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Then , we succeeded in eliminating the inhomogeneities , modifying the phase structures and refining grain sizes via comprehensive post-production heat treatment regimes , which provides a valuable implication for improving the reliabilities of AM-built metals and alloys .
 phase, grain sizes, heat treatment, metals, alloys
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:
 phase, grain sizes, heat treatment, metals, alloys