Reproducibility of the Synthesis and Processing of Nanostructured Material Properties
Tóm tắt
The reproducibility or variance in the properties of nanostructured milled iron and iron alloy powders and nanostructured compacts was determined and characterized. To date, all too often the characterization of nanostructured materials has been limited to examination of one or two samples, from which it is impossible to determine the reproducibility of the reported values. In this study, multiple attritor millings were made and the variability of the macroscopic and nanostructure characteristics was determined (e.g., particle size, grain size, etc.). From a single milled powder composition, multiple hot-press compacts were made. Statistical analyses were made of the reproducibility of resulting consolidated macroscopic and nanostructured properties, such as density, hardness, grain size, and tensile/compression strength. Mechanical processing of iron powder and mechanical alloying of iron powder with aluminum, carbon, and nitrogen showed that attrition milling reliably reproduced 0.5-kg lots of nanostructured powder. Hot-pressing the milled powder also produced reproducibility nanostructured compacts. There was little or no correlation found between the milled powder properties and the compacted powder properties. Several correlations that are generally valid for large grain materials were found not to hold for nanograin compacts (e.g., between density and hardness).
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