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Realizing improved strength in composite metallic materials remains a challenge using conventional welding and joining systems due to the generation and development of brittle intermetallic compounds caused by complex thermal profiles during solidification .
 machanical property: strength; material: composite; concept or principle: materials; manufacturing process: conventional welding; manufacturing process: joining; machanical property: brittle; concept or principle: thermal profiles; concept or principle: solidification
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:
 machanical property: strength; material: composite; concept or principle: materials; manufacturing process: conventional welding; manufacturing process: joining; machanical property: brittle; concept or principle: thermal profiles; concept or principle: solidification