|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
||Grain Growth and Densification of Tungsten Nanopowders
||Brady G. Butler, James D. Paramore, Anthony J. Roberts, Jonathan P. Ligda, Micah Gallagher
|On-Site Speaker (Planned)
||Brady G. Butler
Bulk ultrafine grained materials exhibit unique material properties that are not achievable in their coarse grained counterparts. The synthesis of bulk ultrafine grained materials by powder metallurgical techniques requires a thorough understanding of the grain growth and densification behavior during sintering. Although several models have been developed to describe grain growth in bulk fully dense materials, these models are not sufficient to describe the growth behavior of nanograined compacts. Specifically, the early stages of sintering account for the most rapid growth regime, but this is generally not adequately described by existing grain growth models. This research utilizes high temperature x-ray diffraction to measure the growth behavior of ultrafine grained tungsten during the early stages of sintering to provide a comparison to conventional growth models. Finally, the kinetics of grain growth are evaluated in an effort to understand the active mechanisms during early stages of sintering.