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Friction stir additive manufacturing ( FSAM ) was performed successfully using 2 mm thick sheets of 2195-T8 aluminum-lithium alloy .
 concept or principle: Friction; manufacturing process: additive manufacturing; manufacturing process: mm; material: sheets; material: alloy
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:
 concept or principle: Friction; manufacturing process: additive manufacturing; manufacturing process: mm; material: sheets; material: alloy