4017
The microstructural and crystallographic characterization of the LPBF-built Al–2.5Fe alloy samples revealed a characteristic microstructure consisting of multi-scan melt pools that resulted from local melting and rapid solidification owing to laser irradiation during the LPBF process .
 concept or principle: microstructural; material: alloy; concept or principle: microstructure; material: melt pools; manufacturing process: melting; manufacturing process: rapid solidification; enabling technology: laser; manufacturing process: irradiation; manufacturing process: LPBF
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: microstructural, alloy, microstructure, melt pools, melting, rapid solidification, laser, irradiation, LPBF 
Answer:
 concept or principle: microstructural; material: alloy; concept or principle: microstructure; material: melt pools; manufacturing process: melting; manufacturing process: rapid solidification; enabling technology: laser; manufacturing process: irradiation; manufacturing process: LPBF