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Parameters for selective laser melting of Zr59.3Cu28.8Al10.4Nb1.5 ( trade name AMZ4 ) , allowing crack-free bulk metallic glass with low porosity , have been developed .
 Parameters, selective laser melting, metallic glass, porosity
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:
 Parameters, selective laser melting, metallic glass, porosity