4617
Significant precipitation of γ′′ phase was observed after HIP + HT , which was attributed to the two-step aging heat treatment carried out during HIP + HT .
 concept or principle: precipitation; concept or principle: phase; manufacturing process: HIP; manufacturing process: heat treatment; manufacturing process: HIP
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: precipitation, phase, HIP, heat treatment, HIP 
Answer:
 concept or principle: precipitation; concept or principle: phase; manufacturing process: HIP; manufacturing process: heat treatment; manufacturing process: HIP