Abstract
The discovery of solid state processing of nanocrystalline and amorphous metals is considered to be a formation of a vital technology because of the potential in applications of these materials. Among the processes which are suitable tailoring advanced materials, mechanical alloying techniques are of special interest since they offer the most flexibility in mixing the constituent elements. To understand structural transformation from crystalline to amorphous states during mechanical alloying, the microstructural information from TEM is essential. This paper presents three different techniques used in preparing mechanically alloyed powder specimens for TEM study.Samples of commercially produced fine-grained (325 mesh) Cu (99.3%) and Zr (99%) powders were weighed to an atomic ratio of 1:1 as starting materials. These powders were mixed together in a steel vial and ball-milled in a SPEX mixer/mill machine. Samples were taken out after 11 hours of mixing when X-ray patterns showed that some amorphization had occurred. To examine the microstructure of these fine powders, three techniques were employed: (1) the suspension of powder particles on holey carbon film, (2) the epoxy-embedding for thin-sectioning technique, and (3) the microtome technique.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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