Effect of multiaxial forging on microstructure and mechanical properties of Mg-o.8Ca alloy

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Yurchenko, N. Yu^1 ; Stepanov, N.D.^1 ; Salishchev, G.A.^1 ; Rokhlin, L.L.^2 ; Dobatkin, S.V.^2

Laboratory of Bulk Nanostructured Materials, Belgorod State University, 85 Pobeda Str., Belgorod 308015, Russia^1

A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49 Leninskii pr., 119991, Moscow, Russia^2

关键词: Average grain size;    Coarse structure;    Elongation to fracture;    Homogenized state;    Microstructure and mechanical properties;    Multiaxial forging;    Tensile yield strength;    Ultimate tensile strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012075/pdf
DOI  :  10.1088/1757-899X/63/1/012075

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

It was shown that multiaxial forging with continuous decrease of temperature from 450°C to 250°C turns coarse structure of the Mg-0.8Ca alloy in homogenized state with grain size of several hundreeds gm into fine structure with average grain size of about 2.1 gm. Refinement of structure is accompanied by drastic increase of mechanical properties: tensile yield strength increases from 50 MPa to 193 MPa, ultimate tensile strength increases from 78 to 308 MPa and elongation to fracture increases from 3.0% to 7.2%. The microstructural evolution during multiaxial forging is studied using optical microscopy, scanning electron microscopy and EBSD analysis. The mechanisms responsible for refinement of microstructure are discussed