Lattice structures have attracted significant attention as novel energy-absorbing structures; however, regular lattice anisotropic properties. To make the energy absorption properties isotropic, irregularization of may be effective. However, irregularity effect on amount is unclear. Therefore, in this study, irregularities were introduced into comprising struts, and effects isotropy compressive investigated. The designed using a three-dimensional Voronoi partitioning method, controlled by...

Mechanical properties of open-cell titanium foams with different cell geometries (truncated octahedron and rhombic dodecahedron cells) were examined through compressive tests. These manufactured the electron beam melting (EBM) process. The behavior depends on porosity, geometry orientation. Titanium truncated cells showed high strength compared to those cells. This is due short edges in In addition, parallel oblique against compression direction are effective increase strength. Macroscopic...

The Yb 2 O 3 –Fe system was studied to investigate the effect of oxygen partial pressure on formation metastable phases over a wide range pressures from 10 5 −1 Pa. Two kinds phases, with space groups P 6 cm and / mmc , were found through rapid solidification an undercooled YbFeO melt in atmosphere reduced o . crystal structure as‐solidified samples changed orthorhombic Pbnm hexagonal decreasing X‐ray diffractometric scanning electron microscopic results confirmed existence various samples....

The effect of fluidity on open cell AZ31 metal foam samples fabricated using a solid state space holder method was investigated. Granule by plaster powder and perlite powder. Granules were sieved which compacted layer in casting mold. Preforms made granules then heated to 200 °C, 300 400 500 °C under rough (mechanical) vacuum before pressure infiltration with Mg alloy. Samples infiltrated values range 8–14 KPa. conditions temperature performed order get different manufacturer specimen...

Closed-cell Al-Si alloy foam was produced from two bulk strips. Preform sheet containing titanium hydride (TiH2) particles first manufactured through accumulative roll-bonding (ARB) processing. Large ARB cycle number effective to achieve uniform distribution of the TiH2 in matrix. Following high temperature foaming tests revealed that porosity and small pore size can be obtained preform prepared large number. These results indicate a suitable processing condition enables optimize cell...

Metal foams are attractive materials for thermal insulators because of their low conductivity. Coefficient expansion (CTE) metal is the same as that cell wall materials. Therefore, effect stress induced by a change in CTE, which severe barrier coating ceramics, becomes negligible. In this study, we focus on designing insulators. The porosity and pore shape conductivity was calculated micromechanical analysis. It revealed oblate spheroidal pores effective to decrease Micromechanical analysis...

The deformation behaviour of high-purity aluminium at low temperatures was investigated in order to re-examine Ashby-type mechanism map. All specimens with different purities showed significant creep below room temperature. Under the same stress and temperature, steady-state rate increased increasing purity material. They exponents around 5.0 apparent activation energies 20 kJ/mol about 400 K, 4.0 70–80 above that grain size had no effect temperature region. From microstructural observation,...

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

Additive manufacturing (AM) technology enables to manufacture many types of porous aluminum alloys. Present study focusses on AM Al–4.8Mg–0.7Sc alloys manufactured through laser powder bed fusion process. Eight ordered cell structures are designed by 3D-Voronoi division. consisting cells show anisotropic compression behavior. Oscillated stress-strain curves due the heterogeneous deformation struts. Post-annealed alloy shows excellent mechanical properties compared post-annealed Al–10Si–0.3Mg...

The effects of freeze–thaw (FT) cycles on the mode I fracture toughness adhesively bonded carbon fiber reinforced plastic joints were studied. Fracture specimens immersed in water and exposed to thermal consisting thawing (+60 °C) freezing (−50 °C). Two types specimen prepared: those without mechanical loading (non-stressed) with using a wedge (stressed) during environmental conditioning. non-stressed gradually decreased increasing number FT cycles, whereas that stressed first increased then...

This paper reports improved mechanical properties of AZ91 magnesium alloy at room temperature. Titanium particles dispersed composite is produced through accumulative diffusion bonding (ADB) process. Vickers hardness, ultimate tensile strength and 0.2% proof stress increased with increasing the amount titanium particles. The 2.0% Ti by ADB process showed significantly high elongation over 30%. Improved ductility would be due to random texture development severe plastic deformation relaxation

Ti6Al4V alloys are widely used as a structural material.Open-cell porous with different porosities manufactured through powder bed fusion process.Cylindrical specimens consisting of ordered truncated octahedron unit-cells designed using 3D-CAD software.After the building, alloy annealed at temperatures 1173 and 1323 K for 1 h in vacuum.Vickers hardness is lower than those as-built specimens.This due to increased volume fraction beta phase which measured by SEM observation X-ray diffraction...

Liquid and semi-solid state foaming processes have been widely used as a manufacturing method of closed-cell metal foams. These foams usually large pores well high porosity. Large inhomogeneous pore distribution often cause decrease in mechanical properties. Therefore, microcellular are desirable for engineering applications. In the present study, solid-state process under superplastic conditions is examined order to manufacture aluminum The flow during temperature accelerates rate increases...