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For static tensile tests , lower ductility was observed experimentally for the horizontal specimens in comparison with vertical samples this could be attributed to long prior beta-grain boundaries in Ti6Al4V which grow in the build direction and are hence perpendicular to the loading direction in horizontal specimens .
 process characterization: tensile tests; machanical property: ductility; biomedical: horizontal specimens; concept or principle: vertical samples; material: be; engineering feature: boundaries; material: Ti6Al4V; process parameter: build direction; biomedical: horizontal specimens
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:
 process characterization: tensile tests; machanical property: ductility; biomedical: horizontal specimens; concept or principle: vertical samples; material: be; engineering feature: boundaries; material: Ti6Al4V; process parameter: build direction; biomedical: horizontal specimens