Microstructure and mechanical properties of an Mg-3Zn- o.5Zr-5HA nanocomposite processed by ECAE

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Li, J.^1,2 ; Huang, Y.^1

BCAST, Brunel University Kingston Lane, Uxbridge, Middlesex UB8 3PH, United Kingdom^1

National Engineering Research Centre for Special Metal Materials of Tantalum and Niobium, Yejin Road, Shizuishan, Ningxia 753000, China^2

关键词: Equal channel angular extrusion;    In-vitro corrosions;    Mechanical performance;    Mg matrix composites;    Microstructural features;    Microstructure and mechanical properties;    Nanoparticle aggregate;    Particle segregation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012112/pdf
DOI  :  10.1088/1757-899X/63/1/012112

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Mg matrix composites reinforced by natural bone constituent hydroxyapatite (HA) particles have shown promising in-vitro corrosion resistance but are inconsistent in both electrochemical and mechanical performances because of severe particle segregations. The present work was carried out to investigate the feasibility of a novel technology that combines high shear solidification and equal channel angular extrusion (ECAE) for fabricating Mg-HA nanocomposites. Experiments showed that the high shear solidification resulted in a fine and uniform grain structure with a globally uniform HA nanoparticles in fine clusters and the ECAE processing of the as-cast composites resulted in further grain refinement and more importantly the breakdown of nanoparticle aggregates, leading to the formation of a dispersion of true nanoparticles in the Mg alloy matrix with improved mechanical properties. This paper describes mainly the microstructural features and mechanical performance of Mg-3Zn-0.5Zr-xHA (x 1, 3, 5, 10) nanocomposites, in which the HA was in spherical shape with an average diameter of ∼20nm