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To this end , in this work a combined numerical and experimental approach has been used to analyze the formation , evolution and disappearance of keyhole and keyhole-induced porosities along with their initiating mechanisms , during single track L-PBF of a Ti6Al4V alloy .
 experimental, evolution, porosities, L-PBF, Ti6Al4V alloy
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:
 experimental, evolution, porosities, L-PBF, Ti6Al4V alloy