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The SLM Ti6Al4V part exhibited fully acicular martensitic microstructure in contrast with α + β microstructure in the Ti6Al4V feedstock , while the grain structure of the CS Al part had no significant change as compared with the Al feedstock .
 manufacturing process: SLM; concept or principle: microstructure; concept or principle: microstructure; material: Ti6Al4V feedstock; concept or principle: grain structure; material: Al; material: as; material: Al
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:
 manufacturing process: SLM; concept or principle: microstructure; concept or principle: microstructure; material: Ti6Al4V feedstock; concept or principle: grain structure; material: Al; material: as; material: Al