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Title of article :
Compression deformation behavior of Ti–6Al–4V alloy with cellular structures fabricated by electron beam melting
Author/Authors :
Cheng، نويسنده , , X.Y. and Li، نويسنده , , S.J. and Murr، نويسنده , , L.E. and Zhang، نويسنده , , Z.B. and Hao، نويسنده , , Y.L. and Yang، نويسنده , , R. Vazquez-Medina، نويسنده , , F. and Wicker، نويسنده , , R.B.، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2012
Pages :
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Abstract :
Ti–6Al–4V alloy with two kinds of open cellular structures of stochastic foam and reticulated mesh was fabricated by additive manufacturing (AM) using electron beam melting (EBM), and microstructure and mechanical properties of these samples with high porosity in the range of 62%∼92% were investigated. Optical observations found that the cell struts and ligaments consist of primary α′ martensite. These cellular structures have comparable compressive strength (4∼113 MPa) and elastic modulus (0.2∼6.3 GPa) to those of trabecular and cortical bone. The regular mesh structures exhibit higher specific strength than other reported metallic foams under the condition of identical specific stiffness. During the compression, these EBM samples have a brittle response and undergo catastrophic failure after forming crush band at their peak loading. These bands have identical angle of ∼45 ° with compression axis for the regular reticulated meshes and such failure phenomenon was explained by considering the cell structure. Relative strength and density follow a linear relation as described by the well-known Gibson–Ashby model but its exponential factor is ∼2.2, which is relative higher than the idea value of 1.5 derived from the model.
Keywords :
electron beam melting , Stochastic foam , Reticulated mesh , Compressive deformation behavior , Titanium alloys
Journal title :
Journal of the Mechanical Behavior of Biomedical Materials
Journal title :
Journal of the Mechanical Behavior of Biomedical Materials
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Link To Document :