Preparation of Freestanding Zn Nanocrystallites by Combined Milling at Cryogenic and Room Temperatures
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The present investigation reports the preparation of freestanding nanocrystalline Zn by combined mechanical milling at cryogenic and room temperatures. The cryomilling is used as an effective means of rapid fracturing. The detailed scanning electron microscopy and transmission electron microscopy observations indicate that the minimum crystallite size is 6 ± 2 nm after 3 hours of cryomilling. The crystallite size increases to 30 ± 2 nm after 3 hours of room temperature milling of the cryomilled powder due to deformation-induced sintering. Detailed theoretical analysis allows us to obtain a diagram of size of the nanoparticles formed vs temperature to explain the experimental findings.
KeywordsMilling Crystallite Size Shear Band Mechanical Milling High Magnification Micrograph
The authors thank the Convener of Institute Nanoscience Initiative, Indian Institute of Science, Bangalore, for allowing use of the microscopy facility for characterization for this article’s work. The authors also thank the Nanoscience and Technology Initiatives (NSTI), Department of Science and Technology, Government of India, for financial support.
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