4014
The melt pool depth , relative density , and hardness of LPBF-fabricated Al–2.5Fe alloy samples under different laser power ( P ) and scan speed ( v ) conditions were systematically examined .
 process parameter: melt pool depth; machanical property: relative density; machanical property: hardness; material: alloy; process parameter: laser power; material: P; process parameter: scan speed; material: v
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: melt pool depth, relative density, hardness, alloy, laser power, P, scan speed, v 
Answer:
 process parameter: melt pool depth; machanical property: relative density; machanical property: hardness; material: alloy; process parameter: laser power; material: P; process parameter: scan speed; material: v