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3.3 Nickel-based superalloys Nickel-based superalloys are the second most popular material studied by the additive manufacturing research community after titanium alloys , mainly due to their high strengths at elevated temperatures and high fabrication cost using traditional methods .
 material: Nickel-based superalloys; material: superalloys; material: material; manufacturing process: additive manufacturing; material: titanium alloys; machanical property: strengths; process parameter: temperatures; manufacturing process: fabrication
Please list all entity words in the text that fit the category.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} 
Answer:
 material: Nickel-based superalloys; material: superalloys; material: material; manufacturing process: additive manufacturing; material: titanium alloys; machanical property: strengths; process parameter: temperatures; manufacturing process: fabrication