6484
Evolution of pores ( mean diameter , density , volume fraction and sphericity ) was quantified as a function of plastic strain .
 Evolution, pores, diameter, density, volume fraction, as, plastic
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:
 Evolution, pores, diameter, density, volume fraction, as, plastic