|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Effect of Process Control Agents on Composition, Structure, and Properties of Mechanically Alloyed Powders
||R Sadangi, D Kapoor, T Zahrah
|On-Site Speaker (Planned)
There is a growing need to fabricate materials with homogeneous and fine grain structures to realize property and performance enhancements. One possible approach involves two enabling technologies: (a) mechanical alloying (MA) to synthesize variety of equilibrium or metastable structures, and (b) hot isostatic pressing to consolidate the materials with minimal grain coarsening.
MA involves repeated cold welding, fracturing, and re-welding of powder particles in a high-energy mill. During MA of ductile materials, an appropriate amount of process control agent (PCA) is often added to retain the equilibrium state between welding and fracturing processes. PCAs get uniformly distributed between layers during milling. Current practice of PCA removal involves degassing of the milled powder before consolidation. Influence of the degassing/PCA removal conditions on structure, composition and properties will be described with specific examples.