Abstract：Y2O3 was mechanical milled by planetary ball mill and its particle size, morphology and the microstructure evolution were systematically investigated by XRD, SEM and TEM. The results show that raw Y2O3 powder has cubic structure, and undergoes crushing, flaky and structure transforming during mechanical milling because of the collision effects of high energy milling balls. Raw Y2O3 powder with bimodal distribution is crushed, refined and dispersed completely, and its particle size shows a single peak and lognormal distribution after mechanical milling for 60 h. The cubic structure Y2O3 powder was destroyed and formed small scaled lattice defects during mechanical milling. The lattice defects region expands to a composite structure which consist of amorphous and nano-grains, and finally completely transformed into amorphous structure. The Y2O3 powders transform to irregular bulk structure and short rod structure after mechanical milling for 60 h. The irregular bulk structure is composite structure which consist of amorphous matrix and a few nano-grains, and the short rod structure is completely amorphous.
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2019, Vol. 24 
