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Refs.. 4.2 Shape memory alloys Shape Memory Alloys are capable of regaining their original shape after severe deformations when stimulated by external environments .
 material: Shape memory alloys; material: Alloys; concept or principle: deformations
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: Shape memory alloys; material: Alloys; concept or principle: deformations