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Using the Fe-Cr-Al ternary as a model system , we compare the phase fields in equilibrium and STeP diagrams to show that intermetallic phase fields are dramatically expanded under the rapid solidification conditions in melt-based additive manufacturing , an important effect that must be accounted for when designing composition gradients .
 Fe-Cr-Al, as, model, phase, equilibrium, STeP diagrams, intermetallic, rapid solidification, additive manufacturing, be, composition gradients
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:
 Fe-Cr-Al, as, model, phase, equilibrium, STeP diagrams, intermetallic, rapid solidification, additive manufacturing, be, composition gradients