The effect of high-pressure torsion on the microstructure and properties of magnesium

7th International Conference on Nanomaterials by Severe Plastic Deformation

Figueiredo, Roberto B.^1,2 ; Sabbaghianrad, Shima^2 ; Langdon, Terence G.^2,3

Department of Materials Engineering and Civil Construction, Universidade Federal de Minas Gerais, Belo Horizonte, MG

31270-901, Brazil^1

Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles

CA

90089-1453, United States^2

Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton

SO17 1BJ, United Kingdom^3

关键词: Coarse grains;    Effect of high pressure;    High pressure torsions;    Magnesium and its alloys;    Microstructure and properties;    Processed materials;    Processing operations;    Ultrafine grained structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012039/pdf
DOI  :  10.1088/1757-899X/194/1/012039

来源: IOP

【 摘 要 】

High-pressure torsion provides the opportunity to introduce significant plastic strain at room temperature in magnesium and its alloys. It is now established that this processing operation produces ultrafine-grained structures and changes the properties of these materials. The present paper shows that the mechanism of grain refinement differs from f.c.c. and b.c.c. materials. It is shown that fine grains are formed at the grain boundaries of coarse grains and gradually consume the whole structure. Also, the processed material exhibits unusual mechanical properties due to the activation of grain boundary sliding at room temperature.