially since the Quaternary, reflecting this powerful compressional deformation and rapid uplift of the northern Tibetan Plateau around the Qaidam Basin.展开更多
The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were investigated.Results show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y phases.The addit...The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were investigated.Results show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y phases.The addition of Cu element promotes the formation of MgZnCu phase,and the amount of MgZnCu phase is increased with the increase in Cu content.Electrochemical and immersion test results show that the corrosion resistance of Mg-3Zn-1Y-xCu alloys is deteriorated after Cu addition,which can be attributed to the influence of the microstructure of alloys and the properties of the formed corrosion product film.The MgZnCu phase with high electrochemical potential accelerates the micro-galvanic corrosion as strong cathodic sites,and the decreased protection effect of the corrosion product film results from the variation in PBR value of the related compounds.展开更多
基金co-supported by the President Fund and Innovation Program of Chinese Academy of Sciences(no.:kzcx2-yw-104)the Chinese National Science Foundation grants(no.:40334038)the Science and Technology Key Project of Ministry of Education of China(no.:306016).
文摘The Qaidam Basin, located in the northern margin of the Qinghai-Tibet Plateau, is a large Mesozoic-Cenozoic basin, and bears huge thick Cenozoic strata. The geologic events of the Indian- Eurasian plate-plate collision since -55 Ma have been well recorded. Based on the latest progress in high-resolution stratigraphy, a technique of balanced section was applied to six pieces of northeast- southwest geologic seismic profiles in the central and eastern of the Qaidam Basin to reconstruct the crustal shortening deformation history during the Cenozoic collision. The results show that the Qaidam Basin began to shorten deformation nearly synchronous to the early collision, manifesting as a weak compression, the deformation increased significantly during the Middle and Late Eocene, and then weakened slightly and began to accelerate rapidly since the Late Miocene, especially since the Quaternary, reflecting this powerful compressional deformation and rapid uplift of the northern Tibetan Plateau around the Qaidam Basin.
基金Fundamental Research Program of Shanxi Province(202203021222188,202303021211166)Central Guiding Science and Technology Development of Local Fund(YDZJSK20231A046)Key Scientific Research Project in Shanxi Province(202102050201003,202203D111001)。
文摘The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were investigated.Results show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y phases.The addition of Cu element promotes the formation of MgZnCu phase,and the amount of MgZnCu phase is increased with the increase in Cu content.Electrochemical and immersion test results show that the corrosion resistance of Mg-3Zn-1Y-xCu alloys is deteriorated after Cu addition,which can be attributed to the influence of the microstructure of alloys and the properties of the formed corrosion product film.The MgZnCu phase with high electrochemical potential accelerates the micro-galvanic corrosion as strong cathodic sites,and the decreased protection effect of the corrosion product film results from the variation in PBR value of the related compounds.
基金Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi(TSTAP)Leading Talents inEmerging Industries of Shanxi Province+1 种基金the Central Special Funds Guiding the Development of local Science and Technology(YDZX20181400002967)GraduateInnovation Project of Shanxi Province(2019SY483)。
