The compressive deformation behavior in the longitudinal direction of graded Ti–6Al–4V meshes fabricated by electron beam melting was investigated using experiments and finite element methods(FEM).The results indicate that the overall strain along the longitudinal direction is the sum of the net strain carried by each uniform mesh constituent and the deformation behavior fits the Reuss model well. The layer thickness and the sectional area have no effect on the elastic modulus, whereas the strength increases with the sectional area due to the edge effect of each uniform mesh constituent. By optimizing3 D graded/gradient design, meshes with balanced superior properties, such as high strength, energy absorption and low elastic modulus, can be fabricated by electron beam melting.
Shangzhou ZhangCong LiWentao HouShuo ZhaoShujun Li
Oxide nanotubes with different diameters and lengths were fabricated on the biomedical Ti2448 alloy by anodic oxidation in neutral electrolyte.Similar to oxide nanotubes fabricated on pure titanium and its alloys,the as-grown nanotubes on Ti2448 also exhibit gradually changing chemical distribution along the direction of tube growth.Furthermore,several kinds of oxides with different valence states(MxOy)are formed simultaneously for each alloying element M,while their volume fractions vary gradually along the tube-growth direction.The findings of this study would provide insight into the effect of valence states on the desired nanotube properties and help develop ways to enhance the properties of the preferred oxide.
Xiaoli ZhaoMeilin DaiShujun LiYulin HaoRui YangLei WangYandong Liu
