Strain Rate Sensitivity Studies of Cryomilled Al Alloy Performed by Nanoindentation

Byung Ahn; R. Mitra; A.M. Hodge; Enrique J. Lavernia; S.R. Nutt

doi:10.4028/www.scientific.net/MSF.584-586.221

Paper Titles

Comparative Possibilities of Different X-Ray Methods by Study of SPD Metal Materials
p.197

Mechanical Behavior of Nanocrystalline Palladium at High Strains and High Strain Rates
p.203

Chemical Sensitive Positron-Annihilation Study of Amorphization and Nanocrystallization Processes by Repeated Roll Bonding
p.209

Microstructure and Indentation Size-Effect in Pure Niobium Subjected to SPD via ECAP and HPT
p.215

Strain Rate Sensitivity Studies of Cryomilled Al Alloy Performed by Nanoindentation
p.221

Severe Plastic Deformation of Amorphous Alloys
p.227

Temperature Field in Severe Plastic Deformation at Small Strain Rates
p.231

Optical Strain Measurement on Small Specimens Based on Laser Speckles
p.237

Bond Strength of Ultrafine Grained Zr Fabricated by Accumulative Roll Bonding
p.243

HomeMaterials Science ForumMaterials Science Forum Vols. 584-586Strain Rate Sensitivity Studies of Cryomilled Al...

Strain Rate Sensitivity Studies of Cryomilled Al Alloy Performed by Nanoindentation

Abstract:

Al 5083 alloy powder was mechanically milled in liquid nitrogen to achieve a nanocrystalline (NC) structure having an average grain size of 50 nm with high thermal stability, and then consolidated by quasi-isostatic (QI) forging. The consolidation resulted in ultrafine grains (UFG) of about 250 nm, and the bulk material exhibited enhanced strength compared to conventionally processed Al 5083. The hardness of as-cryomilled powder and the UFG material was measured by nanoindentation using loading rates in the range of 50−50,000 /N/s, and results were compared with the conventional grain size alloy. Negative strain rate sensitivity was observed in the cryomilled NC powder and the forged UFG plate, while the conventional alloy was relatively strain rate insensitive.