9390
In this research work , a short review on additive manufacturing of Ti-6Al-4V alloys has been investigated to define its mechanical and metallurgical properties in both aB-built and heat treated conditions .
 concept or principle: research; manufacturing process: additive manufacturing; material: Ti-6Al-4V alloys; application: mechanical; application: metallurgical; concept or principle: heat
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: research, additive manufacturing, Ti-6Al-4V alloys, mechanical, metallurgical, heat 
Answer:
 concept or principle: research; manufacturing process: additive manufacturing; material: Ti-6Al-4V alloys; application: mechanical; application: metallurgical; concept or principle: heat