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In this viewpoint article , we introduce and discuss additive friction stir deposition , which is a fast , scalable , solid-state process that results in refined microstructures and has flexible options for feed materials .
 material: additive; concept or principle: deposition; concept or principle: solid-state process; material: microstructures; process parameter: feed
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:
 material: additive; concept or principle: deposition; concept or principle: solid-state process; material: microstructures; process parameter: feed