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The La2O3 precipitate could act as the effective heterogeneous nucleation site and the NiTi2 or LaNi precipitates could pin the grain boundaries contributing to the grain refinement and the formation of equiaxed grains of NiTi ( B2 ) phase .
 La2O3, as, heterogeneous nucleation, precipitates, grain boundaries, grain refinement, equiaxed grains, NiTi, phase
Please list all entity words in the text that fit the category. Output format is "word1, 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 
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Answer:
 La2O3, as, heterogeneous nucleation, precipitates, grain boundaries, grain refinement, equiaxed grains, NiTi, phase