Mechanical Properties and Fracture Mechanism of Porous Ti6Al4V (ELI) Alloy Fabricated by Selective Laser Melting
LI Qing1,2, ZHAO Guorui1, MA Wenyou1, YU Hongya2, LIU Min1
1 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China; 2 Key Laboratory of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China
Abstract: In order to investigate the influence of structural parameters such as porosity and strut diameter on the tensile properties of porous Ti6Al4V (ELI) alloy, octahedral porous Ti6Al4V (ELI) alloy was precisely fabricated by selective laser melting. The tensile test of porous Ti6Al4V (ELI) alloy with different structural parameters was carried out at room temperature, the fracture morphology of the alloy was observed by scanning electron microscopy to reveal the failure mechanism in tension. Results show that tensile strength and elongation increase with the increase of strut thickness when the porosity is the same, while mechanical properties decrease with the increase of porosity when with similar strut thickness. The massive terraces and few dimples at the fracture surface indicate the brittle and ductile fracture mechanism of the SLM-ed Ti6Al4V (ELI) alloy.
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2020, Vol. 34 
