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The results show that the bi-modal grain size distribution observed in the aB-processed condition can be maintained even after a heat treatment , due to a high density of intragranular Al3 ( ScxZr1-x ) precipitates , and various other particles pinning the grain boundaries .
 grain size, distribution, be, heat treatment, density, precipitates, particles, grain boundaries
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 
Text: {0} 
Answer:
 grain size, distribution, be, heat treatment, density, precipitates, particles, grain boundaries