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At present , several studies have focused on hybrid manufacturing and enhancing the mechanical properties of Ti-6Al-4V with additive manufacturing techniques .
 hybrid manufacturing, mechanical properties, Ti-6Al-4V, additive manufacturing
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:
 hybrid manufacturing, mechanical properties, Ti-6Al-4V, additive manufacturing