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In contrary to the substantial research on Ti alloys , no reports on the application of topology optimization in the design of SMA scaffolds involving AM fabrication can be found in the literature up to date .
 concept or principle: research; material: Ti alloys; engineering feature: topology optimization; engineering feature: design; biomedical: SMA scaffolds; manufacturing process: AM; material: be
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:
 concept or principle: research; material: Ti alloys; engineering feature: topology optimization; engineering feature: design; biomedical: SMA scaffolds; manufacturing process: AM; material: be