7102
This work shows that a topology-optimized structure fabricated by selective laser melting using commercial-purity titanium ( CP-Ti ) exhibits excellent fatigue properties with an ultra-high normalized fatigue life of ∼0.65 at 106 cycles and at a low density of 1.3 g/cm3 .
 structure fabricated, selective laser melting, titanium, fatigue, fatigue life, density
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 structure fabricated, selective laser melting, titanium, fatigue, fatigue life, density