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Besides , plasticity deterioration of the repaired tensile specimens is mainly attributed to the formation of columnar grain boundary α phases in the weld zone which are considered to be the earliest nucleation sites of microcracks and confirmed by in situ tensile test .
 machanical property: plasticity; machine or equipment: tensile specimens; concept or principle: columnar grain boundary; concept or principle: weld zone; material: be; concept or principle: nucleation; concept or principle: microcracks; concept or principle: in situ
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: plasticity; machine or equipment: tensile specimens; concept or principle: columnar grain boundary; concept or principle: weld zone; material: be; concept or principle: nucleation; concept or principle: microcracks; concept or principle: in situ