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The microstructure evolution in Fe-Co is discussed in the context of classical solidification theory and selective grain boundary pinning processes .
 microstructure evolution, solidification, grain boundary, processes
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:
 microstructure evolution, solidification, grain boundary, processes