Anisotropic Compression Behavior of Additively Manufactured Porous Titanium with Ordered Open-Cell Structures at Different Temperatures

Anisotropic compression behavior of open-cell porous titanium is evaluated at different temperatures. Porous titanium specimens with truncated octahedron unit cells are designed by 3D-Voronoi division. Cubic specimens with the porosities of 85 and 92% are manufactured from commercially pure titanium powder using an electron beam melting process. Compression tests are carried out at different temperatures of 300, 473 and 673K for three different compression directions of [001], [011] and [111]. In all specimens, the flow stress of [001] direction is highest and the flow stress of [111] direction is lowest. Anisotropic compressive strength can be explained by comparing the bending moment of cell struts. Activation energy obtained by Arrhenius plot is the same as that of base titanium and is independent of the compression direction.