Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

The implications of retained strain on in vitro and in vivo degradation behavior as well as cytocompatibility of the Mg− 4Zn−0.5Ca−0.8Mn alloy is comprehensively studied. The retained strain is induced in homogenized specimens by hard-plate hot forging (HPHF) at a temperature (523 K) lower than the recrystallization temperature of the alloy. The retained strain generated during deformation process deteriorated the corrosion response of the deformed alloy as compared to its homogenized counterpart. The strained area of deformed specimen with high dislocation density promoted defect generation (oxygen vacancies) in the film and facilitated preferential migration of ions, consequently leading to formation of a nonuniform product film with low protectiveness. In addition to strain magnitude, the distribution of retained strain also influenced the product film properties in the deformed specimens. An even distribution of retained strain improved the uniformity of the product film to certain extent by providing greater film coverage, resulting in higher film resistance. After 24 h of immersion, the protectiveness of the film was further improved in this specimen due to annihilation of defects through homogeneous ionic migration, which led to the development of a uniform and stable film that restricted further ionic diffusion. The dissolution of Zn(OH) 2 into Zn 2+ ions was promoted at lower pH, resulting in enhanced antimicrobial activity in the specimen with the lowest degradation. Besides, the specimen with stable product film not only minimized the rate of further degradation but also served as an interface for new bone growth, as evident from in vivo studies.

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Mechanochemical study of a novel Magnesium alloy with trace addition of Gd, Nd, Ce, and La rare-earth and Sr elements

Moradi,

Bahmani,

Malekan

et al. 2024

Materials Science and Technology

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Mg-Zn-Ca-Mn materials micro-alloyed by Gd, Nd, Ce, and La rare-earth and Sr alkaline elements were developed. Optical and scanning electron microscopy, X-ray diffraction spectroscopy, tensile test, immersion, and electrochemical tests were applied to analyze microstructure, mechanical properties, and corrosion behavior. While the development of the equiaxed grain structures were observed in all the alloys, the Gd-containing alloy showed the smallest grain size and lowest fraction of second phases, which resulted in the highest yield and ultimate tensile strength of 310.0 ± 14.1 and 370.4 ± 41.6 MPa, respectively. Moreover, the corrosion studies also indicated the lowest rates in the Gd, and Nd-containing alloys, with the rates of 3.6 ± 2.5 and 3.9 ± 0.2 mm/y, respectively. The mechanisms of microstructure evolution, strengthening and corrosion behavior were discussed.

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Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Cited by 4 publications

References 67 publications

Impact of the Rare Earth Element La on the Microstructure and Mechanical Properties of the Al/Steel Bimetallic Composite Interface Fabricated by Liquid–Solid Casting

Impact of the Rare Earth Element La on the Microstructure and Mechanical Properties of the Al/Steel Bimetallic Composite Interface Fabricated by Liquid–Solid Casting

Effect of Thermomechanical Processing Induced Retained Strain on In Vitro, In Vivo Biodegradation Response and Cytocompatibility of Mg Alloy

Mechanochemical study of a novel Magnesium alloy with trace addition of Gd, Nd, Ce, and La rare-earth and Sr elements

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