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While much research has focused on optimizing the deposition parameters to achieve fully densified specimens , subsequent heat treatments and their effect on the microstructure also need to be understood .
 research, deposition, densified, heat treatments, microstructure, be
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:
 research, deposition, densified, heat treatments, microstructure, be