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The joints composed of B2 + O phase exhibited higher tensile strength compared with the aB-welded joints due to the strengthening effects of O phase .
 material: O; machanical property: tensile strength; manufacturing process: strengthening; material: O
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: O; machanical property: tensile strength; manufacturing process: strengthening; material: O