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The mechanism of stress during uniaxial tension on EBM base metal is discussed based on the stress state of columnar grains and the internal defects .
 concept or principle: mechanism; machanical property: stress; manufacturing process: EBM; material: base metal; machanical property: stress; machanical property: columnar grains; concept or principle: defects
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: mechanism; machanical property: stress; manufacturing process: EBM; material: base metal; machanical property: stress; machanical property: columnar grains; concept or principle: defects