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It is worth noting that the microstructure can be refined to smaller dendritic arm spacing , less niobium segregation and discontinuous Laves phase in the interdendritic regions using post-process heat treatments , which are beneficial to the mechanical properties .
 concept or principle: microstructure; material: be; biomedical: dendritic arm spacing; concept or principle: niobium segregation; concept or principle: Laves phase; concept or principle: post-process heat; concept or principle: mechanical properties
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 concept or principle: microstructure; material: be; biomedical: dendritic arm spacing; concept or principle: niobium segregation; concept or principle: Laves phase; concept or principle: post-process heat; concept or principle: mechanical properties