|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Microstructure and Mechanical Properties of AA5083 Produced through Cryogenic Attrition and HIP
||Clara Hofmeister, Le Zhou, Frank Kellogg, Anit Giri, Tony Zahrah, Kyu Cho, Yongho Sohn
|On-Site Speaker (Planned)
Nanostructured aluminum has been shown to have exceptional mechanical advantage over conventional cast aluminum primarily through Hall-Petch strengthening. Retention of the nanocrystalline grain size is a challenge due to the several thermal and thermo-mechanical processes required for consolidation into a bulk part. The effect of degassing on the microstructure and mechanical properties were explored as a function of cryomilling time for hot isostatic pressed cryomilled AA5083 powders. Mechanical properties were assessed through a combination of tensile testing, Vickers Hardness and Nanoindentation. The microstructure of the consolidated powders was examined through optical and electron microscopy. Chemistry was determined through inert gas fusion thermal conductivity/infrared detection. Increasing the cryomilling time corresponded to increased oxygen and nitrogen impurity concentrations, decreased ultimate tensile strength (UTS) and increased hardness. After degassing, the oxygen and nitrogen concentrations were unaffected, the hydrogen concentration decreased, the UTS increased and the hardness decreased.