Microstructure, mechanical and corrosion properties of ultrafine-grained Mg-2%Sr alloy

6th International Conference on Nanomaterials and Materials Engineering

Kulyasova, O.B.^1,2 ; Islamgaliev, R.K.^1 ; Parfenov, E.V.^3 ; Zheng, Y.F.^4 ; Valiev, R.Z.^1,2

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 Karl Marx Street, Ufa

450008, Russia^1

Saint Petersburg State University, 7/9 Universitetskaya nab., St.Petersburg

199034, Russia^2

Department of Theoretical Basis of Electrical Engineering, Ufa State Aviation Technical University, 12 Karl Marx Street, Ufa

450008, Russia^3

College of Engineering, Peking University, 5 Yi-He-Yuan Road, Hai-Dian District, Beijing, China^4

关键词: Additional annealing;    Bi-modal structures;    High pressure torsions;    Mechanical and corrosion properties;    Scanning and transmission electron microscopy;    Ultimate tensile strength;    Ultra-fine-grained;    Uniform distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/380/1/012014/pdf
DOI  :  10.1088/1757-899X/380/1/012014

来源: IOP

【 摘 要 】

Thermal stability of microstructure of the magnesium alloy Mg-2%Sr processed by high pressure torsion has been studied using scanning and transmission electron microscopy. It was shown that formation of bimodal structure after additional annealing at a temperature of 200°C leads to demonstration of enhanced ultimate tensile strength (245 MPa) with a ductility of 1.5%. In addition a uniform distribution of eutectic phase in bimodal structure led to a slowing down of the corrosion rate to 2% for 31 days (compared to the initial state of 78% for the same period).