2780
The aB-built microstructure features dendritically-arranged nano-crystalline Si particles that are favourable for high hardness , strength and impact toughness while T6 generally caused these properties to degrade .
 concept or principle: microstructure; material: Si; concept or principle: particles; machanical property: hardness; machanical property: strength; concept or principle: impact; concept or principle: properties
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: microstructure, Si, particles, hardness, strength, impact, properties 
Answer:
 concept or principle: microstructure; material: Si; concept or principle: particles; machanical property: hardness; machanical property: strength; concept or principle: impact; concept or principle: properties