Zinc(Zn)alloys are emerging as a new class of biodegradable metallic materials due to their good biocompatibility,suitable biodegradability,and nontoxicity.However,the dynamic loading in the human body,along with the ...Zinc(Zn)alloys are emerging as a new class of biodegradable metallic materials due to their good biocompatibility,suitable biodegradability,and nontoxicity.However,the dynamic loading in the human body,along with the corrosive physiological environment,brings great challenges to the application of biodegradable Zn alloys.At present,there are few reports on the fatigue and corrosion fatigue properties of Zn alloys in simulated body fluid(SBF).In the present work,extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were selected in order to systematically evaluate their fatigue and corrosion fatigue behaviors both in air at ambient temperature and in SBF at 37℃.Results revealed that the fatigue limits of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were about 135 and 180 MPa,respectively,in air at ambient temperature.However,the fatigue limits of the two alloys decreased to 65 and 80 MPa,respectively,in SBF at 37℃and showed a linear relationship between the corrosion fatigue life and the stress amplitude.The sources of fatigue cracks in air were internal microstructural defects or weak mechanical properties of the material,while the initiation of corrosion pits on the surface was the main reason for the source of the formation of fatigue cracks in SBF.The fracture mode of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys was quasi-cleavage fracturing.Compared to static immersion testing,cyclic loading significantly increased the corrosion rates of the two experimental alloys in a corrosion fatigue environment.展开更多
China has been developed into one of the most active regions in terms of both fundamental and applied research on magnesium （Mg） and its alloys in the world from a solid base laid by its prominent metallurgist and m...China has been developed into one of the most active regions in terms of both fundamental and applied research on magnesium （Mg） and its alloys in the world from a solid base laid by its prominent metallurgist and materials scientists over the past decades. Nowadays, a large number of young-generation researchers have been inspired by their predecessors and become the key participants in the fields of Mg alloys, which consequently led to the establishment of China Youth Scholar Society for Magnesium Alloys Research in 2015. Since then, the first two China Youth Scholars Symposiums on Mg Alloys Research had been held at Harbin （2015） and Chongqing （2016） China, respectively. A number of crucial research inter- ests related to fundamental and applied Mg research were discussed at the conferences and summarized in this short perspective, aiming to boost far-reaching initiatives for development of new Mg-based materials to satisfy the requirements for a broad range of industrial employments. Herein, four main aspects are included as follows： i） Plastic deformation mechanism and strengthening strategy, ii） Design and development of new Mg-based materials, iii） Key service properties, and iv） New processing technologies.展开更多
基金supported by the National Natural Science Foundation of China(Nos.31700819 and 52071028)the Young Elite Scientists Sponsorship Program by CAST(YESS)(No.2018QNRC001)+1 种基金the Fundamental Research Funds for the Central Universitiesthe Youth Teacher International Exchange&Growth Program(No.QNXM20210021)。
文摘Zinc(Zn)alloys are emerging as a new class of biodegradable metallic materials due to their good biocompatibility,suitable biodegradability,and nontoxicity.However,the dynamic loading in the human body,along with the corrosive physiological environment,brings great challenges to the application of biodegradable Zn alloys.At present,there are few reports on the fatigue and corrosion fatigue properties of Zn alloys in simulated body fluid(SBF).In the present work,extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were selected in order to systematically evaluate their fatigue and corrosion fatigue behaviors both in air at ambient temperature and in SBF at 37℃.Results revealed that the fatigue limits of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were about 135 and 180 MPa,respectively,in air at ambient temperature.However,the fatigue limits of the two alloys decreased to 65 and 80 MPa,respectively,in SBF at 37℃and showed a linear relationship between the corrosion fatigue life and the stress amplitude.The sources of fatigue cracks in air were internal microstructural defects or weak mechanical properties of the material,while the initiation of corrosion pits on the surface was the main reason for the source of the formation of fatigue cracks in SBF.The fracture mode of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys was quasi-cleavage fracturing.Compared to static immersion testing,cyclic loading significantly increased the corrosion rates of the two experimental alloys in a corrosion fatigue environment.
基金support from Chinese Committee for Magnesium and its Application
文摘China has been developed into one of the most active regions in terms of both fundamental and applied research on magnesium （Mg） and its alloys in the world from a solid base laid by its prominent metallurgist and materials scientists over the past decades. Nowadays, a large number of young-generation researchers have been inspired by their predecessors and become the key participants in the fields of Mg alloys, which consequently led to the establishment of China Youth Scholar Society for Magnesium Alloys Research in 2015. Since then, the first two China Youth Scholars Symposiums on Mg Alloys Research had been held at Harbin （2015） and Chongqing （2016） China, respectively. A number of crucial research inter- ests related to fundamental and applied Mg research were discussed at the conferences and summarized in this short perspective, aiming to boost far-reaching initiatives for development of new Mg-based materials to satisfy the requirements for a broad range of industrial employments. Herein, four main aspects are included as follows： i） Plastic deformation mechanism and strengthening strategy, ii） Design and development of new Mg-based materials, iii） Key service properties, and iv） New processing technologies.
