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Additionally , Pv-1/2 , which is based on the deposited energy density model , was found to be a more appropriate parameter for additively manufacturing Al–2.5Fe alloy samples , and using it to simplify the relative densities of the samples made the determination of a threshold value for the laser parameters required to fabricate dense alloy samples .
 energy density, be, parameter, manufacturing, alloy, relative densities, samples, laser, fabricate, 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:
 energy density, be, parameter, manufacturing, alloy, relative densities, samples, laser, fabricate, alloy