Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 31, Issue 1, Pages 167-177Publisher
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DOI: 10.1016/S1003-6326(20)65485-1
Keywords
Ti-6Al-4V alloy; selective laser melting; microstructure; electrochemical corrosion behavior
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Funding
- National Key R&D Program of China [2017YFB1104100]
- New Young Teachers Initiation Plan, China [18X100040027]
- National Natural Science Foundation of China [51971142]
- China Postdoctoral Science Foundation [19Z102060057]
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Ti-6Al-4V alloy fabricated via selective laser melting shows better corrosion resistance than wrought samples due to its unique microstructure and uniform distribution of alloying elements.
Ti-6Al-4V alloy was fabricated via selective laser melting (SLM) to improve its corrosion resistance for implant. The microstructure and electrochemical corrosion behavior were investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), electrochemical test and contact angle test. It can be found that the as-selective laser melted (as-SLMed) Ti-6Al-4V alloys show beta columnar microstructure in building direction and nearly circular checkerboard microstructure in scanning direction, while the wrought and wrought+HT samples exhibit equiaxed microstructure. The as-SLMed Ti-6Al-4V alloy exhibits better corrosion resistance than the wrought and wrought+HT samples due to hydrophobicity, high grain boundary density and uniform distribution of alloying elements in simulated artificial saliva at 37 degrees C.
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